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Łukaszewska I, Bukowczan A, Raftopoulos KN, Pielichowski K. Examining the Water-Polymer Interactions in Non-Isocyanate Polyurethane/Polyhedral Oligomeric Silsesquioxane Hybrid Hydrogels. Polymers (Basel) 2023; 16:57. [PMID: 38201722 PMCID: PMC10780322 DOI: 10.3390/polym16010057] [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: 11/30/2023] [Revised: 12/19/2023] [Accepted: 12/20/2023] [Indexed: 01/12/2024] Open
Abstract
Non-isocyanate polyurethane (NIPU) networks physically modified with octa(3-hydroxy-3-methylbutyldimethylsiloxy)POSS (8OHPOSS, 0-10 wt%) were conditioned in environments of different relative humidities (up to 97%) to study water-polymer interactions. The equilibrium sorption isotherms are of Brunauer type III in a water activity range of 0-0.97 and are discussed in terms of the Guggenheim (GAB) sorption model. The study shows that the introduction of 8OHPOSS, even in a large amount (10 wt%), does not hinder the water affinity of the NIPU network despite the hydrophobic nature of POSS; this is attributable to the homogenous dispersion of POSS in the polymer matrix. The shift in the urethane-derived carbonyl bands toward lower wavenumbers with a simultaneous shift in the urethane N-H bending bands toward higher wavenumbers exposes the breakage of polymer-polymer hydrogen bonds upon water uptake due to the formation of stronger water-polymer hydrogen bonds. Upon water absorption, a notable decrease in the glass transition temperature (Tg) is observed for all studied materials. The progressive reduction in Tg with water uptake is driven by plasticization and slaving mechanisms. POSS moieties are thought to impact slaving indirectly by slightly affecting water uptake at very high hydration levels.
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Affiliation(s)
- Izabela Łukaszewska
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland; (A.B.); (K.N.R.)
| | | | | | - Krzysztof Pielichowski
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland; (A.B.); (K.N.R.)
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Raftopoulos KN, Klonos PA, Tworzydło P, Ozimek J, Hebda E, Kyritsis A, Pielichowski K. Effects of Segment Length and Crosslinking via POSS on the Calorimetric and Dynamic Glass Transition of Polyurethanes with Aliphatic Hard Segments. Int J Mol Sci 2023; 24:16540. [PMID: 38003729 PMCID: PMC10671415 DOI: 10.3390/ijms242216540] [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: 11/02/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 11/26/2023] Open
Abstract
The glass transition in polyurethanes is a complicated phenomenon governed by a multitude of factors, including the microphase separation, which in turn depends strongly on the molar mass of the hard and soft segments, as well as the presence of additives. In this work, we study the effects of the segments' length on the microphase separation and consequently on the calorimetric and dynamic glass transition of a polyurethane with aliphatic, "flexible" hard segments. It is found that the dependence of the calorimetric glass transition follows the same principles as those in systems with aromatic hard segments. Strikingly, however, the dynamic glass transition, as studied by dielectric spectroscopy, shows a slowing down of its dynamics despite a decrease in Tg. This discrepancy is discussed in terms of the strong dielectric response of the flexible segments, especially those close to the interface between the hard domains and soft phase, as opposed to a weak thermal one. In addition, polyhedral oligomeric silsesquioxanes (POSS) are introduced in the soft phase of the three matrices as crosslinking centres. This modification has no visible effect on the calorimetric glass transition; nevertheless, it affects the microphase separation and the dielectric response in a non-monotonic manner.
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Affiliation(s)
- Konstantinos N. Raftopoulos
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland (J.O.); (E.H.); (K.P.)
| | - Panagiotis A. Klonos
- Department of Physics, Zografou Campus, National Technical University of Athens, Iroon Politechneiou 9, 157 80 Athens, Greece; (P.A.K.); (A.K.)
| | - Patrycja Tworzydło
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland (J.O.); (E.H.); (K.P.)
| | - Jan Ozimek
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland (J.O.); (E.H.); (K.P.)
| | - Edyta Hebda
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland (J.O.); (E.H.); (K.P.)
| | - Apostolos Kyritsis
- Department of Physics, Zografou Campus, National Technical University of Athens, Iroon Politechneiou 9, 157 80 Athens, Greece; (P.A.K.); (A.K.)
| | - Krzysztof Pielichowski
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland (J.O.); (E.H.); (K.P.)
