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Uşurelu CD, Frone AN, Oprică GM, Raduly MF, Ghiurea M, Neblea EI, Nicolae CA, Filip X, Teodorescu M, Panaitescu DM. Preparation and functionalization of cellulose nanofibers using a naturally occurring acid and their application in stabilizing linseed oil/water Pickering emulsions. Int J Biol Macromol 2024; 262:129884. [PMID: 38336328 DOI: 10.1016/j.ijbiomac.2024.129884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 01/25/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024]
Abstract
Finding efficient and environmental-friendly methods to produce and chemically modify cellulose nanofibers (CNFs) remains a challenge. In this study, lactic acid (LA) treatment followed by microfluidization was employed for the isolation and functionalization of CNFs. Small amounts of HCl (0.01, 0.1, and 0.2 M) were used alongside LA to intensify cellulose hydrolysis. FTIR spectroscopy and solid-state 13C NMR confirmed the successful functionalization of CNFs with lactyl groups during isolation, while SEM, AFM, and rheological tests revealed that the addition of HCl governed the fibers' sizes and morphology. Notably, the treatment with LA and 0.2 M HCl resulted in a more efficient defibrillation, yielding smaller nanofibers sizes (62 nm) as compared to the treatment with LA or HCl alone (90 and 108 nm, respectively). The aqueous suspension of CNFs treated with LA and 0.2 M HCl showed the highest viscosity and storage modulus. LA-modified CNFs were tested as stabilizers for linseed oil/water (50/50 v/v) emulsions. Owing to the lactyl groups grafted on their surface and higher aspect ratio, CNFs produced with 0.1 and 0.2 M HCl led to emulsions with increased stability (a creaming index increase of only 3 % and 1 %, respectively, in 30 days) and smaller droplets sizes of 23.4 ± 1.2 and 35.5 ± 0.5 μm, respectively. The results showed that LA-modified CNFs are promising stabilizers for Pickering emulsions.
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Affiliation(s)
- Cătălina-Diana Uşurelu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Adriana Nicoleta Frone
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania.
| | - Gabriela-Mădălina Oprică
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Monica Florentina Raduly
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Marius Ghiurea
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Elena Iulia Neblea
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Cristian-Andi Nicolae
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Xenia Filip
- National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donath Street, 400293 Cluj-Napoca, Romania
| | - Mircea Teodorescu
- Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Denis Mihaela Panaitescu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania.
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Oprică GM, Panaitescu DM, Lixandru BE, Uşurelu CD, Gabor AR, Nicolae CA, Fierascu RC, Frone AN. Plant-Derived Nanocellulose with Antibacterial Activity for Wound Healing Dressing. Pharmaceutics 2023; 15:2672. [PMID: 38140013 PMCID: PMC10747278 DOI: 10.3390/pharmaceutics15122672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/15/2023] [Accepted: 11/23/2023] [Indexed: 12/24/2023] Open
Abstract
The medical sector is one of the biggest consumers of single-use materials, and while the insurance of sterile media is non-negotiable, the environmental aspect is a chronic problem. Nanocellulose (NC) is one of the safest and most promising materials that can be used in medical applications due to its valuable properties like biocompatibility and biodegradability, along with its good mechanical properties and high water uptake capacity. However, NC has no bactericidal activity, which is a critical need for the effective prevention of infections in chronic diabetic wound dressing applications. Therefore, in this work, a natural product, propolis extract (PE), was used as an antibacterial agent, in different amounts, together with NC to obtain sponge-like structures (NC/PE). The scanning electron microscope (SEM) images showed well-impregnated cellulose fibers and a more compact structure with the addition of PE. According to the thermogravimetric analysis (TGA), the samples containing PE underwent thermal degradation before the unmodified NC due to the presence of volatile compounds in the extract. However, the peak degradation temperature in the first derivative thermogravimetric curves was higher for all the sponges containing PE when compared to the unmodified NC. The antibacterial efficacy of the samples was tested against Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli, as well as on two clinically resistant isolates. The samples completely inhibited the development of Staphylococcus aureus, and Pseudomonas aeruginosa was partially inhibited, while Escherichia coli was resistant to the PE action. Considering the physical and biological properties along with the environmental and economic benefits, the development of an NC/PE wound dressing seems promising.
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Affiliation(s)
- Gabriela Mădălina Oprică
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.O.); (C.D.U.); (A.R.G.); (C.-A.N.); (R.C.F.); (A.N.F.)
- Department of Science and Engineering of Oxide Materials and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Gh. PolizuStreet, 011061 Bucharest, Romania
| | - Denis Mihaela Panaitescu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.O.); (C.D.U.); (A.R.G.); (C.-A.N.); (R.C.F.); (A.N.F.)
| | - Brînduşa Elena Lixandru
- Cantacuzino National Medical-Military Institute for Research and Development, 103 Spl. Independentei, 050096 Bucharest, Romania;
| | - Catalina Diana Uşurelu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.O.); (C.D.U.); (A.R.G.); (C.-A.N.); (R.C.F.); (A.N.F.)
- Department of Bioresources and Polymer Science, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. PolizuStreet, 011061 Bucharest, Romania
| | - Augusta Raluca Gabor
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.O.); (C.D.U.); (A.R.G.); (C.-A.N.); (R.C.F.); (A.N.F.)
| | - Cristian-Andi Nicolae
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.O.); (C.D.U.); (A.R.G.); (C.-A.N.); (R.C.F.); (A.N.F.)
| | - Radu Claudiu Fierascu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.O.); (C.D.U.); (A.R.G.); (C.-A.N.); (R.C.F.); (A.N.F.)
- Department of Science and Engineering of Oxide Materials and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Gh. PolizuStreet, 011061 Bucharest, Romania
| | - Adriana Nicoleta Frone
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.O.); (C.D.U.); (A.R.G.); (C.-A.N.); (R.C.F.); (A.N.F.)
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Oprică GM, Panaitescu DM, Usurelu CD, Vlăsceanu GM, Stanescu PO, Lixandru BE, Vasile V, Gabor AR, Nicolae CA, Ghiurea M, Frone AN. Nanocellulose Sponges Containing Antibacterial Basil Extract. Int J Mol Sci 2023; 24:11871. [PMID: 37511630 PMCID: PMC10380770 DOI: 10.3390/ijms241411871] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/18/2023] [Accepted: 07/21/2023] [Indexed: 07/30/2023] Open
Abstract
Nanocellulose (NC) is a valuable material in tissue engineering, wound dressing, and drug delivery, but its lack of antimicrobial activity is a major drawback for these applications. In this work, basil ethanolic extract (BE) and basil seed mucilage (BSM) were used to endow nanocellulose with antibacterial activity. NC/BE and NC/BE/BSM sponges were obtained from nanocellulose suspensions and different amounts of BE and BSM after freeze-drying. Regardless of the BE or BSM content, the sponges started to decompose at a lower temperature due to the presence of highly volatile active compounds in BE. A SEM investigation revealed an opened-cell structure and nanofibrillar morphology for all the sponges, while highly impregnated nanofibers were observed by SEM in NC/BE sponges with higher amounts of BE. A quantitative evaluation of the porous morphology by microcomputer tomography showed that the open porosity of the sponges varied between 70% and 82%, being lower in the sponges with higher BE/BSM content due to the impregnation of cellulose nanofibers with BE/BSM, which led to smaller pores. The addition of BE increased the specific compression strength of the NC/BE sponges, with a higher amount of BE having a stronger effect. A slight inhibition of S. aureus growth was observed in the NC/BE sponges with a higher amount of BE, and no effect was observed in the unmodified NC. In addition, the NC/BE sponge with the highest amount of BE and the best antibacterial effect in the series showed no cytotoxic effect and did not interfere with the normal development of the L929 cell line, similar to the unmodified NC. This work uses a simple, straightforward method to obtain highly porous nanocellulose structures containing antibacterial basil extract for use in biomedical applications.
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Affiliation(s)
- Gabriela Mădălina Oprică
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Denis Mihaela Panaitescu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Catalina Diana Usurelu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnology, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - George Mihai Vlăsceanu
- Faculty of Chemical Engineering and Biotechnology, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Paul Octavian Stanescu
- Faculty of Chemical Engineering and Biotechnology, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Brandusa Elena Lixandru
- Cantacuzino National Medical-Military Institute for Research and Development, 103 Spl. Independentei, 050096 Bucharest, Romania
| | - Valentin Vasile
- Cantacuzino National Medical-Military Institute for Research and Development, 103 Spl. Independentei, 050096 Bucharest, Romania
| | - Augusta Raluca Gabor
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Cristian-Andi Nicolae
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Marius Ghiurea
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Adriana Nicoleta Frone
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
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Panaitescu DM, Frone AN, Nicolae CA, Gabor AR, Miu DM, Soare MG, Vasile BS, Lupescu I. Poly(3-hydroxybutyrate) nanocomposites modified with even and odd chain length polyhydroxyalkanoates. Int J Biol Macromol 2023:125324. [PMID: 37307975 DOI: 10.1016/j.ijbiomac.2023.125324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 05/17/2023] [Accepted: 06/08/2023] [Indexed: 06/14/2023]
Abstract
Poly(3-hydroxybutyrate) (PHB) was blended with medium-chain-length PHAs (mcl-PHAs) for improving its flexibility while nanocellulose (NC) was added as a reinforcing agent. Even and odd-chain-length PHAs, having as main component poly(3-hydroxyoctanoate) (PHO) or poly(3-hydroxynonanoate) (PHN) were synthesized and served as PHB modifiers. The effects of PHO and PHN on the morphology, thermal, mechanical and biodegradation behaviors of PHB were different, especially in the presence of NC. The addition of mcl-PHAs decreased the storage modulus (E') of PHB blends by about 40 %. The further addition of NC mitigated this decrease bringing the E' of PHB/PHO/NC close to that of PHB and having a minor effect on the E' of PHB/PHN/NC. The biodegradability of PHB/PHN/NC was higher than that of PHB/PHO/NC, the latter's being close to that of neat PHB after soil burial for four months. The results showed a complex effect of NC, which enhanced the interaction between PHB and mcl-PHAs and decreased the size of PHO/PHN inclusions (1.9 ± 0.8/2.6 ± 0.9 μm) while increasing the accessibility of water and microorganisms during soil burial. The blown film extrusion test showed the ability of mcl-PHA and NC modified PHB to stretch forming uniform tube and supports the application of these biomaterials in the packaging sector.
