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Li S, Zhi L, Chen Q, Zhao W, Zhao C. Reversibly Adhesive, Anti-Swelling, and Antibacterial Hydrogels for Tooth-Extraction Wound Healing. Adv Healthc Mater 2024; 13:e2400089. [PMID: 38354105 DOI: 10.1002/adhm.202400089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 02/11/2024] [Indexed: 02/16/2024]
Abstract
Oral wound treatment faces challenges due to the complex oral environment, thus, sealing the wound quickly becomes necessary. Although some materials have achieved adhesion and sterilization, how to effectively solve the contradiction between strong adhesion and on-demand removal remains a challenge. Herein, a reversibly adhesive hydrogel is designed by free radical copolymerization of cationic monomer [2-(acryloyloxy) ethyl] trimethylammonium chloride (ATAC), hydrophobic monomer ethylene glycol phenyl ether acrylate (PEA) and N-isopropylacrylamide (NIPAAm). The cationic quaternary ammonium salts provide electrostatic interactions, the hydrophobic groups provide hydrophobic interactions, and the PNIPAAm chain segments provide hydrogen bonding, leading to strong adhesion. Therefore, the hydrogel obtains an adhesion strength of 18.67 KPa to oral mucosa and can seal wounds fast within 10 s. Furthermore, unlike pure PNIPAAm, the hydrogel has a lower critical solution temperature of 40.3 °C due to the contribution of ATAC and PEA, enabling rapid removal with 40 °C water after treatment. In addition, the hydrogel realizes excellent anti-swelling ratio (≈80%) and antibacterial efficiency (over 90%). Animal experiments prove that the hydrogel effectively reduces inflammation infiltration, promotes collagen deposition and vascular regeneration. Thus, hydrogel as a multi-functional dressing has great application prospects in oral wound management.
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Affiliation(s)
- Siyu Li
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China
| | - Lunhao Zhi
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China
| | - Qin Chen
- Department of Nursing, West China Hospital, Sichuan University, Chengdu, 610041, P. R. China
| | - Weifeng Zhao
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China
| | - Changsheng Zhao
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China
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2
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Antioxidant ability and increased mechanical stability of hydrogel nanocomposites based on N-isopropylacrylamide crosslinked with Laponite and modified with polydopamine. Eur Polym J 2023. [DOI: 10.1016/j.eurpolymj.2023.111876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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3
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Reitenbach J, Geiger C, Wang P, Vagias A, Cubitt R, Schanzenbach D, Laschewsky A, Papadakis CM, Müller-Buschbaum P. Effect of Magnesium Salts with Chaotropic Anions on the Swelling Behavior of PNIPMAM Thin Films. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Julija Reitenbach
- TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Christina Geiger
- TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Peixi Wang
- TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Apostolos Vagias
- Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Robert Cubitt
- Institut Laue-Langevin, 6 rue Jules Horowitz, 38000 Grenoble, France
| | - Dirk Schanzenbach
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
| | - André Laschewsky
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
- Fraunhofer Institut für Angewandte Polymerforschung, Geiselbergstr. 69, 14476 Potsdam-Golm, Germany
| | - Christine M. Papadakis
- TUM School of Natural Sciences, Department of Physics, Fachgebiet Physik weicher Materie, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
| | - Peter Müller-Buschbaum
- TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
- Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich, Lichtenbergstr. 1, 85748 Garching, Germany
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Double Stimuli-Responsive di- and Triblock Copolymers of Poly(N-isopropylacrylamide) and Poly(1-vinylimidazole): Synthesis and Self-Assembly. Int J Mol Sci 2023; 24:ijms24010879. [PMID: 36614322 PMCID: PMC9820948 DOI: 10.3390/ijms24010879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 12/25/2022] [Accepted: 12/26/2022] [Indexed: 01/05/2023] Open
Abstract
For the first time, double stimuli-responsive properties of poly(N-isopropylacrylamide) (PNIPA) and poly(1-vinylimidazole) (PVIM) block copolymers in aqueous solutions were studied. The synthesis of PNIPA60-b-PVIM90 and PNIPA28-b-PVIM62-b-PNIPA29 was performed using reversible addition-fragmentation chain transfer (RAFT) polymerization. The polymers were characterized by size exclusion chromatography and 1H NMR spectroscopy. The conformational behavior of the polymers was studied using dynamic light scattering (DLS) and fluorescence spectroscopy (FS). It was found that PNIPA and block copolymers conformation and ability for self-assembly in aqueous medium below and above cloud point temperature depend on the locus of hydrophobic groups derived from the RAFT agent within the chain. Additionally, the length of PVIM block, its locus in the chain and charge perform an important role in the stabilization of macromolecular micelles and aggregates below and above cloud point temperature. At 25 °C the average hydrodynamic radius (Rh) of the block copolymer particles at pH 3 is lower than at pH 9 implying the self-assembling of macromolecules in the latter case. Cloud points of PNIPA60-b-PVIM90 are ~43 °C and ~37 °C at a pH of 3 and 9 and of PNIPA28-b-PVIM62-b-PNIPA29 they are ~35 °C and 31 °C at a pH of 3 and 9. Around cloud point independently of pH, the Rh value for triblock copolymer rises sharply, achieves the maximum value, then falls and reaches the constant value, while for diblock copolymer, it steadily grows after reaching cloud point. The information about polarity of microenvironment around polymer obtained by FS accords with DLS data.
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Theodorou A, Gounaris D, Voutyritsa E, Andrikopoulos N, Baltzaki CIM, Anastasaki A, Velonia K. Rapid Oxygen-Tolerant Synthesis of Protein-Polymer Bioconjugates via Aqueous Copper-Mediated Polymerization. Biomacromolecules 2022; 23:4241-4253. [PMID: 36067415 DOI: 10.1021/acs.biomac.2c00726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of protein-polymer conjugates usually requires extensive and costly deoxygenation procedures, thus limiting their availability and potential applications. In this work, we report the ultrafast synthesis of polymer-protein bioconjugates in the absence of any external deoxygenation via an aqueous copper-mediated methodology. Within 10 min and in the absence of any external stimulus such as light (which may limit the monomer scope and/or disrupt the secondary structure of the protein), a range of hydrophobic and hydrophilic monomers could be successfully grafted from a BSA macroinitiator, yielding well-defined polymer-protein bioconjugates at quantitative yields. Our approach is compatible with a wide range of monomer classes such as (meth) acrylates, styrene, and acrylamides as well as multiple macroinitiators including BSA, BSA nanoparticles, and beta-galactosidase from Aspergillus oryzae. Notably, the synthesis of challenging protein-polymer-polymer triblock copolymers was also demonstrated, thus significantly expanding the scope of our strategy. Importantly, both lower and higher scale polymerizations (from 0.2 to 35 mL) were possible without compromising the overall efficiency and the final yields. This simple methodology paves the way for a plethora of applications in aqueous solutions without the need of external stimuli or tedious deoxygenation.