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Bukowczan A, Raftopoulos KN, Czajkowski M, Szefer E, Hebda E, Pielichowski K. Liquid crystalline polyurethanes modified by Trisilanolisobutyl-POSS. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118069] [Citation(s) in RCA: 1] [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: 11/24/2022]
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Haraźna K, Cichoń E, Skibiński S, Witko T, Solarz D, Kwiecień I, Marcello E, Zimowska M, Socha R, Szefer E, Zima A, Roy I, Raftopoulos KN, Pielichowski K, Witko M, Guzik M. Physicochemical and Biological Characterisation of Diclofenac Oligomeric Poly(3-hydroxyoctanoate) Hybrids as β-TCP Ceramics Modifiers for Bone Tissue Regeneration. Int J Mol Sci 2020; 21:E9452. [PMID: 33322564 PMCID: PMC7763618 DOI: 10.3390/ijms21249452] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/03/2020] [Accepted: 12/09/2020] [Indexed: 12/22/2022] Open
Abstract
Nowadays, regenerative medicine faces a major challenge in providing new, functional materials that will meet the characteristics desired to replenish and grow new tissue. Therefore, this study presents new ceramic-polymer composites in which the matrix consists of tricalcium phosphates covered with blends containing a chemically bounded diclofenac with the biocompatible polymer-poly(3-hydroxyoctanoate), P(3HO). Modification of P(3HO) oligomers was confirmed by NMR, IR and XPS. Moreover, obtained oligomers and their blends were subjected to an in-depth characterisation using GPC, TGA, DSC and AFM. Furthermore, we demonstrate that the hydrophobicity and surface free energy values of blends decreased with the amount of diclofenac modified oligomers. Subsequently, the designed composites were used as a substrate for growth of the pre-osteoblast cell line (MC3T3-E1). An in vitro biocompatibility study showed that the composite with the lowest concentration of the proposed drug is within the range assumed to be non-toxic (viability above 70%). Cell proliferation was visualised using the SEM method, whereas the observation of cell penetration into the scaffold was carried out by confocal microscopy. Thus, it can be an ideal new functional bone tissue substitute, allowing not only the regeneration and restoration of the defect but also inhibiting the development of chronic inflammation.
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Affiliation(s)
- Katarzyna Haraźna
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Kraków, Poland; (T.W.); (M.Z.); (R.S.); (M.W.)
| | - Ewelina Cichoń
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30 Mickiewicza Ave., 30-059 Kraków, Poland; (E.C.); (S.S.); (A.Z.)
| | - Szymon Skibiński
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30 Mickiewicza Ave., 30-059 Kraków, Poland; (E.C.); (S.S.); (A.Z.)
| | - Tomasz Witko
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Kraków, Poland; (T.W.); (M.Z.); (R.S.); (M.W.)
| | - Daria Solarz
- Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Lojasiewicza 11, 30-348 Kraków, Poland;
| | - Iwona Kwiecień
- Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, M. Strzody 9, 44-100 Gliwice, Poland;
| | - Elena Marcello
- School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, New Cavendish Street, London W1W 6UW, UK;
| | - Małgorzata Zimowska
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Kraków, Poland; (T.W.); (M.Z.); (R.S.); (M.W.)
| | - Robert Socha
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Kraków, Poland; (T.W.); (M.Z.); (R.S.); (M.W.)
| | - Ewa Szefer
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland; (E.S.); (K.N.R.); (K.P.)
| | - Aneta Zima
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30 Mickiewicza Ave., 30-059 Kraków, Poland; (E.C.); (S.S.); (A.Z.)
| | - Ipsita Roy
- Department of Materials Science and Engineering, University of Sheffield, Broad Lane, Sheffield S3 7HQ, UK;
| | - Konstantinos N. Raftopoulos
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland; (E.S.); (K.N.R.); (K.P.)
| | - Krzysztof Pielichowski
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland; (E.S.); (K.N.R.); (K.P.)
| | - Małgorzata Witko
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Kraków, Poland; (T.W.); (M.Z.); (R.S.); (M.W.)
| | - Maciej Guzik
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Niezapominajek 8, 30-239 Kraków, Poland; (T.W.); (M.Z.); (R.S.); (M.W.)
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Raftopoulos KN, Kyriakos K, Nuber M, Niebuur BJ, Holderer O, Ohl M, Ivanova O, Pasini S, Papadakis CM. Co-nonsolvency in concentrated aqueous solutions of PNIPAM: effect of methanol on the collective and the chain dynamics. Soft Matter 2020; 16:8462-8472. [PMID: 32856669 DOI: 10.1039/d0sm01007c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The polymer dynamics in concentrated solutions of poly(N-isopropyl acrylamide) (PNIPAM) in D2O/CD3OD mixtures is investigated in the one-phase region. Two polymer concentrations (9 and 25 wt%) and CD3OD contents in the solvent mixture of 0, 10 and 15 vol% are chosen. Temperature-resolved dynamic light scattering (DLS) reveals the collective dynamics. Two modes are observed, namely the fast relaxation of polymer segments within the blobs and the slow collective relaxation of the blobs. As the cloud point is approached, the correlation length related to the fast mode increases with CD3OD content. It features critical scaling behavior, which is consistent with mean-field behavior for the 9 wt% PNIPAM solution in pure D2O and with 3D Ising behavior for all other solutions. While the slow mode is not very strong in the 9 wt% PNIPAM solution in pure D2O, it is significantly more prominent as CD3OD is added and at all CD3OD contents in the 25 wt% solution, which may be attributed to enhanced interaction between the polymers. Neutron spin-echo spectroscopy (NSE) reveals a decay in the intermediate structure factor which indicates a diffusive process. For the polymer concentration of 9 wt%, the diffusion coefficients from NSE are similar to the ones from the fast relaxation observed in DLS. In contrast, they are significantly lower for the solutions having a polymer concentration of 25 wt%, which is attributed to the influence of the dominant large-scale dynamic heterogeneities. To summarize, addition of cosolvent leads to enhanced large-scale heterogeneities, which are reflected in the dynamic behavior at small length scales.