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Affiliation(s)
- Denis Mihaela Panaitescu
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania.
| | - Adriana Nicoleta Frone
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania.
| | - Cristian-Andi Nicolae
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Augusta Raluca Gabor
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Dana Maria Miu
- National Institute for Chemical Pharmaceutical Research and Development, 112 Calea Vitan, 031299 Bucharest, Romania
| | - Mariana-Gratiela Soare
- National Institute for Chemical Pharmaceutical Research and Development, 112 Calea Vitan, 031299 Bucharest, Romania
| | - Bogdan Stefan Vasile
- National Research Centre for Micro and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania
| | - Irina Lupescu
- National Institute for Chemical Pharmaceutical Research and Development, 112 Calea Vitan, 031299 Bucharest, Romania; Department of Veterinary Medicine, Spiru Haret University, 256 Bulevardul Basarabia, 030352 Bucharest, Romania
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Panaitescu DM, Frone AN. Cellulose (Nano)Composites. Polymers (Basel) 2023; 15:polym15112512. [PMID: 37299311 DOI: 10.3390/polym15112512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 05/25/2023] [Accepted: 05/26/2023] [Indexed: 06/12/2023] Open
Abstract
The environment has been severely affected by the intensive production and use of plastics derived from fossil fuels, and their uncontrolled end-of-life disposal [...].
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Affiliation(s)
- Denis Mihaela Panaitescu
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Adriana Nicoleta Frone
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania
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Frone AN, Uşurelu CD, Oprică GM, Panaitescu DM, Gabor AR, Nicolae CA, Ciuprina F, Damian CM, Raduly FM. Contribution of the Surface Treatment of Nanofibrillated Cellulose on the Properties of Bio-Based Epoxy Nanocomposites Intended for Flexible Electronics. Int J Mol Sci 2023; 24:ijms24076544. [PMID: 37047517 PMCID: PMC10095063 DOI: 10.3390/ijms24076544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 03/24/2023] [Accepted: 03/28/2023] [Indexed: 04/03/2023] Open
Abstract
The growing interest in materials derived from biomass has generated a multitude of solutions for the development of new sustainable materials with low environmental impact. We report here, for the first time, a strategy to obtain bio-based nanocomposites from epoxidized linseed oil (ELO), itaconic acid (IA), and surface-treated nanofibrillated cellulose (NC). The effect of nanofibrillated cellulose functionalized with silane (NC/S) and then grafted with methacrylic acid (NC/SM) on the properties of the resulted bio-based epoxy systems was thoroughly investigated. The differential scanning calorimetry (DSC) results showed that the addition of NCs did not influence the curing process and had a slight impact on the maximum peak temperature. Moreover, the NCs improved the onset degradation temperature of the epoxy-based nanocomposites by more than 30 °C, regardless of their treatment. The most important effect on the mechanical properties of bio-based epoxy nanocomposites, i.e., an increase in the storage modulus by more than 60% at room temperature was observed in the case of NC/SM addition. Therefore, NC’s treatment with silane and methacrylic acid improved the epoxy–nanofiber interface and led to a very good dispersion of the NC/SM in the epoxy network, as observed by the SEM investigation. The dielectric results proved the suitability of the obtained bio-based epoxy/NCs materials as substitutes for petroleum-based thermosets in the fabrication of flexible electronic devices.
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Affiliation(s)
- Adriana Nicoleta Frone
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.D.U.); (G.M.O.); (D.M.P.); (A.R.G.); (C.-A.N.)
- Correspondence:
| | - Cătălina Diana Uşurelu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.D.U.); (G.M.O.); (D.M.P.); (A.R.G.); (C.-A.N.)
| | - Gabriela Mădălina Oprică
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.D.U.); (G.M.O.); (D.M.P.); (A.R.G.); (C.-A.N.)
| | - Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.D.U.); (G.M.O.); (D.M.P.); (A.R.G.); (C.-A.N.)
| | - Augusta Raluca Gabor
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.D.U.); (G.M.O.); (D.M.P.); (A.R.G.); (C.-A.N.)
| | - Cristian-Andi Nicolae
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.D.U.); (G.M.O.); (D.M.P.); (A.R.G.); (C.-A.N.)
| | - Florin Ciuprina
- ELMAT Laboratory, Faculty of Electrical Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania;
| | - Celina Maria Damian
- Advanced Polymer Materials Group, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania;
| | - Florentina Monica Raduly
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.D.U.); (G.M.O.); (D.M.P.); (A.R.G.); (C.-A.N.)
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Ciuprina F, Panaitescu DM, Enache L, Damian CM, Grigorescu RM, Gabor AR, Nicolae CA, Nistor CL, Trusca R. Control of Dielectric and Mechanical Properties of Styrenic Block Copolymer by Graphite Incorporation. Materials (Basel) 2022; 15:7577. [PMID: 36363186 PMCID: PMC9658140 DOI: 10.3390/ma15217577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 10/19/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
The structure-property relationship of dielectric elastomers, as well as the methods of improving the control of this relationship, has been widely studied over the last few years, including in some of our previous works. In this paper, we study the control, improvement, and correlation, for a significant range of temperatures, of the mechanical and dielectric properties of polystyrene-b-(ethylene-co-butylene)-b-styrene (SEBS) and maleic-anhydride-grafted SEBS (SEBS-MA) by using graphite (G) as filler in various concentrations. The aim is to analyze the suitability of these composites for converting electrical energy into mechanical energy or vice versa. The dielectric spectroscopy analysis performed in the frequency range of 10 to 1 MHz and at temperatures between 27 and 77 °C emphasized an exponential increase in real permittivity with G concentration, a low level of dielectric losses (≈10-3), as well as the stability of dielectric losses with temperature for high G content. These results correlate well with the increase in mechanical stiffness with an increase in G content for both SEBS/G and SEBS-MA/G composites. The activation energies for the dielectric relaxation processes detected in SEBS/G and SEBS-MA/G composites were also determined and discussed in connection with the mechanical, thermal, and structural properties resulting from thermogravimetric analysis, differential scanning calorimetry, Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses.
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Affiliation(s)
- Florin Ciuprina
- ELMAT Laboratory, Faculty of Electrical Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Laura Enache
- ELMAT Laboratory, Faculty of Electrical Engineering, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Celina Maria Damian
- Advanced Polymer Materials Group, University Politehnica of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Ramona Marina Grigorescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Augusta Raluca Gabor
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Cristian Andi Nicolae
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Cristina Lavinia Nistor
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Roxana Trusca
- Department of Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania
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Frone AN, Popa MS, Uşurelu CD, Panaitescu DM, Gabor AR, Nicolae CA, Raduly MF, Zaharia A, Alexandrescu E. Bio-Based Poly(lactic acid)/Poly(butylene sebacate) Blends with Improved Toughness. Polymers (Basel) 2022; 14:polym14193998. [PMID: 36235947 PMCID: PMC9572606 DOI: 10.3390/polym14193998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 09/19/2022] [Accepted: 09/20/2022] [Indexed: 11/16/2022] Open
Abstract
A series of poly(butylene sebacate) (PBSe) aliphatic polyesters were successfully synthesized by the melt polycondensation of sebacic acid (Se) and 1,4-butanediol (BDO), two monomers manufactured on an industrial scale from biomass. The number average molecular weight (Mn) in the range from 6116 to 10,779 g/mol and the glass transition temperature (Tg) of the PBSe polyesters were tuned by adjusting the feed ratio between the two monomers. Polylactic acid (PLA)/PBSe blends with PBSe concentrations between 2.5 to 20 wt% were obtained by melt compounding. For the first time, PBSe’s effect on the flexibility and toughness of PLA was studied. As shown by the torque and melt flow index (MFI) values, the addition of PBSe endowed PLA with both enhanced melt processability and flexibility. The tensile tests and thermogravimetric analysis showed that PLA/PBSe blends containing 20 wt% PBSe obtained using a BDO molar excess of 50% reached an increase in elongation at break from 2.9 to 108%, with a negligible decrease in Young’s modulus from 2186 MPa to 1843 MPa, and a slight decrease in thermal performances. These results demonstrated the plasticizing efficiency of the synthesized bio-derived polyesters in overcoming PLA’s brittleness. Moreover, the tunable properties of the resulting PBSe can be of great industrial interest in the context of circular bioeconomy.