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Affiliation(s)
- Alexis Theodorou
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
| | - Dimitris Gounaris
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
| | - Errika Voutyritsa
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
| | - Nicholas Andrikopoulos
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
| | | | | | - Kelly Velonia
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
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Huang D, Gao S, Luo Y, Zhou X, Lu Z, Zou L, Hu K, Zhao Z, Zhang Y. Glucose-sensitive membrane with phenylboronic acid-based contraction-type microgels as chemical valves. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Su T, Sun Y, Han L, Cai W, Shao X. Revealing the interactions of water with cryoprotectant and protein by near-infrared spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 266:120417. [PMID: 34600324 DOI: 10.1016/j.saa.2021.120417] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 09/03/2021] [Accepted: 09/19/2021] [Indexed: 06/13/2023]
Abstract
Taking formamide (FA) as a model compound of protein, the water structure in the ternary mixtures of dimethyl sulfoxide (DMSO)-water-FA was studied by near-infrared (NIR) spectroscopy. The interaction of DMSO and water, and the effect of FA on the interaction, were analyzed with the help of chemometric methods. Continuous wavelet transform (CWT) was used to enhance the resolution of the spectra. A peak at 6437 cm-1 depicting the interaction of DMSO and water through hydrogen bonding (SO…HO) was observed in the transformed spectra. When FA exists in the mixture, the intensity of the peak decreases with the increase of formamide content, showing that FA may replace the water to form the hydrogen bond of SO and HN. In addition, temperature-dependent NIR spectroscopy was used to analyze the effect of the three components on the spectral variation with temperature. Analyzing the spectral data by alternating trilinear decomposition (ATLD) and multiple linear regression, two varying spectral features were obtained that are related to water and DMSO, but no spectral feature was found that significantly varies with the content of FA. The result implies that DMSO is still the key component to prevent the water from icing, although FA may reduce slightly the anti-freezing effect.
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Affiliation(s)
- Tao Su
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin Key Laboratory of Biosensing and Molecular Recognition, State Key Laboratory of Medicinal Chemical Biology, Tianjin 300071, PR China
| | - Yan Sun
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin Key Laboratory of Biosensing and Molecular Recognition, State Key Laboratory of Medicinal Chemical Biology, Tianjin 300071, PR China
| | - Li Han
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin Key Laboratory of Biosensing and Molecular Recognition, State Key Laboratory of Medicinal Chemical Biology, Tianjin 300071, PR China
| | - Wensheng Cai
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin Key Laboratory of Biosensing and Molecular Recognition, State Key Laboratory of Medicinal Chemical Biology, Tianjin 300071, PR China
| | - Xueguang Shao
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin Key Laboratory of Biosensing and Molecular Recognition, State Key Laboratory of Medicinal Chemical Biology, Tianjin 300071, PR China.
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Williams RJ, Crapnell RD, Dempsey NC, Peeters M, Banks CE. Nano-molecularly imprinted polymers for serum creatinine sensing using the Heat Transfer Method. TALANTA OPEN 2022. [DOI: 10.1016/j.talo.2022.100087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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9
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Chou PM, Khiew PS, Brown PD, Hu B. Development of Thermally Responsive PolyNIPAm Microcarrier for Application of Cell Culturing-Part I: A Feasibility Study. Polymers (Basel) 2021; 13:polym13162629. [PMID: 34451170 PMCID: PMC8400069 DOI: 10.3390/polym13162629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 07/29/2021] [Accepted: 08/02/2021] [Indexed: 11/16/2022] Open
Abstract
Poly(N-isopropylacrylamide) (polyNIPAm) microspheres were synthesized via the suspension polymerization technique. Thermal and redox initiators were compared for the polymerization, in order to study the effect of initiator type on the surface charge and particle size of polyNIPAm microspheres. The successful polymerization of NIPAm was confirmed by FTIR analysis. Microspheres of diameter >50 µm were synthesized when a pair of ammonium persulfate (APS) and N,N,N',N'-tetramethylene-diamine (TEMED) redox initiators was used, whilst relatively small microspheres of ~1 µm diameter were produced using an Azobis-isobutyronitrile (AIBN) thermal initiator. Hence, suspension polymerization using a redox initiator pair was found to be more appropriate for the synthesis of polyNIPAm microspheres of a size suitable for human embryonic kidney (HEK) cell culturing. However, the zeta potential of polyNIPAm microspheres prepared using an APS/TEMED redox initiator was significantly more negative than AIBN thermal initiator prepared microspheres and acted to inhibit cell attachment. Conversely, strong cell attachment was observed in the case of polyNIPAm microspheres of diameter ~90 µm, prepared using an APS/TEMED redox initiator in the presence of a cetyl trimethyl ammonium bromide (CTAB) cationic surfactant; demonstrating that surface charge modified polyNIPAm microspheres have great potential for use in cell culturing.
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Affiliation(s)
- Pui May Chou
- School of Computer Science and Engineering, Faculty of Innovation and Technology, Taylor’s University Lakeside Campus, No. 1, Jalan Taylor’s, Subang Jaya 47500, Selangor, Malaysia
- Correspondence: (P.M.C.); (B.H.)
| | - Poi Sim Khiew
- Center of Nanotechnology and Advanced Materials, Faculty of Science and Engineering, University of Nottingham Malaysia Campus, Jalan Broga, Semenyih 43500, Selangor, Malaysia;
| | - Paul D Brown
- Department of Mechanical, Materials & Manufacturing Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK;
| | - Binjie Hu
- Department of Chemical and Environmental Engineering, University of Nottingham China, 199 Taikang East Road, Ningbo 315100, China
- Correspondence: (P.M.C.); (B.H.)
