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Zhong Y, Zhuo L, Lu W. Analysis of photocatalytic degradation of polyamide microplastics in metal salt solution by high resolution mass spectrometry. J Environ Sci (China) 2024; 139:473-482. [PMID: 38105070 DOI: 10.1016/j.jes.2023.06.018] [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: 03/03/2023] [Revised: 06/12/2023] [Accepted: 06/12/2023] [Indexed: 12/19/2023]
Abstract
Microplastic pollution has become one of the most concerned focuses in the world. Among many treatment methods, photocatalysis is considered to be one of the most environmentally friendly methods. In this work, the photodegradation behavior of polyamide microplastics is studied by using polyamide 6 PA6) as model microplastics and FeCl3 as catalyst. It is hoped that the PA6 fiber can be effectively degraded by utilizing the strong oxidizing active species that can be produced after FeCl3 is irradiated in water. The results shows that PA6 fiber can be almost completely degraded after 10 days of irradiation in FeCl3 aqueous solution, indicating that it is promising to use this new method to solve the problem of PA6 type microplastics. In addition, the chain scission mechanism and degradation process of PA6 are analyzed in detail by ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS), which provides a new insight for the study of polymer degradation mechanism.
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Affiliation(s)
- Yunjin Zhong
- National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), School of Materials Science & Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Lebing Zhuo
- National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), School of Materials Science & Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Wangyang Lu
- National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), School of Materials Science & Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.
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2
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Fan S, Zeng J, Yang P, Cheng M. A novel phosphorus-nitrogen-based hyperbranched polysiloxane for improving the fire safety of PA6 with suppressed melt droplets and good mechanical properties. Heliyon 2023; 9:e22877. [PMID: 38058448 PMCID: PMC10696183 DOI: 10.1016/j.heliyon.2023.e22877] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 10/06/2023] [Accepted: 11/22/2023] [Indexed: 12/08/2023] Open
Abstract
The combustible defects of polyamide 6 (PA6), especially the flammable melt-dripping behavior, have greatly limited its application in some particular fields. In this work, a halogen-free hyperbranched polysiloxane (PBDSi) containing DOPO and Schiff base was designed via Michael's addition reaction and dehydration-condensation reaction. Results showed that the char yield (Yc) of PBDSi attained 37.9 wt%, confirming the satisfactory charring behavior of PBDSi for preparing flame-retardant PA6. Just by adding 3 wt% of PBDSi, the serious melt droplets of PA6 were suppressed effectively. The prepared PA6/PBDSi-3 with 5 wt% of PBDSi could achieve the highest value of limited oxygen index (LOI) of 27.2 %, while that of PA6 is 21.0 %. Meanwhile, PA6/PBDSi-3 obtained an apparent reduction in the peak heat release rate (PHRR) value of 31.1 % compared with pure PA6. The cooperated effect of DOPO, Schiff base, and polysiloxane that contributed to generating a silicon-phosphorous-rich char layer and releasing incombustible volatiles that were determined to be the essential factor for the improved fire safety of PA6/PBDSi were explored intensively. Inspiringly, PA6/PBDSi composites exhibited a slight mechanical loss concerning PA6, overcoming the great challenge of developing additive flame-retardant materials to balance mechanical properties and fire safety.