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Panaitescu DM, Stoian S, Frone AN, Vlăsceanu GM, Baciu DD, Gabor AR, Nicolae CA, Radiţoiu V, Alexandrescu E, Căşărică A, Damian C, Stanescu P. Nanofibrous scaffolds based on bacterial cellulose crosslinked with oxidized sucrose. Int J Biol Macromol 2022; 221:381-397. [PMID: 36058396 DOI: 10.1016/j.ijbiomac.2022.08.189] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 08/24/2022] [Accepted: 08/30/2022] [Indexed: 11/30/2022]
Abstract
In this work, oxidized sucrose (OS), which is a safe bio-based and non-toxic polyaldehyde, was used as a crosslinker in defibrillated bacterial cellulose (BC) sponges obtained by freeze-drying. For mimicking the proteins' crosslinking, BC was first modified with an aminosilane to partially replace the OH groups on the BC surface with more reactive amino groups. Further, the aminosilane-grafted bacterial cellulose (BCA) was crosslinked with OS in different concentrations and thermally cured. Functionalized bacterial celluloses showed a good thermal stability, comparable to that of unmodified cellulose and much improved mechanical properties. A threefold increase in the compression strength was obtained for the BCA scaffold after crosslinking and curing. This was correlated with the uniform pore structure emphasized by the micro-CT and SEM analyses. The OS-crosslinked BCA scaffolds were not cytotoxic and showed a porosity of around 80 %, which was almost 100 % open porosity. This study shows that the crosslinking of aminated BC scaffolds with OS allows the obtaining of 3D cellulose structures with good mechanical properties and high porosity, suitable for soft tissue engineering. The results recommend this new method as an innovative approach to obtaining biomaterial scaffolds that mimic the natural extracellular matrix.
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Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Sergiu Stoian
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Adriana Nicoleta Frone
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | | | - Dora Domnica Baciu
- Cantacuzino National Medical-Military Institute for Research and Development, 103 Spl. Independentei, 050096 Bucharest, Romania
| | - Augusta Raluca Gabor
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Cristian Andi Nicolae
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Valentin Radiţoiu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Elvira Alexandrescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania
| | - Angela Căşărică
- National Institute for Chemical - Pharmaceutical Research and Development, 112 Calea Vitan, 031299 Bucharest, Romania
| | - Celina Damian
- University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Paul Stanescu
- University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
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10
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Popa MS, Frone AN, Panaitescu DM. Polyhydroxybutyrate blends: A solution for biodegradable packaging? Int J Biol Macromol 2022; 207:263-277. [PMID: 35257732 DOI: 10.1016/j.ijbiomac.2022.02.185] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/23/2022] [Accepted: 02/27/2022] [Indexed: 11/05/2022]
Abstract
Poly (3-hydroxybutyrate) (PHB) is a valuable bio-based and biodegradable polymer that may substitute common polymers in packaging and biomedical applications provided that the production cost is reduced and some properties improved. Blending PHB with other biodegradable polymers is the most simple and accessible route to reduce costs and to improve properties. This review provides a comprehensive overview on the preparation, properties and application of the PHB blends with other biodegradable polyesters such as medium-chain-length polyhydroxyalkanoates, poly(ε-caprolactone), poly(lactic acid), poly(butylene succinate), poly(propylene carbonate) and poly (butylene adipate-co-terephthalate) or polysaccharides and their derivatives. A special attention has been paid to the miscibility of PHB with these polymers and the compatibilizing methods used to improve the dispersion and interface. The changes in the PHB morphology, thermal, mechanical and barrier properties induced by the second polymer have been critically analyzed in view of industrial application. The biodegradability and recyclability strategies of the PHB blends were summarized along with the processing techniques adapted to the intended application. This review provides the tools for a better understanding of the relation between the micro/nanostructure of PHB blends and their properties for the further development of PHB blends as solutions for biodegradable packaging.
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Affiliation(s)
- Marius Stelian Popa
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest 060021, Romania
| | - Adriana Nicoleta Frone
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest 060021, Romania
| | - Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest 060021, Romania.
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11
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Usurelu CD, Badila S, Frone AN, Panaitescu DM. Poly(3-hydroxybutyrate) Nanocomposites with Cellulose Nanocrystals. Polymers (Basel) 2022; 14:polym14101974. [PMID: 35631856 PMCID: PMC9144865 DOI: 10.3390/polym14101974] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 05/09/2022] [Accepted: 05/10/2022] [Indexed: 01/14/2023] Open
Abstract
Poly(3-hydroxybutyrate) (PHB) is one of the most promising substitutes for the petroleum-based polymers used in the packaging and biomedical fields due to its biodegradability, biocompatibility, good stiffness, and strength, along with its good gas-barrier properties. One route to overcome some of the PHB’s weaknesses, such as its slow crystallization, brittleness, modest thermal stability, and low melt strength is the addition of cellulose nanocrystals (CNCs) and the production of PHB/CNCs nanocomposites. Choosing the adequate processing technology for the fabrication of the PHB/CNCs nanocomposites and a suitable surface treatment for the CNCs are key factors in obtaining a good interfacial adhesion, superior thermal stability, and mechanical performances for the resulting nanocomposites. The information provided in this review related to the preparation routes, thermal, mechanical, and barrier properties of the PHB/CNCs nanocomposites may represent a starting point in finding new strategies to reduce the manufacturing costs or to design better technological solutions for the production of these materials at industrial scale. It is outlined in this review that the use of low-value biomass resources in the obtaining of both PHB and CNCs might be a safe track for a circular and bio-based economy. Undoubtedly, the PHB/CNCs nanocomposites will be an important part of a greener future in terms of successful replacement of the conventional plastic materials in many engineering and biomedical applications.
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12
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Radu ER, Panaitescu DM, Andrei L, Ciuprina F, Nicolae CA, Gabor AR, Truşcă R. Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices. Nanomaterials (Basel) 2021; 12:nano12010095. [PMID: 35010043 PMCID: PMC8746963 DOI: 10.3390/nano12010095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 12/15/2021] [Accepted: 12/23/2021] [Indexed: 11/16/2022]
Abstract
Polymer nanodielectrics characterized by good flexibility, processability, low dielectric loss and high dielectric permittivity are materials of interest for wearable electronic devices and intelligent textiles, and are highly in demand in robotics. In this study, an easily scalable and environmentally friendly method was applied to obtain polysiloxane/nanosilica nanocomposites with a large content of nanofiller, of up to 30% by weight. Nanosilica was dispersed both as individual particles and as agglomerates; in nanocomposites with a lower amount of filler, the former prevailed, and at over 20 wt% nanosilica the agglomerates predominated. An improvement of both the tensile strength and modulus was observed for nanocomposites with 5–15 wt% nanosilica, and a strong increase of the storage modulus was observed with the increase of nanofiller concentration. Furthermore, an increase of the storage modulus of up to seven times was observed in the nanocomposites with 30 wt% nanosilica. The tensile modulus was well fitted by models that consider the aggregation of nanoparticles and the role of the interface. The dielectric spectra showed an increase of the real part of the complex relative permittivity with 33% for 30 wt% nanosilica in nanocomposites at a frequency of 1 KHz, whereas the loss tangent values were lower than 0.02 for all tested nanodielectrics in the radio frequency range between 1 KHz and 1 MHz. The polysiloxane–nanosilica nanocomposites developed in this work showed good flexibility; however, they also showed increased stiffness along with a stronger dielectric response than the unfilled polysiloxane, which recommends them as dielectric substrates for wearable electronic devices.
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Affiliation(s)
- Elena Ruxandra Radu
- National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Spl. Indendentei, 060021 Bucharest, Romania; (E.R.R.); (C.A.N.); (A.R.G.)
| | - Denis Mihaela Panaitescu
- National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Spl. Indendentei, 060021 Bucharest, Romania; (E.R.R.); (C.A.N.); (A.R.G.)