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10
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Ma B, Wang L, Han L, Cai W, Shao X. Understanding the effect of urea on the phase transition of poly(N-isopropylacrylamide) in aqueous solution by temperature-dependent near-infrared spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 253:119573. [PMID: 33618264 DOI: 10.1016/j.saa.2021.119573] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 01/06/2021] [Accepted: 01/29/2021] [Indexed: 06/12/2023]
Abstract
Regulating the folding state by denaturants is essential for the structure and function of proteins. Poly(N-isopropyl acrylamide) (PNIPAM) is usually regarded as a model for protein denaturation. The effects of urea, as a denaturant, on the aggregations of PNIPAM was studied by temperature-dependent near-infrared (NIR) spectroscopy, and particularly the variation of water structures was analyzed. The NIR spectra of the polymer-urea solutions containing different polymer concentrations were measured at different temperatures. N-way principal component analysis (NPCA) was performed to observe the spectral information. Three principal components (PCs) containing the spectral information of CH groups were obtained, showing three kinds of CH in the system. Obvious dehydration of the three CH groups occurs at 27.5 °C in solution, but the temperature turns to 27 °C for two kinds of the CH and 26.5 °C for the third one, respectively, in the urea-add solution. The effect of urea on the formation of the intramolecular hydrogen bonds that promotes polymer folding is suggested. The spectral information of NH in urea molecule indicates that the direct interaction of urea and polymer facilitates the stability of the polymer globule state. Furthermore, the spectral information of OH shows that the release of the water molecules with three hydrogen bonds (S3), which may connect the NH and CO groups in PNIPAM in solution, leads to the phase transition. When urea is added, urea may reduce the content of the S3 water to facilitate the release, making the phase transition at a low temperature.
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Affiliation(s)
- Biao Ma
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, PR China
| | - Li Wang
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, PR China
| | - Li Han
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, PR China
| | - Wensheng Cai
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory of Biosensing and Molecular Recognition, Tianjin 300071, PR China
| | - Xueguang Shao
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory of Biosensing and Molecular Recognition, Tianjin 300071, PR China; State Key Laboratory of Medicinal Chemical Biology, Tianjin 300071, PR China.
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11
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Park Y, Hwang M, Kim M, Park E, Noda I, Jung YM. Characterization of the phase transition mechanism of P(NiPAAm-co-AAc) copolymer hydrogel using 2D correlation IR spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 252:119525. [PMID: 33582435 DOI: 10.1016/j.saa.2021.119525] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 01/09/2021] [Accepted: 01/21/2021] [Indexed: 06/12/2023]
Abstract
A thermo-responsive polymer, poly(N-isopropylacrylamide) (PNiPAAm), was copolymerized with acrylic acid (AAc) in this study. Its phase transitions during the heating and cooling processes were investigated using IR spectroscopy, principal component analysis (PCA), and two-dimensional correlation spectroscopy (2D-COS). During the heating process, the hydrogen bonding between side chain in P(NiPAAm-co-AAc) copolymer hydrogel and H2O was broken first, and then the formation of the intramolecular interaction in P(NiPAAm-co-AAc) copolymer hydrogel occurred. However, unlike the heating process, intensities of bands in the CH stretching region were changed before those in the CO stretching including the NH bending region during the cooling process. The results indicate that the phase transition of P(NiPAAm-co-AAc) copolymer hydrogel is an irreversible process at the molecular levels.
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Affiliation(s)
- Yeonju Park
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Myeongwon Hwang
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Minkyoung Kim
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Eungyeong Park
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Isao Noda
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA
| | - Young Mee Jung
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Republic of Korea; Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea.
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Niebuur BJ, Lohstroh W, Ko CH, Appavou MS, Schulte A, Papadakis CM. Pressure Dependence of Water Dynamics in Concentrated Aqueous Poly( N-isopropylacrylamide) Solutions with a Methanol Cosolvent. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00111] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bart-Jan Niebuur
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Wiebke Lohstroh
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Chia-Hsin Ko
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 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, 4111 Libra Drive, Orlando, Florida 32816-2385, 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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Thiele S, Andersson J, Dahlin A, Hailes RLN. Tuning the Thermoresponsive Behavior of Surface-Attached PNIPAM Networks: Varying the Crosslinker Content in SI-ATRP. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3391-3398. [PMID: 33719454 PMCID: PMC8041372 DOI: 10.1021/acs.langmuir.0c03545] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/24/2021] [Indexed: 06/12/2023]
Abstract
The synthesis and thermoresponsive properties of surface-attached poly(N-isopropylacrylamide)-co-N,N'-methylene bisacrylamide (PNIPAM-co-MBAM) networks are investigated. The networks are formed via SI-ARGET-ATRP ("grafting-from") on thiol-based initiator-functionalized gold films. This method is reliable, well controlled, fast, and applicable to patterned surfaces (e.g., nanopores) for networks with dry thicknesses >20 nm. Surface-attached PNIPAM-co-MBAM gels are swollen below their volume phase transition temperature but above collapse without complete expulsion of water (retain ∼50 vol %). The swelling/collapse transition is studied using complementary SPR and QCMD techniques. The ratio between swollen and collapsed heights characterizes the thermoresponsive behavior and is shown to not depend on network height but to vary with MBAM content. The higher the proportion of the crosslinker, the lower the magnitude of the phase transition, until all responsiveness is lost at 5 mol % MBAM. The temperature range of the transition is broadened for more crosslinked PNIPAM-co-MBAM gels but remains centered around 32 °C. Upon reswelling, less crosslinked networks display sharp transitions, while for those containing ≥3 mol % MBAM, transitions remain broad. This tunable behavior persists for gels on nanostructured gold surfaces. Investigating PNIPAM-co-MBAM networks on gold plasmonic nanowell arrays is a starting point for expanding their scope as thermo-controlled nanoactuators.