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Affiliation(s)
- Shuo Fan
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018, China
- Zhejiang Sci-tech University Tongxiang Research Institute, Tongxiang, Zhejiang Province, China
- School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu, 214122, China
| | - Jinhao Zeng
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018, China
- Zhejiang Sci-tech University Tongxiang Research Institute, Tongxiang, Zhejiang Province, China
| | - Peng Yang
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018, China
- Zhejiang Sci-tech University Tongxiang Research Institute, Tongxiang, Zhejiang Province, China
| | - Meijia Cheng
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018, China
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Shakiba M, Sheikhi M, Pahnavar Z, Tajiki A, Bigham A, Foroozandeh A, Darvishan S, Pourmadadi M, Emadi H, Rezatabar J, Abdouss H, Abdouss M. Development of an antibacterial and antioxidative nanofibrous membrane using curcumin-loaded halloysite nanotubes for smart wound healing: In vitro and in vivo studies. Int J Pharm 2023; 642:123207. [PMID: 37419431 DOI: 10.1016/j.ijpharm.2023.123207] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [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: 05/31/2023] [Revised: 07/02/2023] [Accepted: 07/04/2023] [Indexed: 07/09/2023]
Abstract
Endowing wound dressings with drug delivery capability is a suitable strategy to transfer medicinal compounds locally to damaged skin layers. These dressings are especially useful for accelerating the healing rate in the cases of long-term treatment, and adding more functionalities to the platform. In this study, a wound dressing composed of polyamide 6, hyaluronic acid, and curcumin-loaded halloysite nanotubes (PA6/HA/HNT@Cur) was designed and fabricated for wound healing applications. The physicochemical properties of this platform were investigated through Fourier-transform infrared spectroscopy and field-emission scanning electron microscopy. Moreover, wettability, tensile strength, swelling, and in vitro degradation were assessed. The HNT@Cur was incorporated in the fibers in three concentrations and 1 wt% was found as the optimum concentration yielding desirable structural and mechanical properties. The loading efficiency of Cur on HNT was calculated to be 43 ± 1.8%, and the release profiles and kinetics of nanocomposite were investigated at physiological and acidic pH. In vitro antibacterial and antioxidation studies showed that the PA6/HA/HNT@Cur mat had strong antibacterial and antioxidation activities against gram-positive and -negative pathogens and reactive oxygen species, respectively. Desirable cell compatibility of the mat was found through MTT assay against L292 cells up to 72 h. Finally, the efficacy of the designed wound dressing was evaluated in vivo; after 14 days, the results indicated that the wound size treated with the nanocomposite mat significantly decreased compared to the control sample. This study proposed a swift and straightforward method for developing materials that might be utilized as wound dressings in clinical settings.
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Affiliation(s)
| | - Mehdi Sheikhi
- Polymer Chemistry Research Laboratory, Department of Chemistry, University of Isfahan, Isfahan, Iran
| | - Zohreh Pahnavar
- Department of Chemistry, University of Mazandaran, Babolsar, Iran
| | - Alireza Tajiki
- Department of Chemistry, Amirkabir University of Technology, Tehran, Iran
| | - Ashkan Bigham
- Institute of Polymers, Composites and Biomaterials, National Research Council of Italy (IPCB-CNR), Viale John Fitzgerald Kennedy 54, Mostra d'Oltremare Padiglione 20, 80125 Naples, Italy; Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy.
| | - Amin Foroozandeh
- Department of Chemistry, Amirkabir University of Technology, Tehran, Iran
| | - Sepehr Darvishan
- Department of Chemistry, Amirkabir University of Technology, Tehran, Iran
| | - Mehrab Pourmadadi
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Hamid Emadi
- Department of Chemistry, University of Mazandaran, Babolsar, Iran
| | - Javad Rezatabar
- Department of Pathology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Hamidreza Abdouss
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Majid Abdouss
- Department of Chemistry, Amirkabir University of Technology, Tehran, Iran.