- Correspondence: (D.M.P.); (F.C.)
| | - Laura Andrei
- ELMAT Laboratory, Faculty of Electrical Engineering, University Politehnica of Bucharest, 313 Spl. Indendentei, 060042 Bucharest, Romania;
| | - Florin Ciuprina
- ELMAT Laboratory, Faculty of Electrical Engineering, University Politehnica of Bucharest, 313 Spl. Indendentei, 060042 Bucharest, Romania;
- Correspondence: (D.M.P.); (F.C.)
| | - Cristian Andi Nicolae
- National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Spl. Indendentei, 060021 Bucharest, Romania; (E.R.R.); (C.A.N.); (A.R.G.)
| | - Augusta Raluca Gabor
- National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Spl. Indendentei, 060021 Bucharest, Romania; (E.R.R.); (C.A.N.); (A.R.G.)
| | - Roxana Truşcă
- National Research Centre for Micro and Nanomaterials, University Politehnica of Bucharest, 313 Spl. Indendentei, 060042 Bucharest, Romania;
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13
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Popa MS, Frone AN, Radu IC, Stanescu PO, Truşcă R, Rădiţoiu V, Nicolae CA, Gabor AR, Panaitescu DM. Microfibrillated Cellulose Grafted with Metacrylic Acid as a Modifier in Poly(3-hydroxybutyrate). Polymers (Basel) 2021; 13:polym13223970. [PMID: 34833269 PMCID: PMC8624960 DOI: 10.3390/polym13223970] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 11/13/2021] [Accepted: 11/15/2021] [Indexed: 11/18/2022] Open
Abstract
This work proposes a new method for obtaining poly(3-hydroxybutyrate) (PHB)/microfibrillated cellulose (MC) composites with more balanced properties intended for the substitution of petroleum-based polymers in packaging and engineering applications. To achieve this, the MC surface was adjusted by a new chemical route to enhance its compatibility with the PHB matrix: (i) creating active sites on the surface of MC with γ-methacryloxypropyltrimethoxysilane (SIMA) or vinyltriethoxysilane (SIV), followed by (ii) the graft polymerization of methacrylic acid (MA). The high efficiency of the SIMA-MA treatment and the lower efficiency in the case of SIV-MA were proven by the changes observed in the Fourier transform infrared FTIR spectra of celluloses. All modified celluloses and the PHB composites containing them showed good thermal stability close to the processing temperature of PHB. SIMA-modified celluloses acted as nucleating agents in PHB, increasing its crystallinity and favoring the formation of smaller spherulites. A uniform dispersion of SIMA-modified celluloses in PHB as a result of the good compatibility between the two phases was observed by scanning electron microscopy and many agglomerations of fibers in the composite with unmodified MC. The dual role of SIMA-MA treatment, as both compatibilizer and plasticizer, was pointed out by mechanical and rheological measurements. This new method to modify MC and obtain PHB/MC composites with more balanced stiffness–toughness properties could be a solution to the high brittleness and poor processability of PHB-based materials.
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Affiliation(s)
- Marius Stelian Popa
- Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 202 SplaiulIndependentei, 060021 Bucharest, Romania; (M.S.P.); (A.N.F.); (V.R.); (C.A.N.); (A.R.G.)
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania; (I.C.R.); (P.O.S.)
| | - Adriana Nicoleta Frone
- Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 202 SplaiulIndependentei, 060021 Bucharest, Romania; (M.S.P.); (A.N.F.); (V.R.); (C.A.N.); (A.R.G.)
| | - Ionut Cristian Radu
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania; (I.C.R.); (P.O.S.)
| | - Paul Octavian Stanescu
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania; (I.C.R.); (P.O.S.)
| | - Roxana Truşcă
- National Research Centre for Micro and Nanomaterials, University Politehnica of Bucharest, 313 Spl. Indendentei, 060042 Bucharest, Romania;
| | - Valentin Rădiţoiu
- Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 202 SplaiulIndependentei, 060021 Bucharest, Romania; (M.S.P.); (A.N.F.); (V.R.); (C.A.N.); (A.R.G.)
| | - Cristian Andi Nicolae
- Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 202 SplaiulIndependentei, 060021 Bucharest, Romania; (M.S.P.); (A.N.F.); (V.R.); (C.A.N.); (A.R.G.)
| | - Augusta Raluca Gabor
- Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 202 SplaiulIndependentei, 060021 Bucharest, Romania; (M.S.P.); (A.N.F.); (V.R.); (C.A.N.); (A.R.G.)
| | - Denis Mihaela Panaitescu
- Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 202 SplaiulIndependentei, 060021 Bucharest, Romania; (M.S.P.); (A.N.F.); (V.R.); (C.A.N.); (A.R.G.)
- Correspondence:
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14
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Panaitescu DM, Popa MS, Raditoiu V, Frone AN, Sacarescu L, Gabor AR, Nicolae CA, Teodorescu M. Effect of calcium stearate as a lubricant and catalyst on the thermal degradation of poly(3-hydroxybutyrate). Int J Biol Macromol 2021; 190:780-791. [PMID: 34517031 DOI: 10.1016/j.ijbiomac.2021.09.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/19/2021] [Accepted: 09/06/2021] [Indexed: 10/20/2022]
Abstract
Poly(3-hydroxybutyrate) (PHB) is a promising substitute to petroleum-based polymers in packaging and biomedical applications provided that its melt processability and degradability are improved. A new method to control the properties of PHB by using cheap calcium stearate (CS) as a lubricant and decomposition catalyst in melt-mixed PHB-CS compounds was first used. CS is composed of a metallic cation, which promotes PHB degradation, and a hydrophobic anion that improves the compatibility with PHB and processability. An environmentally friendly melt mixing technique was employed to obtain the PHB-CS compounds. Incorporation of 0.5 or 5 wt% CS reduced the melt viscosity and molecular weight of PHB, decreased the melting temperature with up to 5 °C, the crystallization temperature with more than 25 °C, and the degradation temperature with 15 and 40 °C, respectively. In small amounts (0.05 wt%), CS improved the processability and mechanical properties of PHB. In higher amount (0.5 wt%), CS slightly improved the Young's modulus, reduced the tensile strength and enhanced degradation. A better control of thermal and mechanical properties of PHB is, thus, possible by using different CS amount and processing conditions. These results are relevant for PHB application in the context of the global transition to biodegradable packaging.
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Affiliation(s)
- Denis Mihaela Panaitescu
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021, Bucharest, Romania.
| | - Marius Stelian Popa
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021, Bucharest, Romania; Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania
| | - Valentin Raditoiu
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021, Bucharest, Romania
| | - Adriana Nicoleta Frone
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021, Bucharest, Romania
| | - Liviu Sacarescu
- Romanian Academy, Petru Poni Institute of Macromolecular Chemistry, 41 A Gr. Ghica Voda Alley, 700487, Iasi, Romania
| | - Augusta Raluca Gabor
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021, Bucharest, Romania
| | - Cristian Andi Nicolae
- National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, 202 Splaiul Independentei, 060021, Bucharest, Romania.
| | - Mircea Teodorescu
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania
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15
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Vuluga Z, Sanporean CG, Panaitescu DM, Teodorescu GM, Corobea MC, Nicolae CA, Gabor AR, Raditoiu V. The Effect of SEBS/Halloysite Masterbatch Obtained in Different Extrusion Conditions on the Properties of Hybrid Polypropylene/Glass Fiber Composites for Auto Parts. Polymers (Basel) 2021; 13:polym13203560. [PMID: 34685321 PMCID: PMC8541571 DOI: 10.3390/polym13203560] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 10/10/2021] [Accepted: 10/12/2021] [Indexed: 11/25/2022] Open
Abstract
Masterbatches from a linear poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) and halloysite nanotubes (HNT-QM) were obtained in different conditions of temperature and shear using two co-rotating twin-screw extruders. The influence of screw configuration and melt processing conditions on the morpho-structural, thermal and mechanical properties of masterbatches at macro and nanoscale was studied. A good dispersion of halloysite nanotubes and better thermal stability and tensile and nanomechanical properties were obtained at a lower temperature profile and higher screw speed. The effect of masterbatches, the best and worst alternatives, on the properties of a polypropylene (PP)–glass fiber (GF) composite was also evaluated. Double hardness, tensile strength and modulus and four times higher impact strength were obtained for PP/GF composites containing masterbatches compared to pristine PP. However, the masterbatch with the best properties led further to enhanced mechanical properties of the PP/GF composite. A clear difference between the effects of the two masterbatches was obtained by nanoindentation and nanoscratch tests. These analyses proved to be useful for the design of polymer composites for automotive parts, such as bumpers or door panels. This study demonstrated that setting-up the correct processing conditions is very important to obtain the desired properties for automotive applications.
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Affiliation(s)
- Zina Vuluga
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.T.); (M.C.C.); (C.A.N.); (A.R.G.); (V.R.)
- Correspondence: (Z.V.); (D.M.P.); Tel.: +40-21-316-3068 (Z.V. & D.M.P.)
| | - Catalina-Gabriela Sanporean
- Department of Materials and Production, Aalborg University, Fibigerstraede 16, DK-9220 Aalborg East, Denmark;
| | - Denis Mihaela Panaitescu
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.T.); (M.C.C.); (C.A.N.); (A.R.G.); (V.R.)
- Correspondence: (Z.V.); (D.M.P.); Tel.: +40-21-316-3068 (Z.V. & D.M.P.)
| | - George Mihail Teodorescu
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.T.); (M.C.C.); (C.A.N.); (A.R.G.); (V.R.)
| | - Mihai Cosmin Corobea
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.T.); (M.C.C.); (C.A.N.); (A.R.G.); (V.R.)
| | - Cristian Andi Nicolae
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.T.); (M.C.C.); (C.A.N.); (A.R.G.); (V.R.)
| | - Augusta Raluca Gabor
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.T.); (M.C.C.); (C.A.N.); (A.R.G.); (V.R.)
| | - Valentin Raditoiu
- National Institute for Research and Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania; (G.M.T.); (M.C.C.); (C.A.N.); (A.R.G.); (V.R.)