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Ko CH, Claude KL, Niebuur BJ, Jung FA, Kang JJ, Schanzenbach D, Frielinghaus H, Barnsley LC, Wu B, Pipich V, Schulte A, Müller-Buschbaum P, Laschewsky A, Papadakis CM. Temperature-Dependent Phase Behavior of the Thermoresponsive Polymer Poly(N-isopropylmethacrylamide) in an Aqueous Solution. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01256] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Chia-Hsin Ko
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Kora-Lee Claude
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Bart-Jan Niebuur
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Florian A. Jung
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Jia-Jhen Kang
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Dirk Schanzenbach
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, Germany
| | - Henrich Frielinghaus
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Lester C. Barnsley
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, 85748 Garching, Germany
- Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton 3168, Australia
| | - Baohu Wu
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Vitaliy Pipich
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Alfons Schulte
- Department of Physics and College of Optics and Photonics, University of Central Florida, 4111 Libra Drive, Orlando, Florida 32816-2385, United States
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstraße 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, Geiselbergstraße 69, 14476 Potsdam-Golm, Germany
| | - Christine M. Papadakis
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
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16
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Zhou J, Heng Z, Wu H, Zhang H, Chen Y, Zhou S, Zou H, Liang M. Preparation of Damping Structural Integrated Epoxy Resin via “Rigid-Structure Dilution” and the Study on Dangling Chains Involved Segment Interactions. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b05283] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ji Zhou
- The State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, 610065 Chengdu, China
| | - Zhengguang Heng
- The State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, 610065 Chengdu, China
| | - Hang Wu
- Beijing Special Vehicle Institute, 100072 Beijing, China
| | - Haoruo Zhang
- The State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, 610065 Chengdu, China
| | - Yang Chen
- The State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, 610065 Chengdu, China
| | - Shengtai Zhou
- The State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, 610065 Chengdu, China
| | - Huawei Zou
- The State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, 610065 Chengdu, China
| | - Mei Liang
- The State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, 610065 Chengdu, China
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17
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Radu IC, Biru IE, Damian CM, Ion AC, Iovu H, Tanasa E, Zaharia C, Galateanu B. Grafting versus Crosslinking of Silk Fibroin-g-PNIPAM via Tyrosine-NIPAM Bridges. Molecules 2019; 24:molecules24224096. [PMID: 31766195 PMCID: PMC6891396 DOI: 10.3390/molecules24224096] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 11/04/2019] [Accepted: 11/08/2019] [Indexed: 11/20/2022] Open
Abstract
This paper reports the synthesis and complex characterization of novel polymeric networks based on the crosslinking of Bombyx mori silk fibroin via poly(N-isopropylacrylamide) bridges generated by an ammonium cerium nitrate redox system. The research study gives an understanding of the polymerization mechanism in terms of the generation of radical sites, radical growth and termination reaction, as well as the involvement of modifications on silk fibroin structure and properties. The physico-chemical characterization was carried out by FTIR-ATR, X-ray photoelectron spectroscopy and RAMAN spectroscopy with unravelling the chemical modification. The structural characterization and spatial arrangement by secondary structure were carried out by X-ray diffraction and circular dichroism. The thermal behavior and thermal stability were evaluated by differential scanning calorimetry and thermogravimetric analysis. The novel complex polymer network is intended to be used in the field of smart drug delivery systems.
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Affiliation(s)
- Ionut-Cristian Radu
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Iuliana-Elena Biru
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Celina-Maria Damian
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Andreea-Cristina Ion
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Horia Iovu
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Eugenia Tanasa
- Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 011061 Bucharest, Romania;
| | - Catalin Zaharia
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
- Correspondence: ; Tel.: +40-727-694-492
| | - Bianca Galateanu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 050095 Bucharest, Romania;
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18
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Giaouzi D, Pispas S. Synthesis and self‐assembly of thermoresponsive poly(
N
‐isopropylacrylamide)‐
b
‐poly(oligo ethylene glycol methyl ether acrylate) double hydrophilic block copolymers. ACTA ACUST UNITED AC 2019. [DOI: 10.1002/pola.29411] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Despoina Giaouzi
- Theoretical and Physical Chemistry InstituteNational Hellenic Research Foundation 48 Vassileos Constantinou Avenue, Athens 11635 Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry InstituteNational Hellenic Research Foundation 48 Vassileos Constantinou Avenue, Athens 11635 Greece
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19
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Wang L, Zhu X, Cai W, Shao X. Understanding the role of water in the aggregation of poly(N,N-dimethylaminoethyl methacrylate) in aqueous solution using temperature-dependent near-infrared spectroscopy. Phys Chem Chem Phys 2019; 21:5780-5789. [PMID: 30801574 DOI: 10.1039/c8cp07153e] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
For understanding the role of water in the aggregation of polymers, the variation of water structures with the structural change of polymers in the process of aggregation was studied by temperature-dependent near-infrared (NIR) spectroscopy. The NIR spectra of the aqueous poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) solutions of different concentrations were measured at different temperatures. The spectral changes of the polymer and water with temperature were analyzed by N-way principal component analysis (NPCA). It was found that, at low concentration, the chains of the polymer tend to form a loose hydrophobic structure below 36 °C and then aggregate into a micelle at a lower critical solution temperature (LCST) of around 39 °C. In the process of the aggregation, the water species with two hydrogen bonds (S2) increases gradually before 36 °C and then a sudden decrease occurs after that temperature. The results clearly indicate that water species S2 plays an important role in the formation of the intermediate, i.e., the loose hydrophobic structure of the polymer chains linked by the two hydrogen bonds of S2 water. When the temperature increases, the dissociation of the hydrogen bonds enables the intermediate to be destroyed to form a micelle structure. For the high concentration solution, however, the spectral information of S2 was not found in the aggregation, suggesting direct formation of the micelle from the dehydrated chains.
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Affiliation(s)
- Li Wang
- Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, P. R. China.
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20
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Muralter F, Perrotta A, Coclite AM. Thickness-Dependent Swelling Behavior of Vapor-Deposited Smart Polymer Thin Films. Macromolecules 2018; 51:9692-9699. [PMID: 30591733 PMCID: PMC6300310 DOI: 10.1021/acs.macromol.8b02120] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 11/06/2018] [Indexed: 11/29/2022]
Abstract
In this contribution, the temperature-dependent swelling behavior of vapor-deposited smart polymer thin films is shown to depend on cross-linking and deposited film thickness. Smart polymers find application in sensor and actuator setups and are mostly fabricated on delicate substrates with complex nanostructures that need to be conformally coated. As initiated chemical vapor deposition (iCVD) meets these specific requirements, the present work concentrates on temperature-dependent swelling behavior of iCVD poly(N-isopropylacrylamide) thin films. The transition between swollen and shrunken state and the corresponding lower critical solution temperature (LCST) was investigated by spectroscopic ellipsometry in water. The films' density in the dry state evaluated from X-ray reflectivity could be successfully correlated to the position of the LCST in water and was found to vary between 1.1 and 1.3 g/cm3 in the thickness range 30-330 nm. This work emphasizes the importance of insights in both the deposition process and mechanisms during swelling of smart polymeric structures.