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Affiliation(s)
- Konstantinos N Raftopoulos
- Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Konstantinos Kyriakos
- Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Matthias Nuber
- Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Bart-Jan Niebuur
- Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Olaf Holderer
- Jülich Centre for Neutron Science at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching, Germany
| | - Michael Ohl
- Jülich Centre for Neutron Science JCNS-1, Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Str., 52425 Jülich, Germany
| | - Oxana Ivanova
- Jülich Centre for Neutron Science at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching, Germany
| | - Stefano Pasini
- Jülich Centre for Neutron Science at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching, Germany
| | - Christine M Papadakis
- Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
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Raftopoulos KN, Łukaszewska I, Klonos PΑ, Hebda E, Bukowczan A, Kyritsis A, Pielichowski K. Molecular and charge mobility of a poloxamer in the bulk and as soft component in polyurethanes. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121821] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Majka TM, Bartyzel O, Raftopoulos KN, Pagacz J, Pielichowski K. Examining the Influence of Re-Used Nanofiller-Pyrolyzed Montmorillonite, on the Thermal Properties of Polypropylene-Based Engineering Nanocomposites. Materials (Basel) 2019; 12:ma12162636. [PMID: 31430928 PMCID: PMC6720894 DOI: 10.3390/ma12162636] [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] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/06/2019] [Accepted: 08/14/2019] [Indexed: 06/10/2023]
Abstract
Pyrolysis of the polypropylene/montmorillonite (PP/OMMT) nanocomposites allows for recovery of the filler that can be then re-used to produce PP/pyrolyzed MMT (PMMT) nanostructured composites. In this work, we discuss the thermal properties of PP/PMMT composites investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). It has been found that effect of PMMT (5 wt. % and 10 wt. %) on matrix thermal stability occurs at temperatures above 300 °C. Addition of 5 wt. % and 10 wt. % of PMMT into polypropylene system gave good stabilization effect, as confirmed by the overall stabilization effect (OSE) values, which increased by 4% and 7%, respectively, compared to the control sample (PP). Interestingly, the presence of 1 wt. % and 3 wt. % of pyrolyzed clay stabilizes the system better than the same concentrations of organoclay added into polypropylene melt. DSC data revealed that pyrolyzed clay has still the same tendency as organoclay to enhance formation of the α and β crystalline PP phases only. The pyrolyzed MMT causes an improvement of the modulus in the glassy as well as rubbery regions, as confirmed by DMA results.
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Affiliation(s)
- Tomasz M Majka
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland.
| | - Oskar Bartyzel
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
| | - Konstantinos N Raftopoulos
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
| | - Joanna Pagacz
- Institute of Ceramics and Building Materials, ul. Postępu 9, 02-676 Warszawa, Poland
| | - Krzysztof Pielichowski
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
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Szefer E, Stafin K, Leszczyńska A, Zając P, Hebda E, Raftopoulos KN, Pielichowski K. Morphology, dynamics, and order development in a thermoplastic polyurethane with melt blended POSS. ACTA ACUST UNITED AC 2019. [DOI: 10.1002/polb.24868] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ewa Szefer
- Department of Chemistry and Technology of PolymersCracow University of Technology, ul. Warszawska 24, 31‐155 Kraków Poland
| | - Krzysztof Stafin
- Department of Chemistry and Technology of PolymersCracow University of Technology, ul. Warszawska 24, 31‐155 Kraków Poland
| | - Agnieszka Leszczyńska
- Department of Chemistry and Technology of PolymersCracow University of Technology, ul. Warszawska 24, 31‐155 Kraków Poland
| | - Paulina Zając
- Department of Chemistry and Technology of PolymersCracow University of Technology, ul. Warszawska 24, 31‐155 Kraków Poland
| | - Edyta Hebda
- Department of Chemistry and Technology of PolymersCracow University of Technology, ul. Warszawska 24, 31‐155 Kraków Poland
| | - Konstantinos N. Raftopoulos
- Department of Chemistry and Technology of PolymersCracow University of Technology, ul. Warszawska 24, 31‐155 Kraków Poland
| | - Krzysztof Pielichowski
- Department of Chemistry and Technology of PolymersCracow University of Technology, ul. Warszawska 24, 31‐155 Kraków Poland
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Koutsoumpis S, Klonos P, Raftopoulos KN, Papadakis CM, Bikiaris D, Pissis P. Morphology, thermal properties and molecular dynamics of syndiotactic polystyrene (s-PS) nanocomposites with aligned graphene oxide and graphene nanosheets. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.08.052] [Citation(s) in RCA: 15] [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: 10/28/2022]
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Rodrigues L, Raftopoulos KN, Tandrup Schmidt S, Schneider F, Dietz H, Rades T, Franzyk H, Pedersen AE, Papadakis CM, Christensen D, Winter G, Foged C, Hubert M. Immune responses induced by nano-self-assembled lipid adjuvants based on a monomycoloyl glycerol analogue after vaccination with the Chlamydia trachomatis major outer membrane protein. J Control Release 2018; 285:12-22. [PMID: 29964134 DOI: 10.1016/j.jconrel.2018.06.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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: 04/08/2018] [Revised: 06/21/2018] [Accepted: 06/25/2018] [Indexed: 01/31/2023]