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16
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Panaitescu DM, Nicolae CA, Melinte V, Scutaru AL, Gabor AR, Popa MS, Oprea M, Buruiana T. Influence of microfibrillated cellulose and soft biocomponent on the morphology and thermal properties of thermoplastic polyurethanes. J Appl Polym Sci 2021. [DOI: 10.1002/app.50951] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Denis Mihaela Panaitescu
- Polymers Department National Institute for Research and Development in Chemistry and Petrochemistry ICECHIM Bucharest Romania
| | - Cristian Andi Nicolae
- Polymers Department National Institute for Research and Development in Chemistry and Petrochemistry ICECHIM Bucharest Romania
| | - Violeta Melinte
- Polyaddition and Photochemistry Department Petru Poni Institute of Macromolecular Chemistry Iasi Romania
| | - Andreea Laura Scutaru
- Polyaddition and Photochemistry Department Petru Poni Institute of Macromolecular Chemistry Iasi Romania
| | - Augusta Raluca Gabor
- Polymers Department National Institute for Research and Development in Chemistry and Petrochemistry ICECHIM Bucharest Romania
| | - Marius Stelian Popa
- Polymers Department National Institute for Research and Development in Chemistry and Petrochemistry ICECHIM Bucharest Romania
| | - Madalina Oprea
- Polymers Department National Institute for Research and Development in Chemistry and Petrochemistry ICECHIM Bucharest Romania
| | - Tinca Buruiana
- Polyaddition and Photochemistry Department Petru Poni Institute of Macromolecular Chemistry Iasi Romania
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17
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Frone AN, Nicolae CA, Eremia MC, Tofan V, Ghiurea M, Chiulan I, Radu E, Damian CM, Panaitescu DM. Low Molecular Weight and Polymeric Modifiers as Toughening Agents in Poly(3-Hydroxybutyrate) Films. Polymers (Basel) 2020; 12:E2446. [PMID: 33105812 PMCID: PMC7716241 DOI: 10.3390/polym12112446] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/20/2020] [Accepted: 10/20/2020] [Indexed: 01/10/2023] Open
Abstract
The inherent brittleness of poly(3-hydroxybutyrate) (PHB) prevents its use as a substitute of petroleum-based polymers. Low molecular weight plasticizers, such as tributyl 2-acetyl citrate (TAC), cannot properly solve this issue. Herein, PHB films were obtained using a biosynthesized poly(3-hydroxyoctanoate) (PHO) and a commercially available TAC as toughening agents. The use of TAC strongly decreased the PHB thermal stability up to 200 °C due to the loss of low boiling point plasticizer, while minor weight loss was noticed at this temperature for the PHB-PHO blend. Both agents shifted the glass transition temperature of PHB to a lower temperature, the effect being more pronounced for TAC. The elongation at break of PHB increased by 700% after PHO addition and by only 185% in the case of TAC; this demonstrates an important toughening effect of the polymeric modifier. Migration of TAC to the upper surface of the films and no sign of migration in the case of PHO were highlighted by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) results. In vitro biocompatibility tests showed that all the PHB films are non-toxic towards L929 cells and have no proinflammatory immune response. The use of PHO as a toughening agent in PHB represents an attractive solution to its brittleness in the case of packaging and biomedical applications while conserving its biodegradability and biocompatibility.
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Affiliation(s)
- Adriana Nicoleta Frone
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.A.N.); (M.G.); (I.C.); (E.R.)
| | - Cristian Andi Nicolae
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.A.N.); (M.G.); (I.C.); (E.R.)
| | - Mihaela Carmen Eremia
- National Institute for Chemical Pharmaceutical Research and Development ICCF, 112 Calea Vitan, 031299 Bucharest, Romania;
| | - Vlad Tofan
- Cantacuzino National Institute of R&D for Microbiology and Immunology, 103 Splaiul Independentei, 050096 Bucharest, Romania;
| | - Marius Ghiurea
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.A.N.); (M.G.); (I.C.); (E.R.)
| | - Ioana Chiulan
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.A.N.); (M.G.); (I.C.); (E.R.)
| | - Elena Radu
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.A.N.); (M.G.); (I.C.); (E.R.)
| | - Celina Maria Damian
- Advanced Polymer Materials Group, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gheorghe Polizu, 011061 Bucharest, Romania;
| | - Denis Mihaela Panaitescu
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (C.A.N.); (M.G.); (I.C.); (E.R.)
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Oprea M, Panaitescu DM. Nanocellulose Hybrids with Metal Oxides Nanoparticles for Biomedical Applications. Molecules 2020; 25:E4045. [PMID: 32899710 PMCID: PMC7570792 DOI: 10.3390/molecules25184045] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 08/31/2020] [Accepted: 09/02/2020] [Indexed: 12/13/2022] Open
Abstract
Cellulose is one of the most affordable, sustainable and renewable resources, and has attracted much attention especially in the form of nanocellulose. Bacterial cellulose, cellulose nanocrystals or nanofibers may serve as a polymer support to enhance the effectiveness of metal nanoparticles. The resultant hybrids are valuable materials for biomedical applications due to the novel optical, electronic, magnetic and antibacterial properties. In the present review, the preparation methods, properties and application of nanocellulose hybrids with different metal oxides nanoparticles such as zinc oxide, titanium dioxide, copper oxide, magnesium oxide or magnetite are thoroughly discussed. Nanocellulose-metal oxides antibacterial formulations are preferred to antibiotics due to the lack of microbial resistance, which is the main cause for the antibiotics failure to cure infections. Metal oxide nanoparticles may be separately synthesized and added to nanocellulose (ex situ processes) or they can be synthesized using nanocellulose as a template (in situ processes). In the latter case, the precursor is trapped inside the nanocellulose network and then reduced to the metal oxide. The influence of the synthesis methods and conditions on the thermal and mechanical properties, along with the bactericidal and cytotoxicity responses of nanocellulose-metal oxides hybrids were mainly analyzed in this review. The current status of research in the field and future perspectives were also signaled.
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Affiliation(s)
- Madalina Oprea
- National Institute for Research and Development in Chemistry and Petrochemistry ICECHIM, Splaiul Independentei 202, 060021 Bucharest, Romania;
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Gheorghe Polizu 1-7, 011061 Bucharest, Romania
| | - Denis Mihaela Panaitescu
- National Institute for Research and Development in Chemistry and Petrochemistry ICECHIM, Splaiul Independentei 202, 060021 Bucharest, Romania;
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Oprea M, Panaitescu DM, Nicolae CA, Gabor AR, Frone AN, Raditoiu V, Trusca R, Casarica A. Nanocomposites from functionalized bacterial cellulose and poly(3-hydroxybutyrate-co-3-hydroxyvalerate). Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2020.109203] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Panaitescu DM, Vizireanu S, Stoian SA, Nicolae CA, Gabor AR, Damian CM, Trusca R, Carpen LG, Dinescu G. Poly(3-hydroxybutyrate) Modified by Plasma and TEMPO-Oxidized Celluloses. Polymers (Basel) 2020; 12:polym12071510. [PMID: 32646005 PMCID: PMC7408025 DOI: 10.3390/polym12071510] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/04/2020] [Accepted: 07/06/2020] [Indexed: 01/16/2023] Open
Abstract
Microcrystalline cellulose (MCC) was surface modified by two approaches, namely a plasma treatment in liquid using a Y-shaped tube for oxygen flow (MCC-P) and a TEMPO mediated oxidation (MCC-T). Both treatments led to the surface functionalization of cellulose as illustrated by FTIR and XPS results. However, TEMPO oxidation had a much stronger oxidizing effect, leading to a decrease of the thermal stability of MCC by 80 °C. Plasma and TEMPO modified celluloses were incorporated in a poly(3-hydroxybutyrate) (PHB) matrix and they influenced the morphology, thermal, and mechanical properties of the composites (PHB-MCC-P and PHB-MCC-T) differently. However, both treatments were efficient in improving the fiber-polymer interface and the mechanical properties, with an increase of the storage modulus of composites by 184% for PHB-MCC-P and 167% for PHB-MCC-T at room temperature. The highest increase of the mechanical properties was observed in the composite containing plasma modified cellulose although TEMPO oxidation induced a much stronger surface modification of cellulose. This was due to the adverse effect of more advanced degradation in this last case. The results showed that Y-shaped plasma jet oxidation of cellulose water suspensions is a simple and cheap treatment and a promising method of cellulose functionalization for PHB and other biopolymer reinforcements.
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Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (S.A.S.); (C.-A.N.); (A.R.G.)
- Correspondence: (D.M.P.); (S.V.)
| | - Sorin Vizireanu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania; (L.G.C.); (G.D.)
- Correspondence: (D.M.P.); (S.V.)
| | - Sergiu Alexandru Stoian
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (S.A.S.); (C.-A.N.); (A.R.G.)
- Advanced Polymers Materials Group, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania;
| | - Cristian-Andi Nicolae
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (S.A.S.); (C.-A.N.); (A.R.G.)
| | - Augusta Raluca Gabor
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (S.A.S.); (C.-A.N.); (A.R.G.)
| | - Celina Maria Damian
- Advanced Polymers Materials Group, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania;
| | - Roxana Trusca
- Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania;
| | - Lavinia Gabriela Carpen
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania; (L.G.C.); (G.D.)