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Affiliation(s)
- Fabian Muralter
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
| | - Alberto Perrotta
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
| | - Anna Maria Coclite
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
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21
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Zardad A, Mabrouk M, Marimuthu T, du Toit L, Kumar P, Choonara Y, Kondiah P, Badhe R, Chejara D, Pillay V. Synthesis and biocompatibility of dual-responsive thermosonic injectable organogels based on crosslinked N-(isopropyl acrylamide) for tumour microenvironment targeting. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 90:148-158. [DOI: 10.1016/j.msec.2018.04.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 03/28/2018] [Accepted: 04/19/2018] [Indexed: 02/06/2023]
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22
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Zhang J, Peng CA. Poly(N-isopropylacrylamide) modified polydopamine as a temperature-responsive surface for cultivation and harvest of mesenchymal stem cells. Biomater Sci 2018; 5:2310-2318. [PMID: 29022603 DOI: 10.1039/c7bm00371d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A thermo-responsive surface was fabricated by depositing poly(N-isopropylacrylamide) (PNIPAAm) onto polydopamine coated cell culture substrata through free radical polymerization for the purpose of culturing and harvesting human mesenchymal stem cells (hMSCs). Human MSCs were cultured onto the PNIPAAm-g-polydopamine coated surface and harvested by changing from physiological to ambient temperature. The produced PNIPAAm-g-polydopamine surface was characterized by atomic force microscopy, Fourier transform infrared spectroscopy, nuclear magnetic resonance, water contact angle measurement, differential scanning calorimetry, and cell culture studies. Our results revealed that hMSCs could be detached from the PNIPAAm-g-polydopamine surface within 60 min after switching the temperature from 37 °C to room temperature. The detached hMSCs were able to proliferate on the PNIPAAm-g-polydopamine coated surface for further growth and harvest.
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Affiliation(s)
- Jun Zhang
- Department of Biological Engineering, University of Idaho, Moscow, ID 83844, USA.
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23
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Sun W, Wu P. A molecular level study of the phase transition process of hydrogen-bonding UCST polymers. Phys Chem Chem Phys 2018; 20:20849-20855. [DOI: 10.1039/c8cp04147d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A molecular level study of the UCST-type transition process of PNAGA-based polymers in water and a water/methanol mixture.
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Affiliation(s)
- Wenhui Sun
- The State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Laboratory for Advanced Materials
- Fudan University
- Shanghai 200433
| | - Peiyi Wu
- The State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Laboratory for Advanced Materials
- Fudan University
- Shanghai 200433
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24
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Futscher MH, Philipp M, Müller-Buschbaum P, Schulte A. The Role of Backbone Hydration of Poly(N-isopropyl acrylamide) Across the Volume Phase Transition Compared to its Monomer. Sci Rep 2017; 7:17012. [PMID: 29208941 PMCID: PMC5717149 DOI: 10.1038/s41598-017-17272-7] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 11/22/2017] [Indexed: 11/08/2022] Open
Abstract
Thermo-responsive polymers undergo a reversible coil-to-globule transition in water after which the chains collapse and aggregate into bigger globules when passing to above its lower critical solution temperature (LCST). The hydrogen bonding with the amide groups in the side chains has to be contrasted with the hydration interaction of the hydrophobic main-chain hydrocarbons. In the present investigation we study molecular changes in the polymer poly(N-isopropyl acrylamide) (PNIPAM) and in its monomer N-isopropyl acrylamide (NIPAM) in solution across the LCST transition. Employing Fourier-transform infrared spectroscopy we probe changes in conformation and hydrogen bonding. We observe a nearly discontinuous shift of the peak frequencies and areas of vibrational bands across the LCST transition for PNIPAM whereas NIPAM exhibits a continuous linear change with temperature. This supports the crucial role of the polymer backbone with respect to hydration changes in the amide group in combination with cooperative interactions of bound water along the backbone chain.
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Affiliation(s)
- Moritz H Futscher
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748, Garching, Germany
| | - Martine Philipp
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748, Garching, Germany
| | - Peter Müller-Buschbaum
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748, Garching, Germany
| | - Alfons Schulte
- University of Central Florida, Department of Physics and College of Optics and Photonics, 4111 Libra Drive, Orlando, FL, 32817-2385, United States.
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25
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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] [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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26
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Pandiyarajan CK, Genzer J. Effect of Network Density in Surface-Anchored Poly(N-isopropylacrylamide) Hydrogels on Adsorption of Fibrinogen. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1974-1983. [PMID: 28112519 DOI: 10.1021/acs.langmuir.6b04434] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
We describe a simple approach to generate surface-attached biocompatible hydrogels with tunable cross-link density and employ them to study the effect of gel structure on protein adsorption. Using free-radical polymerization, we synthesize a series of random copolymers comprising N-isopropylacrylamide (NIPAm) and the photoactive curing agent 4-methacryloyl-oxy-benzophenone (MABP) of mole fractions ranging from 2.5 to 10%. We deposit a thin film of the precursor copolymer (∼150 nm) on a silicon or glass substrate, which is precoated with monolayers of benzophenone-silane, then cross-link it through UV irradiation at 365 nm (dose ≈ 6-10 J/cm2) to generate surface-attached networks. A systematic investigation of the network properties such as gel fraction, cross-link density, and swelling ratio reveals that gels with higher MABP content (≥5%) produce densely cross-linked hydrophobic networks with low or no swelling in an aqueous medium. We study the adsorption of fibrinogen (Fg) on such hydrogel substrates and establish that the amount of adsorbed Fg depends on the degree of cross-linking and the swelling capacity of the networks. Specifically, although Fg adsorbs heavily on denser networks, loosely bound gels that swell in aqueous medium repel proteins. We attribute the latter behavior to entropic shielding and size-exclusion factors.