Abstract
Nanocarriers based on inverse hexagonal liquid crystalline phases (hexosomes) show promising potential as vaccine delivery systems. Their unique internal structure, composed of both lipophilic domains and water-containing channels, renders them capable of accommodating immunopotentiating compounds and antigens. However, their adjuvant properties are poorly understood. We hypothesized that the supramolecular structure of the lyotropic liquid crystalline phase influences the immunostimulatory activity of lipid-based nanocarriers. To test this, hexosomes were designed containing the lipid phytantriol (Phy) and the immunopotentiator monomycoloyl glycerol-1 (MMG-1). Self-assembly of Phy and MMG-1 into nanocarriers featuring an internal hexagonal phase was confirmed by small-angle X-ray scattering and cryogenic transmission electron microscopy. The effect of the nanostructure on the adjuvant activity was studied by comparing the immunogenicity of Phy/MMG-1 hexosomes with MMG-1-containing lamellar liquid crystalline nanoparticles (liposomes, CAF04). The quality and magnitude of the elicited immune responses were determined after vaccination of CB6/F1 mice using the Chlamydia trachomatis major outer membrane protein (MOMP) as antigen. MMG-1-based hexosomes potentiated significantly stronger MOMP-specific humoral responses than CAF04 liposomes. The liposome-based vaccine formulation induced a much stronger MOMP-specific cell-mediated immune response compared to hexosome-adjuvanted MOMP, which elicited minimal MOMP-specific T-cell stimulation after vaccination. Hence, our data demonstrates that hexosomal and liposomal adjuvants activate the immune system via different mechanisms. Our work provides valuable insights into the adjuvant potential of hexosomes and emphasizes that engineering of the supramolecular structure can be used to design adjuvants with customized immunological properties.
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Affiliation(s)
- Letícia Rodrigues
- Department of Pharmacy, Pharmaceutical Technology and Biopharmacy, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, DE-81377 Munich, Germany
| | - Konstantinos N Raftopoulos
- Physics Department, Soft Matter Physics Group, Technische Universität München, James-Franck-Straße 1, DE-85748 Garching, Germany
| | - Signe Tandrup Schmidt
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark; Department of Infectious Disease Immunology, Vaccine Adjuvant Research, Statens Serum Institut, Artillerivej 5, DK-2300 Copenhagen, Denmark
| | - Fabian Schneider
- Physics Department, Institute for Advanced Study, Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, DE-85748 Garching, Germany
| | - Hendrik Dietz
- Physics Department, Institute for Advanced Study, Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, DE-85748 Garching, Germany
| | - Thomas Rades
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark
| | - Henrik Franzyk
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, DK-2100 Copenhagen Ø, Denmark
| | - Anders Elm Pedersen
- Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, DK-2200 Copenhagen, Denmark
| | - Christine M Papadakis
- Physics Department, Soft Matter Physics Group, Technische Universität München, James-Franck-Straße 1, DE-85748 Garching, Germany
| | - Dennis Christensen
- Department of Infectious Disease Immunology, Vaccine Adjuvant Research, Statens Serum Institut, Artillerivej 5, DK-2300 Copenhagen, Denmark
| | - Gerhard Winter
- Department of Pharmacy, Pharmaceutical Technology and Biopharmacy, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, DE-81377 Munich, Germany
| | - Camilla Foged
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark
| | - Madlen Hubert
- Department of Pharmacy, Pharmaceutical Technology and Biopharmacy, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, DE-81377 Munich, Germany.
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Kehrle J, Purkait TK, Kaiser S, Raftopoulos KN, Winnacker M, Ludwig T, Aghajamali M, Hanzlik M, Rodewald K, Helbich T, Papadakis CM, Veinot JGC, Rieger B. Superhydrophobic Silicon Nanocrystal-Silica Aerogel Hybrid Materials: Synthesis, Properties, and Sensing Application. Langmuir 2018; 34:4888-4896. [PMID: 29606005 DOI: 10.1021/acs.langmuir.7b03746] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Silicon nanocrystals (SiNCs) are abundant and exhibit exquisitely tailorable optoelectronic properties. The incorporation of SiNCs into highly porous and lightweight substrates such as aerogels leads to hybrid materials possessing the attractive features of both materials. This study describes the covalent deposition of SiNCs on and intercalation into silica aerogels, explores the properties, and demonstrates a prototype sensing application of the composite material. SiNCs of different sizes were functionalized with triethoxyvinylsilane (TEVS) via a radical grafting approach and subsequently used for the synthesis of photoluminescent silica hybrids. The resulting SiNC-containing aerogels possess high porosities, SiNC-based size-dependent photoluminescence, transparency, and a superhydrophobic macroscopic surface. The materials were used to examine the photoluminescence response toward low concentrations of 3-nitrotoluene (270 μM), demonstrating their potential as a sensing platform for high-energy materials.