- Faculty of Physics, Bucharest University, 405 Atomistilor Street, Magurele-Bucharest, 077125 Ilfov, Romania
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania; (L.G.C.); (G.D.)
- Faculty of Physics, Bucharest University, 405 Atomistilor Street, Magurele-Bucharest, 077125 Ilfov, Romania
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21
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Fierascu I, Fierascu RC, Stirban A, Panaitescu DM, Nicolae CA, Raditoiu V, Zgarciu MS, Leahu AC. Chemical and mineral characterization of Romanian book paper materials (XVII–XIXth century). Microchem J 2020. [DOI: 10.1016/j.microc.2019.104307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Frone AN, Batalu D, Chiulan I, Oprea M, Gabor AR, Nicolae CA, Raditoiu V, Trusca R, Panaitescu DM. Morpho-Structural, Thermal and Mechanical Properties of PLA/PHB/Cellulose Biodegradable Nanocomposites Obtained by Compression Molding, Extrusion, and 3D Printing. Nanomaterials (Basel) 2019; 10:nano10010051. [PMID: 31878292 PMCID: PMC7023130 DOI: 10.3390/nano10010051] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 12/14/2019] [Accepted: 12/20/2019] [Indexed: 01/26/2023]
Abstract
Biodegradable blends and nanocomposites were produced from polylactic acid (PLA), poly(3-hydroxybutyrate) (PHB) and cellulose nanocrystals (NC) by a single step reactive blending process using dicumyl peroxide (DCP) as a cross-linking agent. With the aim of gaining more insight into the impact of processing methods upon the morphological, thermal and mechanical properties of these nanocomposites, three different processing techniques were employed: compression molding, extrusion, and 3D printing. The addition of DCP improved interfacial adhesion and the dispersion of NC in nanocomposites as observed by scanning electron microscopy and atomic force microscopy. The carbonyl index calculated from Fourier transform infrared spectroscopy showed increased crystallinity after DCP addition in PLA/PHB and PLA/PHB/NC, also confirmed by differential scanning calorimetry analyses. NC and DCP showed nucleating activity and favored the crystallization of PLA, increasing its crystallinity from 16% in PLA/PHB to 38% in DCP crosslinked blend and to 43% in crosslinked PLA/PHB/NC nanocomposite. The addition of DCP also influenced the melting-recrystallization processes due to the generation of lower molecular weight products with increased mobility. The thermo-mechanical characterization of uncross-linked and cross-linked PLA/PHB blends and nanocomposites showed the influence of the processing technique. Higher storage modulus values were obtained for filaments obtained by extrusion and 3D printed meshes compared to compression molded films. Similarly, the thermogravimetric analysis showed an increase of the onset degradation temperature, even with more than 10 °C for PLA/PHB blends and nanocomposites after extrusion and 3D-printing, compared with compression molding. This study shows that PLA/PHB products with enhanced interfacial adhesion, improved thermal stability, and mechanical properties can be obtained by the right choice of the processing method and conditions using NC and DCP for balancing the properties.
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Affiliation(s)
- Adriana Nicoleta Frone
- Polymer Department, National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.C.); (M.O.); (A.R.G.); (C.-A.N.); (V.R.); (D.M.P.)
- Correspondence: ; Tel.: +40-21316-3068
| | - Dan Batalu
- Materials Science and Engineering Faculty, University Politehnica of Bucharest, 060042 Bucharest, Romania;
| | - Ioana Chiulan
- Polymer Department, National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.C.); (M.O.); (A.R.G.); (C.-A.N.); (V.R.); (D.M.P.)
| | - Madalina Oprea
- Polymer Department, National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.C.); (M.O.); (A.R.G.); (C.-A.N.); (V.R.); (D.M.P.)
| | - Augusta Raluca Gabor
- Polymer Department, National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.C.); (M.O.); (A.R.G.); (C.-A.N.); (V.R.); (D.M.P.)
| | - Cristian-Andi Nicolae
- Polymer Department, National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.C.); (M.O.); (A.R.G.); (C.-A.N.); (V.R.); (D.M.P.)
| | - Valentin Raditoiu
- Polymer Department, National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.C.); (M.O.); (A.R.G.); (C.-A.N.); (V.R.); (D.M.P.)
| | - Roxana Trusca
- Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania;
| | - Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania; (I.C.); (M.O.); (A.R.G.); (C.-A.N.); (V.R.); (D.M.P.)
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Chiulan I, Panaitescu DM, Radu ER, Frone AN, Gabor RA, Nicolae CA, Jinescu G, Tofan V, Chinga-Carrasco G. Comprehensive characterization of silica-modified silicon rubbers. J Mech Behav Biomed Mater 2019; 101:103427. [PMID: 31539735 DOI: 10.1016/j.jmbbm.2019.103427] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 09/07/2019] [Accepted: 09/09/2019] [Indexed: 11/26/2022]
Abstract
In this study a commercially liquid silicone rubber was filled with fumed silica particles in different concentrations and evaluated for medical applications. The thermal, morphological and mechanical properties of silicone/silica composite samples were studied before and after aging, flexural tests and immersion in saline environment. Understanding the effect of silica content, aging conditions and thickness (from 0.6 to 2 mm) of the samples on the behavior of these materials in different environments is crucial for applications as implantable devices. Before inducing any mechanical stress, tensile strength was found to increase for samples containing 3 or 5 wt% of fumed silica, depending on the thickness. A similar trend was observed after 106 flexes for tensile strength, storage modulus and hardness at room temperature, which increased with the concentration of fumed silica. Moreover, tensile strength decreased with increasing the thickness of the samples from 0.6 to 2 mm. The thermal degradation was found to start at higher temperature in the case of the composites as compared with neat silicone, however, the glass transition and melting temperatures were only slightly modified by the presence of the silica particles, regardless the mechanical aging. The MTT assay using L929 fibroblasts mouse cells showed a good short-time cytocompatibility for both silicone elastomer and the composite with 3 wt% fumed silica. Similarly, the measurement of the cytokine secretion revealed no inflammatory response.
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Affiliation(s)
- Ioana Chiulan
- ICECHIM, 202 Splaiul Independentei, 060021, Bucharest, Romania.
| | | | | | | | | | | | - George Jinescu
- Carol Davila University of Medicine and Pharmacy, 37 Dionisie Lupu, 020022, Bucharest, Romania
| | - Vlad Tofan
- Cantacuzino National Institute of Research and Development for Microbiology and Immunology, 103 Splaiul Independentei, 050096, Bucharest, Romania
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Panaitescu DM, Ionita ER, Nicolae CA, Gabor AR, Ionita MD, Trusca R, Lixandru BE, Codita I, Dinescu G. Poly(3-hydroxybutyrate) Modified by Nanocellulose and Plasma Treatment for Packaging Applications. Polymers (Basel) 2018; 10:E1249. [PMID: 30961174 PMCID: PMC6401738 DOI: 10.3390/polym10111249] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 11/07/2018] [Accepted: 11/08/2018] [Indexed: 11/28/2022] Open
Abstract
In this work, a new eco-friendly method for the treatment of poly(3-hydroxybutyrate) (PHB) as a candidate for food packaging applications is proposed. Poly(3-hydroxybutyrate) was modified by bacterial cellulose nanofibers (BC) using a melt compounding technique and by plasma treatment or zinc oxide (ZnO) nanoparticle plasma coating for better properties and antibacterial activity. Plasma treatment preserved the thermal stability, crystallinity and melting behavior of PHB‒BC nanocomposites, regardless of the amount of BC nanofibers. However, a remarkable increase of stiffness and strength and an increase of the antibacterial activity were noted. After the plasma treatment, the storage modulus of PHB having 2 wt % BC increases by 19% at room temperature and by 43% at 100 °C. The tensile strength increases as well by 21%. In addition, plasma treatment also inhibits the growth of Staphylococcus aureus and Escherichia coli by 44% and 63%, respectively. The ZnO plasma coating led to important changes in the thermal and mechanical behavior of PHB‒BC nanocomposite as well as in the surface structure and morphology. Strong chemical bonding of the metal nanoparticles on PHB surface following ZnO plasma coating was highlighted by infrared spectroscopy. Moreover, the presence of a continuous layer of self-aggregated ZnO nanoparticles was demonstrated by scanning electron microscopy, ZnO plasma treatment completely inhibiting growth of Staphylococcus aureus. A plasma-treated PHB‒BC nanocomposite is proposed as a green solution for the food packaging industry.
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Affiliation(s)
- Denis Mihaela Panaitescu
- National Institute for Research & Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Eusebiu Rosini Ionita
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
| | - Cristian-Andi Nicolae
- National Institute for Research & Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Augusta Raluca Gabor
- National Institute for Research & Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Maria Daniela Ionita
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
| | - Roxana Trusca
- Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania.
| | - Brindusa-Elena Lixandru
- "Cantacuzino" National Medical-Military Institute for Research and Development, 103 Spl. Independentei, 050096 Bucharest, Romania.
| | - Irina Codita
- "Cantacuzino" National Medical-Military Institute for Research and Development, 103 Spl. Independentei, 050096 Bucharest, Romania.