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Affiliation(s)
- C K Pandiyarajan
- Department of Chemical & Biomolecular Engineering, North Carolina State University , Raleigh, North Carolina 27695-7905, United States
| | - Jan Genzer
- Department of Chemical & Biomolecular Engineering, North Carolina State University , Raleigh, North Carolina 27695-7905, United States
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University , Sapporo 060-0817, Japan
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27
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Su G, Zhou T, Liu X, Zhang Y. Two-step volume phase transition mechanism of poly(N-vinylcaprolactam) hydrogel online-tracked by two-dimensional correlation spectroscopy. Phys Chem Chem Phys 2017; 19:27221-27232. [DOI: 10.1039/c7cp04571a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The volume phase transition of PVCL hydrogel was online-tracked by 2D correlation FTIR spectroscopy, and a two-step mechanism was proposed.
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Affiliation(s)
- Gehong Su
- State Key Laboratory of Polymer Materials Engineering of China
- Polymer Research Institute
- Sichuan University
- Chengdu 610065
- China
| | - Tao Zhou
- State Key Laboratory of Polymer Materials Engineering of China
- Polymer Research Institute
- Sichuan University
- Chengdu 610065
- China
| | - Xifei Liu
- State Key Laboratory of Polymer Materials Engineering of China
- Polymer Research Institute
- Sichuan University
- Chengdu 610065
- China
| | - Yulin Zhang
- State Key Laboratory of Polymer Materials Engineering of China
- Polymer Research Institute
- Sichuan University
- Chengdu 610065
- China
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28
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Wu L, Glebe U, Böker A. Synthesis of Hybrid Silica Nanoparticles Densely Grafted with Thermo and pH Dual-Responsive Brushes via Surface-Initiated ATRP. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01792] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Lei Wu
- Fraunhofer Institute
for Applied Polymer Research IAP, Geiselbergstr.
69, 14476 Potsdam-Golm, Germany
- Lehrstuhl
für Makromolekulare Materialien und Oberflächen, RWTH Aachen University, Forckenbeckstr. 50, 52056 Aachen, Germany
- DWI−Leibniz
Institut für Interaktive Materialien e.V., Forckenbeckstr. 50, 52056 Aachen, Germany
| | - Ulrich Glebe
- Fraunhofer Institute
for Applied Polymer Research IAP, Geiselbergstr.
69, 14476 Potsdam-Golm, Germany
| | - Alexander Böker
- Fraunhofer Institute
for Applied Polymer Research IAP, Geiselbergstr.
69, 14476 Potsdam-Golm, Germany
- Lehrstuhl
für Polymermaterialien und Polymertechnologie, Universität Potsdam, 14476 Potsdam-Golm, Germany
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29
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Park Y, Hashimoto C, Ozaki Y, Jung YM. Understanding the phase transition of linear poly(N-isopropylacrylamide) gel under the heating and cooling processes. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.02.067] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Seto H, Imai K, Hoshino Y, Miura Y. Polymer microgel particles as basic catalysts for Knoevenagel condensation in water. Polym J 2016. [DOI: 10.1038/pj.2016.44] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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31
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Wang J, Liu B, Ru G, Bai J, Feng J. Effect of Urea on Phase Transition of Poly(N-isopropylacrylamide) and Poly(N,N-diethylacrylamide) Hydrogels: A Clue for Urea-Induced Denaturation. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01949] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jian Wang
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
- University of
Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Biaolan Liu
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
- University of
Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Geying Ru
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
| | - Jia Bai
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
- University of
Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jiwen Feng
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
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32
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A Convoluted Polymeric Imidazole Palladium Catalyst: Structural Elucidation and Investigation of the Driving Force for the Efficient Mizoroki-Heck Reaction. ChemCatChem 2015. [DOI: 10.1002/cctc.201500249] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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33
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Lizundia E, Meaurio E, Laza J, Vilas J, León Isidro L. Study of the chain microstructure effects on the resulting thermal properties of poly(l-lactide)/poly(N-isopropylacrylamide) biomedical materials. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 50:97-106. [DOI: 10.1016/j.msec.2015.01.097] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Revised: 01/05/2015] [Accepted: 01/30/2015] [Indexed: 02/02/2023]
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34
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Stanton MM, Lambert CR. A thermoresponsive, micro-roughened cell culture surface. Acta Biomater 2015; 15:11-9. [PMID: 25523874 DOI: 10.1016/j.actbio.2014.12.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 11/18/2014] [Accepted: 12/08/2014] [Indexed: 12/11/2022]
Abstract
Surface topography has been shown to play a major role in cell behavior, but has yet to be seriously exploited in the field of cell surface engineering. In the present work, surface roughness has been used in combination with the thermoresponsive polymer polyisopropylacrylamide (PIPAAm) to generate cell sheets with tailored biochemical properties. Micro-roughened polystyrene (PS) with 1.5-5.5 μm features was derivatized with PIPAAm to form a cell culture surface for the growth of human fibroblast cell sheets that exhibit a modified cytoskeleton and extracellular matrix. Fibroblasts cell sheets cultured on the rough surfaces had fewer actin stress fibers and twice the average fibronectin (FN) fibril formation when compared to cell sheets on flat substrates. The cell sheets harvested from the roughened PS were collected after only 2 days of culture and detached from the PIPAAm grafted surface in <1h after cooling the culture system. The simple and rapid method for generating cell sheets with increased FN fibril formation has applications in tissue grafts or wound repair and has demonstrated that the thermoresponsive surface can be used for reliable cell sheet formation.
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35
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Abdali Z, Yeganeh H, Solouk A, Gharibi R, Sorayya M. Thermoresponsive antimicrobial wound dressings via simultaneous thiol-ene polymerization and in situ generation of silver nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra11618j] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Thermoresponsive and antimicrobial wound dressing via thiol-ene polymerization reaction.
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Affiliation(s)
- Zahra Abdali
- Biomedical Engineering Faculty
- Amirkabir University of Technology
- Tehran
- Iran
| | | | - Atefeh Solouk
- Biomedical Engineering Faculty
- Amirkabir University of Technology
- Tehran
- Iran
| | - Reza Gharibi
- Iran Polymer and Petrochemical Institute
- Tehran
- Iran
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36
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Li L, Jiang G, Du X, Chen H, Liu Y, Huang Q, Kong X, Yao J. Preparation of glucose-responsive and fluorescent micelles via a combination of RAFT polymerization and chemoenzymatic transesterification for controlled release of insulin. RSC Adv 2015. [DOI: 10.1039/c5ra15281j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Polymeric micelles with glucose-responsive and fluorescent features have been synthesized using a one-pot method via a combination of RAFT polymerization and chemoenzymatic tranesterification for controlled release of insulin in vitro.