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4
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Hao L, Qi Y, Wu Y, Xia D. Determination of trace potassium permanganate in tap water by solid phase extraction combined with spectrophotometry. Heliyon 2023; 9:e13587. [PMID: 36851959 PMCID: PMC9958420 DOI: 10.1016/j.heliyon.2023.e13587] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 02/03/2023] [Accepted: 02/03/2023] [Indexed: 02/11/2023] Open
Abstract
A simple solid phase extraction (SPE) coupled with spectrophotometric method was developed for determination of trace permanganate (MnO4 -) in water. Commercial reagent polyamined-6 powder was used as SPE stationary phase to retain MnO4 - which is based on the fact that MnO4 - can be adsorbed on polyamide 6 (PA-6) sorbent as water samples flow through the SPE cartridge. 3,3',5,5'-tetramethylbenzidine (TMB) were used both as eluent solution and chromogenic agent to convert the adsorbed MnO4 - into Mn2+ and generate blue oxidized product with high molar absorptivity. Quantification of MnO4 - could be obtained by spectrophotometric detection of the resulting solution flow out of the SPE cartridge. The extraction and detection variables was optimized to maximize the absorbance of the TMB oxidized product. Under optimized conditions, this method provided linear dynamic ranges of 0.01-1 μmol L-1 for MnO4 - with preconcentration of 100 mL water sample. The limits of detection (3Sb/m) of this method in deionized water were calculated to be 5.1 nM, and the relative standard deviations were determined to be 3.2% (C = 0.1 μmol L-1, n = 5). This method has been applied to the determination of MnO4 - in spiked tap waters and satisfactory recovery was obtained.
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Affiliation(s)
- Liang Hao
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, 723001, PR China
| | - Yaxin Qi
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, 723001, PR China
| | - Yingchun Wu
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, 723001, PR China
| | - Donghui Xia
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, 723001, PR China
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Li Y, Wang J, Xue B, Wang S, Qi P, Sun J, Li H, Gu X, Zhang S. Enhancing the flame retardancy and UV resistance of polyamide 6 by introducing ternary supramolecular aggregates. Chemosphere 2022; 287:132100. [PMID: 34826889 DOI: 10.1016/j.chemosphere.2021.132100] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 08/26/2021] [Accepted: 08/29/2021] [Indexed: 06/13/2023]
Abstract
An integrated multi-functional additive was fabricated by successively grafting melamine (MEL) and phytic acid (PhA) on multiwalled carbon-nanotubes (MWNCTs), and was then applied in PA6 to improve the flame retardancy and light aging resistance of the composite. The limit oxygen index of PA6 composite containing 7 wt% PhA-MEL-MWCNTs was increased to 26.4 from 21.0. The smoke and CO release were significantly reduced by 48% and 88% respectively, and the severe melt dripping of PA6 in burning was eliminated. It is proved that PhA-MEL-MWCNTs can absorb ultraviolet (UV) radiation, and hence significantly reduces the mechanical property loss of the PA6 composite after UV aging. The tensile strength of the aged PA6/7 wt%PhA-MEL-MWCNTs composite sample only decreased by 18.1%, which was significantly lower than the loss rate of the control aged PA6 sample (62.5%). This protocol provides a new opportunity for fabricating long-life flame retardant polyamide composites.
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Affiliation(s)
- Yuchun Li
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Jinzhao Wang
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Boqiong Xue
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Shuheng Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Peng Qi
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Jun Sun
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Hongfei Li
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xiaoyu Gu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China.
| | - Sheng Zhang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China.
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6
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Terekhina S, Tarasova T, Egorov S, Skornyakov I, Guillaumat L, Hattali M. The effect of build orientation on both flexural quasi-static and fatigue behaviours of filament deposited PA6 polymer. Int J Fatigue 2020; 140:105825. [PMID: 32834205 PMCID: PMC7357525 DOI: 10.1016/j.ijfatigue.2020.105825] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 07/06/2020] [Accepted: 07/08/2020] [Indexed: 06/09/2023]
Abstract
The present paper aims to study the effect of manufacturing build orientation on both flexural quasi-static and fatigue behaviours of semi-crystalline polyamide 6 obtained by Fused Filament Fabrication (FFF), by considering the porosity and surface roughness. The glass transition temperature, melting temperature, and crystallinity degree were measured complementary to understand better the process. Fatigue analysis is here fully described in visco-elastic domain of material. The results highlight that the XZ build orientation is better than the XY one and suggest that porosity plays an important role. The obtained results are also compared with conventional techniques given by the literature review.