- Carol Davila University of Medicine and Pharmacy, Bulevardul Eroii Sanitari 8, 050474 Bucharest, Romania.
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
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Vizireanu S, Panaitescu DM, Nicolae CA, Frone AN, Chiulan I, Ionita MD, Satulu V, Carpen LG, Petrescu S, Birjega R, Dinescu G. Cellulose defibrillation and functionalization by plasma in liquid treatment. Sci Rep 2018; 8:15473. [PMID: 30341312 PMCID: PMC6195520 DOI: 10.1038/s41598-018-33687-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 10/03/2018] [Indexed: 11/13/2022] Open
Abstract
Submerged liquid plasma (SLP) is a new and promising method to modify powder materials. Up to now, this technique has been mostly applied to carbonaceous materials, however, SLP shows great potential as a low-cost and environmental-friendly method to modify cellulose. In this work we demonstrate the modification of microcrystalline cellulose (MCC) by applying the SLP combined with ultrasonication treatments. The plasma generated either in an inert (argon) or reactive (argon: oxygen or argon:nitrogen) gas was used in MCC dispersions in water or acetonitrile:water mixtures. An enhanced defibrillation of MCC has been observed following the application of SLP. Furthermore, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy have been applied to investigate the surface functionalization of MCC with oxygen or nitrogen moieties. Depending on the plasma treatment applied, poly (3-hydroxybutyrate) composites fabricated with the plasma modified cellulose fibers showed better thermal stability and mechanical properties than pristine PHB. This submerged liquid plasma processing method offers a unique approach for the activation of cellulose for defibrillation and functionalization, aiming towards an improved reinforcing ability of biopolymers.
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Affiliation(s)
- Sorin Vizireanu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest, 060021, Romania.
| | - Cristian Andi Nicolae
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest, 060021, Romania
| | - Adriana Nicoleta Frone
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest, 060021, Romania
| | - Ioana Chiulan
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest, 060021, Romania
| | - Maria Daniela Ionita
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Veronica Satulu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Lavinia Gabriela Carpen
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Simona Petrescu
- Institute of Physical Chemistry "Ilie Murgulescu", Romanian Academy of Sciences, 202 Spl. Independentei, Bucharest, 060021, Romania
| | - Ruxandra Birjega
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
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Panaitescu DM, Vizireanu S, Nicolae CA, Frone AN, Casarica A, Carpen LG, Dinescu G. Treatment of Nanocellulose by Submerged Liquid Plasma for Surface Functionalization. Nanomaterials (Basel) 2018; 8:E467. [PMID: 29949943 PMCID: PMC6070974 DOI: 10.3390/nano8070467] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/22/2018] [Accepted: 06/22/2018] [Indexed: 12/12/2022]
Abstract
Tailoring the surface properties of nanocellulose to improve the compatibility of components in polymer nanocomposites is of great interest. In this work, dispersions of nanocellulose in water and acetonitrile were functionalized by submerged plasmas, with the aim of increasing the quality of this reinforcing agent in biopolymer composite materials. Both the morphology and surface chemistry of nanocellulose were influenced by the application of a plasma torch and filamentary jet plasma in a liquid suspension of nanocellulose. Depending on the type of plasma source and gas mixture the surface chemistry was modified by the incorporation of oxygen and nitrogen containing functional groups. The treatment conditions which lead to nanocellulose based polymer nanocomposites with superior mechanical properties were identified. This work provides a new eco-friendly method for the surface functionalization of nanocellulose directly in water suspension, thus overcoming the disadvantages of chemical treatments.
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Affiliation(s)
- Denis Mihaela Panaitescu
- Department of Polymer, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Sorin Vizireanu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
| | - Cristian Andi Nicolae
- Department of Polymer, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Adriana Nicoleta Frone
- Department of Polymer, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Angela Casarica
- National Institute for Chemical-Pharmaceutical Research and Development, 112 Calea Vitan, 031299 Bucharest, Romania.
| | - Lavinia Gabriela Carpen
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
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Panaitescu DM, Gabor RA, Nicolae CA, Parau AC, Vitelaru C, Raditoiu V, Chipara M. Block Copolymer Elastomer with Graphite Filler: Effect of Processing Conditions and Silane Coupling Agent on the Composite Properties. Polymers (Basel) 2018; 10:E46. [PMID: 30966080 PMCID: PMC6415092 DOI: 10.3390/polym10010046] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 12/22/2017] [Accepted: 12/29/2017] [Indexed: 11/16/2022] Open
Abstract
The control of morphology and interface in poly(styrene-ethylene/butylene-styrene) (SEBS) composites with graphitic fillers is extremely important for the design of piezoresistive sensors for body motion or flexible temperature sensors. The effects of a high amount of graphite (G) and silane coupling agent on the morphology and properties of SEBS composites with anisotropic mechanical properties are reported. The physical and chemical bonding of silane to both G and SEBS surface was proved by EDX and TGA results; this improved interface influenced both the thermal and mechanical properties of the composite. The vinyltriethoxysilane (VS) promoted the formation of char residue and, being tightly bound to both SEBS and G, did not show separate decomposition peak in the TGA curve of composites. The mechanical properties were measured on two perpendicular directions and were improved by both the addition of VS and the increased amount of G; however, the increase of storage modulus due to orientation (from 5 to 15 times depending on the composition and direction of the test) was more important than that provided by the increase of G concentration, which was a maximum of four times that obtained for 15 wt % graphite. A mechanism to explain the influence of G content and treatment on the variation of storage modulus and tan δ depending on the direction of the test was also proposed.
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Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest 060021, Romania.
| | - Raluca Augusta Gabor
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest 060021, Romania.
| | - Cristian Andi Nicolae
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest 060021, Romania.
| | - Anca Constantina Parau
- National Institute for Optoelectronics INOE 2000, 409 Atomistilor St., Magurele 077125, Romania.
| | - Catalin Vitelaru
- National Institute for Optoelectronics INOE 2000, 409 Atomistilor St., Magurele 077125, Romania.
| | - Valentin Raditoiu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest 060021, Romania.
| | - Mircea Chipara
- Department of Physics and Astronomy, The University of Texas Rio Grande Valley, 1201 W. University Drive, Edinburg, TX 78539, USA.
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Chiulan I, Frone AN, Brandabur C, Panaitescu DM. Recent Advances in 3D Printing of Aliphatic Polyesters. Bioengineering (Basel) 2017; 5:bioengineering5010002. [PMID: 29295559 PMCID: PMC5874868 DOI: 10.3390/bioengineering5010002] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 12/21/2017] [Accepted: 12/22/2017] [Indexed: 11/17/2022] Open
Abstract
3D printing represents a valuable alternative to traditional processing methods, clearly demonstrated by the promising results obtained in the manufacture of various products, such as scaffolds for regenerative medicine, artificial tissues and organs, electronics, components for the automotive industry, art objects and so on. This revolutionary technique showed unique capabilities for fabricating complex structures, with precisely controlled physical characteristics, facile tunable mechanical properties, biological functionality and easily customizable architecture. In this paper, we provide an overview of the main 3D-printing technologies currently employed in the case of poly (lactic acid) (PLA) and polyhydroxyalkanoates (PHA), two of the most important classes of thermoplastic aliphatic polyesters. Moreover, a short presentation of the main 3D-printing methods is briefly discussed. Both PLA and PHA, in the form of filaments or powder, proved to be suitable for the fabrication of artificial tissue or scaffolds for bone regeneration. The processability of PLA and PHB blends and composites fabricated through different 3D-printing techniques, their final characteristics and targeted applications in bioengineering are thoroughly reviewed.
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Affiliation(s)
- Ioana Chiulan
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania.
| | - Adriana Nicoleta Frone
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania.
| | - Călin Brandabur
- Symme3D and LTHD Corporation SRL, 300425 Timisoara, Romania.
| | - Denis Mihaela Panaitescu
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania.