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Affiliation(s)
- Lei Li
- Department of Materials Engineering
- Zhejiang Sci Tech University
- Hangzhou 310018
- China
| | - Guohua Jiang
- Department of Materials Engineering
- Zhejiang Sci Tech University
- Hangzhou 310018
- China
- National Engineering Laboratory for Textile Fiber Materials and Processing Technology (Zhejiang)
| | - Xiangxiang Du
- Department of Materials Engineering
- Zhejiang Sci Tech University
- Hangzhou 310018
- China
| | - Hua Chen
- Department of Materials Engineering
- Zhejiang Sci Tech University
- Hangzhou 310018
- China
| | - Yongkun Liu
- Department of Materials Engineering
- Zhejiang Sci Tech University
- Hangzhou 310018
- China
| | - Qin Huang
- Department of Materials Engineering
- Zhejiang Sci Tech University
- Hangzhou 310018
- China
| | - Xiangdong Kong
- College of Life Science
- Zhejiang Sci Tech University
- Hangzhou 310018
- China
| | - Juming Yao
- Department of Materials Engineering
- Zhejiang Sci Tech University
- Hangzhou 310018
- China
- National Engineering Laboratory for Textile Fiber Materials and Processing Technology (Zhejiang)
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37
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Chen X, He Y, Shi C, Fu W, Bi S, Wang Z, Chen L. Temperature- and pH-responsive membranes based on poly (vinylidene fluoride) functionalized with microgels. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.07.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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38
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Yang J, van Lith R, Baler K, Hoshi RA, Ameer GA. A thermoresponsive biodegradable polymer with intrinsic antioxidant properties. Biomacromolecules 2014; 15:3942-52. [PMID: 25295411 DOI: 10.1021/bm5010004] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Oxidative stress in tissue can contribute to chronic inflammation that impairs wound healing and the efficacy of cell-based therapies and medical devices. We describe the synthesis and characterization of a biodegradable, thermoresponsive gel with intrinsic antioxidant properties suitable for the delivery of therapeutics. Citric acid, poly(ethylene glycol) (PEG), and poly-N-isopropylacrylamide (PNIPAAm) were copolymerized by sequential polycondensation and radical polymerization to produce poly(polyethylene glycol citrate-co-N-isopropylacrylamide) (PPCN). PPCN was chemically characterized, and the thermoresponsive behavior, antioxidant properties, morphology, potential for protein and cell delivery, and tissue compatibility in vivo were evaluated. The PPCN gel has a lower critical solution temperature (LCST) of 26 °C and exhibits intrinsic antioxidant properties based on its ability to scavenge free radicals, chelate metal ions, and inhibit lipid peroxidation. PPCN displays a hierarchical architecture of micropores and nanofibers, and contrary to typical thermoresponsive polymers, such as PNIPAAm, PPCN gel maintains its volume upon formation. PPCN efficiently entrapped and slowly released the chemokine SDF-1α and supported the viability and proliferation of vascular cells. Subcutaneous injections in rats showed that PPCN gels are resorbed over time and new connective tissue formation takes place without signs of significant inflammation. Ultimately, this intrinsically antioxidant, biodegradable, thermoresponsive gel could potentially be used as an injectable biomaterial for applications where oxidative stress in tissue is a concern.
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Affiliation(s)
- Jian Yang
- Biomedical Engineering Department, Northwestern University , Evanston, Illinois 60208, United States
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39
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Chen X, Zhao B, Zhao L, Bi S, Han P, Feng X, Chen L. Temperature- and pH-responsive properties of poly(vinylidene fluoride) membranes functionalized by blending microgels. RSC Adv 2014. [DOI: 10.1039/c4ra02724h] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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40
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Tang Z, Guan Y, Zhang Y. Contraction-type glucose-sensitive microgel functionalized with a 2-substituted phenylboronic acid ligand. Polym Chem 2014. [DOI: 10.1039/c3py01190a] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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41
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Han X, Xiao P, Zhao H, Zeng C, Zhou J. Response mechanism of the phase transitions of poly(n-isopropylacrylamide-co-benzo-18-crown-6-acrylamide) using infrared spectroscopy. APPLIED SPECTROSCOPY 2014; 68:879-889. [PMID: 25061789 DOI: 10.1366/13-07437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The thermal and ionic effects on the phase transitions of poly(N-isopropylacrylamide) (PNIPAAm) and its copolymer with benzo-18-crown-6-acrylamide, poly(N-isopropylacrylamide-co-benzo-18-crown-6-acrylamide) (PNIPAAm-co-BCAm), were investigated using infrared (IR) spectral variations of methyl (CH3), C=O, and amine (NH) groups. Subsequently, perturbation correlation moving-window two-dimensional correlation infrared spectroscopy (PCMW 2D-IR) was applied to clarify the differences in the phase-transition mechanisms of the polymers. The dominant influence on the phase-transition mechanism of PNIPAAm is whether the anion is evenly distributed in the bulk solution. The results show that the phase transition shifts to a lower temperature with increasing barium chloride (BaCl2) concentrations. In addition, the effect of the anion on the chemical group is homogeneous upon heating. As a result, the relevant transition temperature ranges have remain approximately constant. In contrast, the dominant influence on the phase-transition mechanism of PNIPAAm-co-BCAm is the interactions of the polymer chains with barium ions (Ba(2+)). The hydrophilic BCAm-Ba(2+) complexes distributed in the PNIPAAm-co-BCAm chain prevent the water molecules from leaving the polymer chains, which leads to an increase in the transition temperature and the complicated variation of the transition temperature range, as environmental stimuli-response behavior, with increasing BaCl2 concentrations.