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Affiliation(s)
- S. Terekhina
- Arts et Métiers ParisTech, Campus Angers, Laboratory LAMPA, 2 Bd du Ronceray, 49035 Angers Cedex 1, France
| | - T. Tarasova
- Moscow State University of Technology “STANKIN”, 3-A Vadkovskiy Pereulok, 127055 Moscow, Russia
| | - S. Egorov
- Moscow State University of Technology “STANKIN”, 3-A Vadkovskiy Pereulok, 127055 Moscow, Russia
| | - I. Skornyakov
- Moscow State University of Technology “STANKIN”, 3-A Vadkovskiy Pereulok, 127055 Moscow, Russia
| | - L. Guillaumat
- Arts et Métiers ParisTech, Campus Angers, Laboratory LAMPA, 2 Bd du Ronceray, 49035 Angers Cedex 1, France
| | - M.L. Hattali
- Université Paris-Saclay, CNRS, FAST, 91405 Orsay, France
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Ryšánek P, Čapková P, Štojdl J, Trögl J, Benada O, Kormunda M, Kolská Z, Munzarová M. Stability of antibacterial modification of nanofibrous PA6/DTAB membrane during air filtration. Mater Sci Eng C Mater Biol Appl 2019; 96:807-813. [PMID: 30606594 DOI: 10.1016/j.msec.2018.11.065] [Citation(s) in RCA: 10] [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] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 10/16/2018] [Accepted: 11/27/2018] [Indexed: 11/29/2022]
Abstract
Stable antimicrobial nanofibrous membrane for air filtration based on polyamide 6 (hereafter PA6) modified by 1-dodecyltrimethylammonium bromide (DTAB) has been prepared by electrospinning using one-step technology, i.e. with modifying antimicrobial agent dissolved in spinning solution. Stability of antibacterial membrane function has been tested by air-blowing test to prove the permanency of chemical composition and antibacterial activity. X-ray diffraction, high-resolution scanning electron microscopy (HRSEM) revealed the effect of modifying agent on structure and morphology of PA6 nanofibres. X-ray photoelectron spectroscopy, electrokinetic analysis and antibacterial tests proved the stability of chemical composition and antibacterial activity after air-blowing tests. Special air-blowing device has been constructed for this purpose. The results prove the applicability so prepared membrane for a long-term air-conditioning.
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Affiliation(s)
- Petr Ryšánek
- Faculty of Science, J. E. Purkyně University, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic.
| | - Pavla Čapková
- Faculty of Science, J. E. Purkyně University, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic
| | - Jiří Štojdl
- Faculty of Environment, J. E. Purkyně University, Králova výšina 3132/7, 400 96 Ústí nad Labem, Czech Republic
| | - Josef Trögl
- Faculty of Environment, J. E. Purkyně University, Králova výšina 3132/7, 400 96 Ústí nad Labem, Czech Republic
| | - Oldřich Benada
- Faculty of Science, J. E. Purkyně University, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic; Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, 14 220 Prague 4, Czech Republic
| | - Martin Kormunda
- Faculty of Science, J. E. Purkyně University, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic
| | - Zdeňka Kolská
- Faculty of Science, J. E. Purkyně University, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic
| | - Marcela Munzarová
- Nanovia, s. r. o., Litvínov, Podkrušnohorská 271, 436 03, Chudeřín, Czech Republic
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Song HJ, Chang Y, Lyu JS, Yon MY, Lee HS, Park SJ, Choi JC, Kim M, Han J. Migration study of caprolactam from polyamide 6 sheets into food simulants. Food Sci Biotechnol 2018; 27:1685-1689. [PMID: 30483432 DOI: 10.1007/s10068-018-0403-4] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 05/08/2018] [Accepted: 05/14/2018] [Indexed: 11/29/2022] Open
Abstract
Caprolactam, used in manufacturing polyamide (PA) 6, may threaten human health. Here, PA 6 sheets were produced by using a twin-screw extruder to evaluate its safety. Caprolactam migration concentrations from the PA 6 sheets into food simulants were evaluated according to the standard migration test conditions under the Korean Food Standards Codex (KFSC). Concentrations were investigated under various food simulants (distilled water, 4% acetic acid, 20 and 50% ethanol, and heptane) and storage conditions (at 25, 60, and 95 °C). Caprolactam migration concentrations into food simulants were determined as follows: 4% acetic acid (0.982 mg/L), distilled water (0.851 mg/L), 50% ethanol (0.624 mg/L), 20% ethanol (0.328 mg/L), and n-heptane (not detected). Migrations were determined to be under the regulatory concentration (15 mg/L) according to the KFSC test conditions. Taken together, these results verified that the standard migration test conditions by KFSC were reliable to evaluate the safety of PA 6.