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Affiliation(s)
| | - Tapas K Purkait
- Department of Chemistry , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | | | - Konstantinos N Raftopoulos
- Physik Weicher Materie , Technische Universität München , James-Frank-Str. 1 , 85748 Garching bei München , Germany
| | | | | | - Maryam Aghajamali
- Department of Chemistry , University of Alberta , 11227 Saskatchewan Drive , Edmonton , Alberta T6G 2G2 , Canada
| | | | | | | | - Christine M Papadakis
- Physik Weicher Materie , Technische Universität München , James-Frank-Str. 1 , 85748 Garching bei München , Germany
| | - Jonathan G C Veinot
- Department of Chemistry , University of Alberta , 11227 Saskatchewan Drive , Edmonton , Alberta T6G 2G2 , Canada
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12
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Hebda E, Bukowczan A, Ozimek J, Raftopoulos KN, Wroński S, Tarasiuk J, Pielichowski J, Leszczyńska A, Pielichowski K. Rigid polyurethane foams reinforced with disilanolisobutyl POSS: Synthesis and properties. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4296] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Edyta Hebda
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Krakow Poland
| | - Artur Bukowczan
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Krakow Poland
| | - Jan Ozimek
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Krakow Poland
| | - Konstantinos N. Raftopoulos
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Krakow Poland
| | - Sebastian Wroński
- Faculty of Physics and Applied Computer Science; AGH University of Science and Technology; al. Mickiewicza 30 30-059 Krakow Poland
| | - Jacek Tarasiuk
- Faculty of Physics and Applied Computer Science; AGH University of Science and Technology; al. Mickiewicza 30 30-059 Krakow Poland
| | | | - Agnieszka Leszczyńska
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Krakow Poland
| | - Krzysztof Pielichowski
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Krakow Poland
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13
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Vishnevetskaya NS, Hildebrand V, Dyakonova MA, Niebuur BJ, Kyriakos K, Raftopoulos KN, Di Z, Müller-Buschbaum P, Laschewsky A, Papadakis CM. Dual Orthogonal Switching of the “Schizophrenic” Self-Assembly of Diblock Copolymers. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00096] [Citation(s) in RCA: 30] [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] [Indexed: 01/27/2023]
Affiliation(s)
- Natalya S. Vishnevetskaya
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Viet Hildebrand
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, Germany
| | - Margarita A. Dyakonova
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Bart-Jan Niebuur
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Konstantinos Kyriakos
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Konstantinos N. Raftopoulos
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Zhenyu Di
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at MLZ, Lichtenbergstr. 1, 85747 Garching, Germany
| | - Peter Müller-Buschbaum
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - André Laschewsky
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, Germany
- Fraunhofer Institut
für Angewandte Polymerforschung, Geiselbergstr. 69, 14476 Potsdam-Golm, Germany
| | - Christine M. Papadakis
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
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14
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Niebuur BJ, Claude KL, Pinzek S, Cariker C, Raftopoulos KN, Pipich V, Appavou MS, Schulte A, Papadakis CM. Pressure-Dependence of Poly( N-isopropylacrylamide) Mesoglobule Formation in Aqueous Solution. ACS Macro Lett 2017; 6:1180-1185. [PMID: 35650792 DOI: 10.1021/acsmacrolett.7b00563] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Above their cloud point, aqueous solutions of the thermoresponsive polymer poly(N-isopropylacrylamide) (PNIPAM) form large mesoglobules. We have carried out very small-angle neutron scattering (VSANS with q = 0.21-2.3 × 10-3 Å-1) and Raman spectroscopy experiments on a 3 wt % PNIPAM solution in D2O at atmospheric and elevated pressures (up to 113 MPa). Raman spectroscopy reveals that, at high pressure, the polymer is less dehydrated upon crossing the cloud point. VSANS shows that the mesoglobules are significantly larger and contain more D2O than at atmospheric pressure. We conclude that the size of the mesoglobules and thus their growth process are closely related to the hydration state of PNIPAM.
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Affiliation(s)
- Bart-Jan Niebuur
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Kora-Lee Claude
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Simon Pinzek
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Coleman Cariker
- Department
of Physics and College of Optics and Photonics, University of Central Florida, 2385 Central Florida Boulevard, Orlando, Florida 32816, United States
| | - Konstantinos N. Raftopoulos
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Vitaliy Pipich
- Jülich
Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum
(MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Marie-Sousai Appavou
- Jülich
Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum
(MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Alfons Schulte
- Department
of Physics and College of Optics and Photonics, University of Central Florida, 2385 Central Florida Boulevard, Orlando, Florida 32816, United States
| | - Christine M. Papadakis
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
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15
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Koutsoumpis S, Raftopoulos KN, Oguz O, Papadakis CM, Menceloglu YZ, Pissis P. Dynamic glass transition of the rigid amorphous fraction in polyurethane-urea/SiO 2 nanocomposites. Soft Matter 2017; 13:4580-4590. [PMID: 28590480 DOI: 10.1039/c7sm00397h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report molecular dynamics in the rigid amorphous fraction (RAF) of the polymer bound at the interfaces with nanoparticles in polymer nanocomposites and calculate the glass transition temperature, Tg, for this bound layer of polymer. We follow the '3-phase-model' for semicrystalline polymers where the polymer matrix consists of the crystalline fraction (CF), the mobile amorphous fraction (MAF) and the RAF. While the amorphous polymer bound by crystallites is completely rigid, neither contributing to the glass transition, nor displaying molecular dynamics, the amorphous polymer bound at the interfaces with filler displays decelerated dynamics, as compared to the bulk polymer. Reports in the literature suggest a discrepancy between Tg values obtained by Differential Scanning Calorimetry (DSC) and by Dielectric Relaxation Spectroscopy (DRS). As a plausible explanation we suggest that DRS results in Tg values taking into account the bound polymer, whereas DSC does not. For this investigation we use semicrystalline polyurethane-urea/SiO2 nanocomposites and employ, next to DSC and DRS, SEM, SAXS and WAXS for morphological characterization. It is our intention to use DRS as a tool for investigating the RAF.