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Chiulan I, Frone AN, Panaitescu DM, Nicolae CA, Trusca R. Surface properties, thermal, and mechanical characteristics of poly(vinyl alcohol)-starch-bacterial cellulose composite films. J Appl Polym Sci 2017. [DOI: 10.1002/app.45800] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ioana Chiulan
- Polymer Department; National Institute for Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei, Bucharest 060021 Romania
| | - Adriana Nicoleta Frone
- Polymer Department; National Institute for Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei, Bucharest 060021 Romania
| | - Denis Mihaela Panaitescu
- Polymer Department; National Institute for Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei, Bucharest 060021 Romania
| | - Cristian Andi Nicolae
- Polymer Department; National Institute for Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei, Bucharest 060021 Romania
| | - Roxana Trusca
- Science and Engineering of Oxide Materials and Nanomaterials; University Politehnica of Bucharest; 1-7 Gh. Polizu Street, Bucharest 011061 Romania
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Panaitescu DM, Lupescu I, Frone AN, Chiulan I, Nicolae CA, Tofan V, Stefaniu A, Somoghi R, Trusca R. Medium Chain-Length Polyhydroxyalkanoate Copolymer Modified by Bacterial Cellulose for Medical Devices. Biomacromolecules 2017; 18:3222-3232. [DOI: 10.1021/acs.biomac.7b00855] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021, Bucharest, Romania
| | - Irina Lupescu
- National Institute for Chemical Pharmaceutical R&D, 112 Calea Vitan, 031299, Bucharest, Romania
| | - Adriana Nicoleta Frone
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021, Bucharest, Romania
| | - Ioana Chiulan
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021, Bucharest, Romania
| | - Cristian Andi Nicolae
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021, Bucharest, Romania
| | - Vlad Tofan
- Cantacuzino National Institute of R&D for Microbiology and Immunology, 103 Splaiul Independentei, 050096, Bucharest, Romania
| | - Amalia Stefaniu
- National Institute for Chemical Pharmaceutical R&D, 112 Calea Vitan, 031299, Bucharest, Romania
| | - Raluca Somoghi
- Polymer Department, National Institute for R&D in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021, Bucharest, Romania
| | - Roxana Trusca
- Science
and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
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31
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Petcu C, Purcar V, Spătaru CI, Alexandrescu E, Şomoghi R, Trică B, Niţu SG, Panaitescu DM, Donescu D, Jecu ML. The Influence of New Hydrophobic Silica Nanoparticles on the Surface Properties of the Films Obtained from Bilayer Hybrids. Nanomaterials (Basel) 2017; 7:E47. [PMID: 28336881 PMCID: PMC5333032 DOI: 10.3390/nano7020047] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 02/13/2017] [Accepted: 02/16/2017] [Indexed: 11/16/2022]
Abstract
Ultra-hydrophobic bilayer coatings on a glass surface were fabricated by sol-gel process using hexadecyltrimethoxysilane (C16TMS) and tetramethoxysilane (TMOS) (1:4 molar ratio) as precursors. After coating, silica nanoparticles (SiO₂ NPs) functionalized with different mono-alkoxy derivatives (methoxytrimethylsilane, TMeMS; ethoxydimethylvinylsilane, DMeVES; ethoxydimethylphenylsilane, DMePhES; and methoxydimethyloctylsilane, DMeC₈MS) were added, assuring the microscale roughness on the glass surface. Influences of the functionalized SiO₂ NPs and surface morphology on the hydrophobicity of the hybrid films were discussed. The successful functionalization of SiO₂ NPs with hydrophobic alkyl groups were confirmed by Fourier transform infrared spectroscopy (FTIR). The thermal stability of hydrophobic SiO₂ NPs showed that the degradation of the alkyl groups takes place in the 200-400 °C range. Bilayer coating with C16TMS/TMOS and SiO₂ NPs modified with alkoxysilane substituted with C₈ alkyl chain (SiO₂ NP-C₈) has micro/nano structure. Hydrophobicity of functionalized SiO₂ NPs-C₈ and its higher degree of nanometer-scale roughness gave rise to ultra-hydrophobicity performance for bilayer coating C16TMS/TMOS + SiO₂ NPs-C₈ (145°), compared to other similar hybrid structures. Our synthesis method for the functionalization of SiO₂ NPs is useful for the modification of surface polarity and roughness.
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Affiliation(s)
- Cristian Petcu
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Violeta Purcar
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Cătălin-Ilie Spătaru
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Elvira Alexandrescu
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Raluca Şomoghi
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Bogdan Trică
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Sabina Georgiana Niţu
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Denis Mihaela Panaitescu
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Dan Donescu
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
| | - Maria-Luiza Jecu
- R & D National Institute for Chemistry and Petrochemistry-ICECHIM, Polymers Department, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania.
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Panaitescu DM, Nicolae CA, Frone AN, Chiulan I, Stanescu PO, Draghici C, Iorga M, Mihailescu M. Plasticized poly(3-hydroxybutyrate) with improved melt processing and balanced properties. J Appl Polym Sci 2017. [DOI: 10.1002/app.44810] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Cristian Andi Nicolae
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Adriana Nicoleta Frone
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Ioana Chiulan
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Paul Octavian Stanescu
- Advanced Polymers Materials Group, Politehnica University of Bucharest; 1-7 Polizu Street Bucharest 011061 Romania
| | - Constantin Draghici
- C. D. Nenitescu Organic Chemistry Center of Romanian Academy; 202 B Splaiul Independentei Bucharest 060023 Romania
| | - Michaela Iorga
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry; 202 Splaiul Independentei Bucharest 060021 Romania
| | - Mona Mihailescu
- Physics Department, Faculty of Applied Sciences; Politehnica University of Bucharest; 313 Splaiul Independentei Bucharest 060042 Romania
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Chiulan I, Mihaela Panaitescu D, Nicoleta Frone A, Teodorescu M, Andi Nicolae C, Căşărică A, Tofan V, Sălăgeanu A. Biocompatible polyhydroxyalkanoates/bacterial cellulose composites: Preparation, characterization, andin vitroevaluation. J Biomed Mater Res A 2016; 104:2576-84. [DOI: 10.1002/jbm.a.35800] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 04/22/2016] [Accepted: 05/27/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Ioana Chiulan
- Department of Polymer; National Institute for R&D in Chemistry and Petrochemistry ICECHIM; Bucharest Romania
| | - Denis Mihaela Panaitescu
- Department of Polymer; National Institute for R&D in Chemistry and Petrochemistry ICECHIM; Bucharest Romania
| | - Adriana Nicoleta Frone
- Department of Polymer; National Institute for R&D in Chemistry and Petrochemistry ICECHIM; Bucharest Romania
| | - Mircea Teodorescu
- Department of Bioresources and Polymer Science, Faculty of Applied Chemistry and Materials Science; Polytechnic University of Bucharest; Bucharest Romania
| | - Cristian Andi Nicolae
- Department of Polymer; National Institute for R&D in Chemistry and Petrochemistry ICECHIM; Bucharest Romania
| | - Angela Căşărică
- Department of Pharmaceutical Biotechnologies; National Institute for Chemical Pharmaceutical R&D ICCF; Bucharest Romania
| | - Vlad Tofan
- Infection and Immunity Laboratory; Cantacuzino National Institute; Bucharest Romania
| | - Aurora Sălăgeanu
- Infection and Immunity Laboratory; Cantacuzino National Institute; Bucharest Romania
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Sanporean (née Potarniche) CG, Vuluga Z, Radovici C, Panaitescu DM, Iorga M, Christiansen JD, Mosca A. Polypropylene/organoclay/SEBS nanocomposites with toughness–stiffness properties. RSC Adv 2014. [DOI: 10.1039/c3ra45325a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Panaitescu DM, Frone AN, Nicolae C. Micro- and nano-mechanical characterization of polyamide 11 and its composites containing cellulose nanofibers. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2013.09.031] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Donescu D, Somoghi R, Spataru CI, Manaila-Maximean D, Panaitescu DM, Vasile E, Nistor CL. Hybrid polymeric latexes containing magnetite. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-2976-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Panaitescu DM, Frone AN, Radovici C, Nicolae C, Perrin FX. Influence of octyl substituted octakis(dimethylsiloxy)octasilsesquioxane on the morphology and thermal and mechanical properties of low density polyethylene. POLYM INT 2013. [DOI: 10.1002/pi.4488] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry ICECHIM; 202 Splaiul Independentei 060021 Bucharest Romania
| | - Adriana Nicoleta Frone
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry ICECHIM; 202 Splaiul Independentei 060021 Bucharest Romania
| | - Constantin Radovici
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry ICECHIM; 202 Splaiul Independentei 060021 Bucharest Romania
| | - Cristian Nicolae
- Polymer Department; National Institute of Research and Development in Chemistry and Petrochemistry ICECHIM; 202 Splaiul Independentei 060021 Bucharest Romania
| | - François Xavier Perrin
- Laboratoire Matériaux Polymères, Interfaces, Environnement Marin (MAPIEM), Institut des Sciences de L'Ingenieur de Toulon et du Var; Université du Sud Toulon Var; Avenue Georges Pompidou BP 56-83162 La Valette du Var Cedex France
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Panaitescu DM, Vuluga Z, Notingher PV, Nicolae C. The effect of poly[styrene-b
-(ethylene-co
-butylene)- b
-styrene] on dielectric, thermal, and morphological characteristics of polypropylene/silica nanocomposites. POLYM ENG SCI 2013. [DOI: 10.1002/pen.23475] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department; National Institute for Research and Development in Chemistry and Petrochemistry; 060021 Bucharest Romania
| | - Zina Vuluga
- Polymer Department; National Institute for Research and Development in Chemistry and Petrochemistry; 060021 Bucharest Romania
| | - Petru V. Notingher
- Faculty of Electrical Engineering; ELMAT Laboratory; University POLITEHNICA of Bucharest; 060042 Bucharest Romania
| | - Cristian Nicolae
- Polymer Department; National Institute for Research and Development in Chemistry and Petrochemistry; 060021 Bucharest Romania
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Vuluga Z, Panaitescu DM, Radovici C, Nicolae C, Iorga MD. Effect of SEBS on morphology, thermal, and mechanical properties of PP/organoclay nanocomposites. Polym Bull (Berl) 2012. [DOI: 10.1007/s00289-012-0780-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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