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Affiliation(s)
- Hyun Ju Song
- 1Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, 136-701 Republic of Korea
| | - Yoonjee Chang
- 2Department of Food Bioscience and Technology, College of Life Sciences and Biotechnology, Korea University, Seoul, 02841 Republic of Korea
| | - Ji Sou Lyu
- 1Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, 136-701 Republic of Korea
| | - Mi Yong Yon
- Nutrition Policy and Promotion Team, Korean Health Industry Development Institute, Osong, 363-951 Republic of Korea
| | - Haeng-Shin Lee
- Nutrition Policy and Promotion Team, Korean Health Industry Development Institute, Osong, 363-951 Republic of Korea
| | - Se-Jong Park
- 4Food Additives and Packaging Division, National Institute of Food and Drug Safety Evaluation, Ministry of Food and Drug Safety, Osong, 28159 Republic of Korea
| | - Jae Chun Choi
- 4Food Additives and Packaging Division, National Institute of Food and Drug Safety Evaluation, Ministry of Food and Drug Safety, Osong, 28159 Republic of Korea
| | - MeeKyung Kim
- 4Food Additives and Packaging Division, National Institute of Food and Drug Safety Evaluation, Ministry of Food and Drug Safety, Osong, 28159 Republic of Korea
| | - Jaejoon Han
- 1Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, 136-701 Republic of Korea.,2Department of Food Bioscience and Technology, College of Life Sciences and Biotechnology, Korea University, Seoul, 02841 Republic of Korea
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Liu S, Zhang C, Proniewicz E, Proniewicz LM, Kim Y, Liu J, Zhao Y, Xu Y, Wu J. Crystalline transition and morphology variation of polyamide 6/CaCl2 composite during the decomplexation process. Spectrochim Acta A Mol Biomol Spectrosc 2013; 115:783-788. [PMID: 23892342 DOI: 10.1016/j.saa.2013.06.056] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 05/20/2013] [Accepted: 06/13/2013] [Indexed: 06/02/2023]
Abstract
In this work, we developed a new method to prepare porous PA6 with different morphologic feature and crystalline forms via the decomplexation of PA6/CaCl2 composite. The structures and morphology of thus obtained materials were characterized by vibrational spectroscopy (FT-IR and Raman) and scanning electron microscope (SEM) method. When amorphous PA6/CaCl2 composite films were treated in water at room temperature, PA6 re-arranges into γ form. However, decomplexation of the PA6/CaCl2 composite in boiling water produces PA6 in α crystalline form. If the PA6/CaCl2 composite is soaked in methanol, part of PA6 is dissolved or swollen in methanol/metal salt solutions. As a result, a dissolve/precipitation process occurred during the decomplexation process, which led to the formation of PA6 in α crystalline form. Further investigation demonstrates that the morphologies of the porous PA6 could be adjusted by using different solvents and/or different decomplexation conditions.
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Affiliation(s)
- Shaoxuan Liu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China
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