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Affiliation(s)
- Stefanos Koutsoumpis
- National Technical University of Athens, Heroon Polytechniou 9, 15780 Zografou, Greece.
| | - Konstantinos N Raftopoulos
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany and Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
| | - Oguzhan Oguz
- Faculty of Engineering and Natural Sciences, Materials Science and Nano Engineering, Sabanci University, 34956, Tuzla, Istanbul, Turkey and Sabanci University Integrated Manufacturing Technologies Research and Application Center & Composite Technologies Center of Excellence, Teknopark Istanbul, 34906, Pendik, Istanbul, Turkey
| | - Christine M Papadakis
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Yusuf Z Menceloglu
- Faculty of Engineering and Natural Sciences, Materials Science and Nano Engineering, Sabanci University, 34956, Tuzla, Istanbul, Turkey and Sabanci University Integrated Manufacturing Technologies Research and Application Center & Composite Technologies Center of Excellence, Teknopark Istanbul, 34906, Pendik, Istanbul, Turkey
| | - Polycarpos Pissis
- National Technical University of Athens, Heroon Polytechniou 9, 15780 Zografou, Greece.
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16
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Affiliation(s)
- Daniel Moseguí González
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie; Physik-Department; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
| | - Konstantinos N. Raftopoulos
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie; Physik-Department; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
| | - Gang He
- Department of Chemistry; University of Alberta; 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Christine M. Papadakis
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie; Physik-Department; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
| | - Alex Brown
- Department of Chemistry; University of Alberta; 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Eric Rivard
- Department of Chemistry; University of Alberta; 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie; Physik-Department; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
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17
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Dyakonova MA, Gotzamanis G, Niebuur BJ, Vishnevetskaya NS, Raftopoulos KN, Di Z, Filippov SK, Tsitsilianis C, Papadakis CM. pH Responsiveness of hydrogels formed by telechelic polyampholytes. Soft Matter 2017; 13:3568-3579. [PMID: 28443918 DOI: 10.1039/c7sm00315c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We investigate the influence of pH on the rheological and structural properties of hydrogels formed by hydrophobic association of the sticky ends of the triblock terpolymer poly(methyl methacrylate)-b-poly(2-(diethylamino)ethyl methacrylate-co-methacrylic acid)-b-poly(methyl methacrylate) (PMMA-b-P(DEA-co-MAA)-b-PMMA). The middle block is a weak polyampholyte having a pH dependent charge density and sign, which enables tuning of the rheological and structural properties by pH variation. Small-angle neutron scattering (SANS) studies of solutions in D2O at 0.05 wt% and pH 3.0 reveal clusters of interconnected spherical micelles having PMMA cores, stabilized by repulsive ionic interactions in the middle polyampholyte block. With increasing pH, the degree of ionization of the DEA units decreases, whereas the one of the MAA units increases, resulting in a complete loss of the correlation between these micelles. At a concentration of 3 wt% at low pH values, the system forms a gel with charged fuzzy spheres from PMMA interacting via a screened Coulomb potential. With increasing pH, the gel disintegrates due to the decrease in the effective charge on the micelles. At both concentrations, the hydrophobic aggregation of micelles is observed near the isoelectric point. At pH 3.0-7.4, the autocorrelation functions measured by rotational dynamic light scattering at 3 wt% exhibit a decay steeper than single exponential, which confirms that the gels are frozen, presumably due to the glassy PMMA cores and hydrophobic interpolyelectrolyte complexes. At pH 11, the diffusion of single micelles is observed in addition to the frozen dynamics.
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Affiliation(s)
- Margarita A Dyakonova
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany.
| | - George Gotzamanis
- Department of Chemical Engineering, University of Patras, 26504 Patras, Greece.
| | - Bart-Jan Niebuur
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Natalya S Vishnevetskaya
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Konstantinos N Raftopoulos
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Zhenyu Di
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstr. 1, 85747 Garching, Germany
| | - Sergey K Filippov
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v. v. i., Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic
| | | | - Christine M Papadakis
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany.