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Affiliation(s)
- Xiaoyan Han
- Xiangtan University, School of Chemical Engineering, Xiangtan 411105, China
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42
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Investigation of the phase separation of PNIPAM using infrared spectroscopy together with multivariate data analysis. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.10.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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43
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Katiyar R, Bag DS, Nigam I. Radical polymerization of ethyl methacrylate (EMA) in the presence of fullerene (C60) using triphenylbismuthonium ylide as an initiator and characterization of the synthesized polymers (C60-EMA). JOURNAL OF POLYMER RESEARCH 2013. [DOI: 10.1007/s10965-013-0243-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Jalili K, Abbasi F, Milchev A. Surface Microdynamics Phase Transition and Internal Structure of High-Density, Ultrathin PHEMA-b-PNIPAM Diblock Copolymer Brushes on Silicone Rubber. Macromolecules 2013. [DOI: 10.1021/ma4003962] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Jalili
- Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - F. Abbasi
- Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran
| | - A. Milchev
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Institute for Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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45
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Mitrovic B, Eastwood S, Wong V, Dyer D, Kinsel G, Scott C. Peptide/protein separation with cationic polymer brush nanosponges for MALDI-MS analysis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:696-700. [PMID: 23244629 PMCID: PMC3632665 DOI: 10.1021/la3033995] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
A cationic polymer nanobrush was synthesized, attached to a MALDI target, and used for the fractionation of peptides and proteins based on their pI, prior to analysis by MALDI-MS. The cationic polymer nanobrush was synthesized on a gold substrate by AIBN photoinitiated polymerization, using a 70:30 ratio of 2-aminoethyl methacrylate hydrochloride (AEMA):N-isopropylacrylamide (NIPAAM). This brush showed selectivity for adsorption of acidic peptides and proteins and allowed fractionation of simple two-component mixtures to be completed in less than 10 min. The brush-adsorbed biomolecules were recovered by treating the nanobrush with ammonium hydroxide, which effectively collapsed the brush, thereby releasing the trapped compounds for MALDI MS analysis. These results demonstrate that nanobrush can serve as a convenient platform for rapid fractionation of biomolecules prior to analysis by MALDI-MS.
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46
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Rotzetter ACC, Schumacher CM, Bubenhofer SB, Grass RN, Gerber LC, Zeltner M, Stark WJ. Thermoresponsive polymer induced sweating surfaces as an efficient way to passively cool buildings. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:5352-5356. [PMID: 22933383 DOI: 10.1002/adma.201202574] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Indexed: 06/01/2023]
Abstract
Buildings can be effectively cooled by a bioinspired sweating-like action based on thermoresponsive hydrogels (PNIPAM), which press out their stored water when exceeding the lower critical solution temperature. The surface temperature is reduced by 15 °C compared to that of a conventional hydrogel (pHEMA) and by 25 °C compared to the bare ground.
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Affiliation(s)
- A C C Rotzetter
- Institute for Chemical and Bioengineering, ETH Zurich, 8093 Zurich, Switzerland
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47
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Musial W, Voncina B, Pluta J, Kokol V. The study of release of chlorhexidine from preparations with modified thermosensitive poly-N-isopropylacrylamide microspheres. ScientificWorldJournal 2012; 2012:243707. [PMID: 22629123 PMCID: PMC3353284 DOI: 10.1100/2012/243707] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Accepted: 11/20/2011] [Indexed: 11/17/2022] Open
Abstract
The aim of this study was to investigate and compare the release rates of chlorhexidine (CX) base entrapped in the polymeric beads of modified poly-N-isopropylacrylamides (pNIPAMs) at temperatures below and over the volume phase transition temperature (VPTT) of synthesized polymers: pNIPAM-A with terminal anionic groups resulting from potassium persulfate initiator, pNIPAM-B with cationic amidine terminal groups, and pNIPAM-C comprising anionic terminals, but with increased hydrophobicity maintained by the N-tert-butyl functional groups. The preparations, assessed in vitro below the VPTT, release an initial burst of CX at different time periods between 120 and 240 min, followed by a period of 24 h, when the rate of release remains approximately constant, approaching the zero-order kinetics; the release rates for the polymers beads are as follows: pNIPAM-C>pNIPAM-B>pNIPAM-A. The pattern of release rates at temperature over the VPTT is as follows: pNIPAM-C>pNIPAM-A>pNIPAM-B. In the presence of pNIPAM-C, the duration between the start of the release and the attained minimal inhibitory concentration (MIC) for most of the microbes, in conditions over the VPTT, increased from 60 to 90 min. The release prolongation could be ascribed to some interactions between the practically insoluble CX particle and the hydrophobic functional groups of the polymer.
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Affiliation(s)
- Witold Musial
- Department of Pharmaceutical Technology, Wroclaw Medical University, ul Szewska 38, 50-139 Wrocław, Poland.
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48
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Wang Z, Wu P. The influence of ionic liquid on phase separation of poly(N-isopropylacrylamide) aqueous solution. RSC Adv 2012. [DOI: 10.1039/c2ra01349e] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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49
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Thermo-responsive poly(N-isopropylacrylamide) grafted onto microtextured poly(dimethylsiloxane) for aligned cell sheet engineering. Colloids Surf B Biointerfaces 2011; 99:108-15. [PMID: 22088757 DOI: 10.1016/j.colsurfb.2011.10.040] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 10/19/2011] [Accepted: 10/20/2011] [Indexed: 11/22/2022]
Abstract
Poly(N-isopropylacrylamide) (PNIPAAm)-grafted poly(dimethylsiloxane) (PDMS) offers an inexpensive, biocompatible, oxygen permeable, and easily microtextured thermo-responsive substrate for producing cell sheets. This study introduces a method of grafting PNIPAAm onto microtextured PDMS that is suitable for generating aligned vascular smooth muscle cell (VSMC) sheets. We examined a wide range of processing parameters in order to identify the conditions that led to acceptable sheet growth and detachment behavior. Substrates grafted under these conditions produced confluent cell sheets that fully detached in less than 10 min after lowering the culture temperature from 37 °C to 20 °C. The grafted layer thickness was determined to be 496±8 nm by atomic force microscopy. Surface characterization by Fourier transform infrared spectroscopy showed a relative grafting yield of 0.488±0.10, defined as the ratio of the PNIPAAm 1647 cm(-1) to the PDMS 2962 cm(-1) absorbance peaks. The water contact angle of the substrates was shown to change from 89.6° to 101.0° at 20 °C and 37 °C, respectively. We also found that cell behavior on PNIPAAm-grafted PDMS was not directly related to surface wettability or relative grafting densities.
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50
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Wang Z, Wu P. Spectral Insights into Gelation Microdynamics of PNIPAM in an Ionic Liquid. J Phys Chem B 2011; 115:10604-14. [DOI: 10.1021/jp205650h] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Zhangwei Wang
- The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People’s Republic of China
| | - Peiyi Wu
- The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People’s Republic of China
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