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18
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González DM, Raftopoulos KN, He G, Papadakis CM, Brown A, Rivard E, Müller-Buschbaum P. Bandgap-Tuning in Triple-Chalcogenophene Polymer Films by Thermal Annealing. Macromol Rapid Commun 2017; 38. [DOI: 10.1002/marc.201700065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 02/22/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Daniel Moseguí González
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie; Physik-Department; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
| | - Konstantinos N. Raftopoulos
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie; Physik-Department; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
| | - Gang He
- Department of Chemistry; University of Alberta; 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Christine M. Papadakis
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie; Physik-Department; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
| | - Alex Brown
- Department of Chemistry; University of Alberta; 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Eric Rivard
- Department of Chemistry; University of Alberta; 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie; Physik-Department; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
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19
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Koutsoumpis S, Raftopoulos KN, Jancia M, Pagacz J, Hebda E, Papadakis CM, Pielichowski K, Pissis P. POSS Moieties with PEG Vertex Groups as Diluent in Polyurethane Elastomers: Morphology and Phase Separation. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01394] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Stefanos Koutsoumpis
- Department
of Physics, National Technical University of Athens, Zografou Campus, 157 80 Athens, Greece
| | - Konstantinos N. Raftopoulos
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul.Warszawska 24, 31-155 Kraków, Poland
- Physik-Department,
Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Małgorzata Jancia
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul.Warszawska 24, 31-155 Kraków, Poland
| | - Joanna Pagacz
- Wroclaw Research
Centre EIT+, ul. Stablowicka 147, 54-066 Wroclaw, Poland
| | - Edyta Hebda
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul.Warszawska 24, 31-155 Kraków, Poland
| | - Christine M. Papadakis
- Physik-Department,
Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Krzysztof Pielichowski
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul.Warszawska 24, 31-155 Kraków, Poland
| | - Polycarpos Pissis
- Department
of Physics, National Technical University of Athens, Zografou Campus, 157 80 Athens, Greece
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20
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Kripotou S, Psylla C, Kyriakos K, Raftopoulos KN, Zhao J, Zhang G, Pispas S, Papadakis CM, Kyritsis A. Structure and Crystallization Behavior of Poly(ethylene oxide) (PEO) Chains in Core–Shell Brush Copolymers with Poly(propylene oxide)-block-poly(ethylene oxide) Side Chains. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00879] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Sotiria Kripotou
- Physics
Department, National Technical University of Athens, Iroon Polytechneiou
9, Zografou Campus, Athens 15780, Greece
| | - Christina Psylla
- Physik-Department,
Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, Garching 85748, Germany
| | - Konstantinos Kyriakos
- Physik-Department,
Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, Garching 85748, Germany
| | - Konstantinos N. Raftopoulos
- Physik-Department,
Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, Garching 85748, Germany
| | - Junpeng Zhao
- Faculty
of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China
| | - Guangzhao Zhang
- Faculty
of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China
| | - Stergios Pispas
- Theoretical
and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vass. Constantinou Ave., Athens 11635, Greece
| | - Christine M. Papadakis
- Physik-Department,
Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, Garching 85748, Germany
| | - Apostolos Kyritsis
- Physics
Department, National Technical University of Athens, Iroon Polytechneiou
9, Zografou Campus, Athens 15780, Greece
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21
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Campanella A, Holderer O, Raftopoulos KN, Papadakis CM, Staropoli MP, Appavou MS, Müller-Buschbaum P, Frielinghaus H. Multi-stage freezing of HEUR polymer networks with magnetite nanoparticles. Soft Matter 2016; 12:3214-3225. [PMID: 26924466 DOI: 10.1039/c6sm00074f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We observe a change in the segmental dynamics of hydrogels based on hydrophobically modified ethoxylated urethanes (HEUR) when hydrophobic magnetite nanoparticles (MNPs) are embedded in the hydrogels. The dynamics of the nanocomposite hydrogels is investigated using dielectric relaxation spectroscopy (DRS) and neutron spin echo (NSE) spectroscopy. The magnetic nanoparticles within the hydrophobic domains of the HEUR polymer network increase the size of these domains and their distance. The size increase leads to a dilution of the polymers close to the hydrophobic domain, allowing higher mobility of the smallest polymer blobs close to the "center". This is reflected in the decrease of the activation energy of the β-process detected in the DRS data. The increase in distance leads to an increase of the size of the largest hydrophilic polymer blobs. Therefore, the segmental dynamics of the largest blobs is slowed down. At short time scales, i.e. 10(-9) s < τ < 10(-3) s, the suppression of the segmental dynamics is reflected in the α-relaxation processes detected in the DRS data and in the decrease of the relaxation rate Γ of the segmental motion in the NSE data with increasing concentration of magnetic nanoparticles. The stepwise (multi-stage) freezing of the small blobs is only visible for the pure hydrogel at low temperatures. On the other hand, the glass transition temperature (Tg) decreases upon increasing the MNP loading, indicating an acceleration of the segmental dynamics at long time scales (τ∼ 100 s). Therefore, it would be possible to tune the Tg of the hydrogels by varying the MNP concentration. The contribution of the static inhomogeneities to the total scattering function Sst(q) is extracted from the NSE data, revealing a more ordered gel structure than the one giving rise to the total scattering function S(q), with a relaxed correlation length ξNSE = (43 ± 5) Å which is larger than the fluctuating correlation length from a static investigation ξSANS = (17.2 ± 0.3) Å.
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Affiliation(s)
- A Campanella
- JCNS@FRMII, Lichtenbergstraße 1, 85747 Garching, Germany.
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22
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23
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Grübel M, Meister S, Schulze U, Raftopoulos KN, Baumer F, Papadakis CM, Nilges T, Rieger B. Synthesis of Diisocyanate-Containing Thiophenes and Their Use in PDMS-Based Segmented Polymers. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201500289] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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)
- Matthias Grübel
- WACKER-Lehrstuhl für Makromolekulare Chemie; Technische Universität München; Lichtenbergstr 4 85747 Garching Germany
| | - Simon Meister
- WACKER-Lehrstuhl für Makromolekulare Chemie; Technische Universität München; Lichtenbergstr 4 85747 Garching Germany
| | - Ulrich Schulze
- WACKER-Lehrstuhl für Makromolekulare Chemie; Technische Universität München; Lichtenbergstr 4 85747 Garching Germany
| | | | - Franziska Baumer
- Arbeitskreis für Synthese und Charakterisierung innovativer Materialien; Technische Universität München; Lichtenbergstr. 4 85747 Garching Germany
| | - Christine M. Papadakis
- Fachgebiet Physik weicher Materie; Technische Universität München; James-Franck-Str. 85748 Garching Germany
| | - Tom Nilges
- Arbeitskreis für Synthese und Charakterisierung innovativer Materialien; Technische Universität München; Lichtenbergstr. 4 85747 Garching Germany
| | - Bernhard Rieger
- WACKER-Lehrstuhl für Makromolekulare Chemie; Technische Universität München; Lichtenbergstr 4 85747 Garching Germany
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24
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Hebda E, Ozimek J, Raftopoulos KN, Michałowski S, Pielichowski J, Jancia M, Pielichowski K. Synthesis and morphology of rigid polyurethane foams with POSS as pendant groups or chemical crosslinks. POLYM ADVAN TECHNOL 2015. [DOI: 10.1002/pat.3504] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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)
- Edyta Hebda
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Kraków Poland
| | - Jan Ozimek
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Kraków Poland
| | - Konstantinos N. Raftopoulos
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Kraków Poland
- Physik-Department, Fachgebiet Physik weicher Materie; Technische Universität München; James-Franck-Str. 1 85748 Garching Germany
| | - Sławomir Michałowski
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Kraków Poland
| | - Jan Pielichowski
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Kraków Poland
| | - Małgorzata Jancia
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Kraków Poland
| | - Krzysztof Pielichowski
- Department of Chemistry and Technology of Polymers; Cracow University of Technology; ul. Warszawska 24 31-155 Kraków Poland
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25
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Raftopoulos KN, Koutsoumpis S, Jancia M, Lewicki JP, Kyriakos K, Mason HE, Harley SJ, Hebda E, Papadakis CM, Pielichowski K, Pissis P. Reduced Phase Separation and Slowing of Dynamics in Polyurethanes with Three-Dimensional POSS-Based Cross-Linking Moieties. Macromolecules 2015. [DOI: 10.1021/ma5023132] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Konstantinos N. Raftopoulos
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
| | - Stefanos Koutsoumpis
- Department
of Physics, National Technical University of Athens, Iroon Polytechneiou 9, Zografou
Campus, 157 80, Athens, Greece
| | - Małgorzata Jancia
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
| | - James P. Lewicki
- Lawrence Livermore
National Laboratory, 7000 East Ave., Livermore, California 94550, United States
| | - Konstantinos Kyriakos
- Physik-Department,
Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Harris E. Mason
- Lawrence Livermore
National Laboratory, 7000 East Ave., Livermore, California 94550, United States
| | - Stephen J. Harley
- Lawrence Livermore
National Laboratory, 7000 East Ave., Livermore, California 94550, United States
| | - Edyta Hebda
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
| | - Christine M. Papadakis
- Physik-Department,
Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Krzysztof Pielichowski
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
| | - Polycarpos Pissis
- Department
of Physics, National Technical University of Athens, Iroon Polytechneiou 9, Zografou
Campus, 157 80, Athens, Greece
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Raftopoulos KN, Jancia M, Aravopoulou D, Hebda E, Pielichowski K, Pissis P. POSS along the Hard Segments of Polyurethane. Phase Separation and Molecular Dynamics. Macromolecules 2013. [DOI: 10.1021/ma401417t] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Konstantinos N. Raftopoulos
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul.
Warszawska 24, 31-155 Kraków, Poland
- Department
of Physics, National Technical University of Athens, Iroon Polytechneiou 9, Zografou
Campus, 157 80, Athens, Greece
| | - Małgorzata Jancia
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul.
Warszawska 24, 31-155 Kraków, Poland
| | - Dionysia Aravopoulou
- Department
of Physics, National Technical University of Athens, Iroon Polytechneiou 9, Zografou
Campus, 157 80, Athens, Greece
| | - Edyta Hebda
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul.
Warszawska 24, 31-155 Kraków, Poland
| | - Krzysztof Pielichowski
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul.
Warszawska 24, 31-155 Kraków, Poland
| | - Polycarpos Pissis
- Department
of Physics, National Technical University of Athens, Iroon Polytechneiou 9, Zografou
Campus, 157 80, Athens, Greece
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27
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Kyriakos K, Raftopoulos KN, Pissis P, Kyritsis A, Näther F, Häußler L, Fischer D, Vyalikh A, Scheler U, Reuter U, Pospiech D. Dielectric and thermal studies of the segmental dynamics of poly(methyl methacrylate)/silica nanocomposites prepared by the sol-gel method. J Appl Polym Sci 2012. [DOI: 10.1002/app.38599] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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