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Farias-Mancilla B, Balestri A, Zhang J, Frielinghaus H, Berti D, Montis C, Destarac M, Schubert US, Guerrero-Sanchez C, Harrisson S, Lonetti B. Morphology and thermal transitions of self-assembled NIPAM-DMA copolymers in aqueous media depend on copolymer composition profile. J Colloid Interface Sci 2024; 662:99-108. [PMID: 38340518 DOI: 10.1016/j.jcis.2024.02.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 01/18/2024] [Accepted: 02/04/2024] [Indexed: 02/12/2024]
Abstract
HYPOTHESIS There is a lack of understanding of the interplay between the copolymer composition profile and thermal transition observed in aqueous solutions of N-isopropyl acrylamide (NIPAM) copolymers, as well as the correlation between this transition and the formation and structure of copolymer self-assemblies. EXPERIMENTS For this purpose, we investigated the response of five copolymers with the same molar mass and chemical composition, but with different composition profile in aqueous solution against temperature. Using complementary analytical techniques, we probed structural properties at different length scales, from the molecular scale with Nuclear Magnetic Resonance (NMR) to the colloidal scale with Dynamic Light Scattering (DLS) and Small Angle Neutron Scattering (SANS). FINDINGS NMR and SANS investigations strengthen each other and allow a clear picture of the change of copolymer solubility and related copolymer self-assembly as a function of temperature. At the molecular scale, dehydrating NIPAM units drag N,N-dimethyl acrylamide (DMA) moieties with them in a gradual collapse of the copolymer chain; this induces a morphological transition of the self-assemblies from star-like nanostructures to crew-cut micelles. Interestingly, the transition spans a temperature range which depends on the monomer distribution profile in the copolymer chain, with the asymmetric triblock copolymer specimen revealing the broadest one. We show that the broad morphological transitions associated with gradient copolymers can be mimicked and even surpassed by the use of stepwise gradient (asymmetric) copolymers, which can be more easily and reproducibly synthesized than linear gradient copolymers.
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Affiliation(s)
- Barbara Farias-Mancilla
- Laboratoire Softmat, Université de Toulouse, CNRS UMR 5623, Université Toulouse III - Paul Sabatier, France
| | - Arianna Balestri
- Department of Chemistry "Ugo Schiff", University of Florence and CSGI, Florence, Italy
| | - Junliang Zhang
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Jena, Germany; Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Jena, Germany
| | - Henrich Frielinghaus
- Forschungszentrum Jülich GmbH, Jülich Center for Neutron Science at Heinz Maier-Leibnitz Zentrum, Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Debora Berti
- Department of Chemistry "Ugo Schiff", University of Florence and CSGI, Florence, Italy
| | - Costanza Montis
- Department of Chemistry "Ugo Schiff", University of Florence and CSGI, Florence, Italy
| | - Mathias Destarac
- Laboratoire Softmat, Université de Toulouse, CNRS UMR 5623, Université Toulouse III - Paul Sabatier, France
| | - Ulrich S Schubert
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Jena, Germany; Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Jena, Germany
| | - Carlos Guerrero-Sanchez
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Jena, Germany; Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Jena, Germany.
| | - Simon Harrisson
- LCPO, CNRS/Bordeaux-INP/Université de Bordeaux, Pessac, France.
| | - Barbara Lonetti
- Laboratoire Softmat, Université de Toulouse, CNRS UMR 5623, Université Toulouse III - Paul Sabatier, France.
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Khorsandi H, Karimi AR, Azadikhah F. Preparation and Evaluation of a Sulfadimethoxine‐Conjugated Hydrogel Based on
N
‐isopropylacrylamide as a Sustained Release Drug Delivery System. ChemistrySelect 2022. [DOI: 10.1002/slct.202202428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hesam Khorsandi
- Department of Chemistry Faculty of Science Arak University Arak 38156-8-8349 Iran
| | - Ali Reza Karimi
- Department of Chemistry Faculty of Science Arak University Arak 38156-8-8349 Iran
| | - Farnaz Azadikhah
- Department of Chemistry Faculty of Science Arak University Arak 38156-8-8349 Iran
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3
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Zhao D, Zhao Q, Xu Z, Shi X. Preparation of temperature‐sensitive fragrance nanocapsules and its controllable release property. FLAVOUR FRAG J 2022. [DOI: 10.1002/ffj.3711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Di Zhao
- School of Perfume and Aroma Technology Shanghai Institute of Technology No. 100 Haiquan Road, Shanghai China
| | - Qixuan Zhao
- School of Perfume and Aroma Technology Shanghai Institute of Technology No. 100 Haiquan Road, Shanghai China
| | - Zhifei Xu
- Shanghai Zhishengyuan Testing Technology Co., Ltd Shanghai China
| | - Xiaodi Shi
- College of Chemistry, Chemical Engineering and Biotechnology Donghua University Shanghai China
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4
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RAFT Emulsion Polymerization of Styrene Using a Poly(( N,N-dimethyl acrylamide)- co-( N-isopropyl acrylamide)) mCTA: Synthesis and Thermosensitivity. Polymers (Basel) 2021; 14:polym14010062. [PMID: 35012086 PMCID: PMC8747436 DOI: 10.3390/polym14010062] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 12/21/2021] [Accepted: 12/21/2021] [Indexed: 01/13/2023] Open
Abstract
Thermoresponsive poly((N,N-dimethyl acrylamide)-co-(N-isopropyl acrylamide)) (P(DMA-co-NIPAM)) copolymers were synthesized via reversible addition−fragmentation chain transfer (RAFT) polymerization. The monomer reactivity ratios were determined by the Kelen–Tüdős method to be rNIPAM = 0.83 and rDMA = 1.10. The thermoresponsive properties of these copo-lymers with varying molecular weights were characterized by visual turbidimetry and dynamic light scattering (DLS). The copolymers showed a lower critical solution temperature (LCST) in water with a dependence on the molar fraction of DMA in the copolymer. Chaotropic and kosmotropic salt anions of the Hofmeister series, known to affect the LCST of thermoresponsive polymers, were used as additives in the aqueous copolymer solutions and their influence on the LCST was demonstrated. Further on, in order to investigate the thermoresponsive behavior of P(DMA-co-NIPAM) in a confined state, P(DMA-co-NIPAM)-b-PS diblock copolymers were prepared via polymerization induced self-assembly (PISA) through surfactant-free RAFT mediated emulsion polymerization of styrene using P(DMA-co-NIPAM) as the macromolecular chain transfer agent (mCTA) of the polymerization. As confirmed by cryogenic transmission electron microscopy (cryoTEM), this approach yielded stabilized spherical micelles in aqueous dispersions where the PS block formed the hydrophobic core and the P(DMA-co-NIPAM) block formed the hydrophilic corona of the spherical micelle. The temperature-dependent behavior of the LCST-type diblock copolymers was further studied by examining the collapse of the P(DMA-co-NIPAM) minor block of the P(DMA-co-NIPAM)-b-PS diblock copolymers as a function of temperature in aqueous solution. The nanospheres were found to be thermosensitive by changing their hydrodynamic radii almost linearly as a function of temperature between 25 °C and 45 °C. The addition of kosmotropic salt anions, as a potentially useful tuning feature of micellar assemblies, was found to increase the hydrodynamic radius of the micelles and resulted in a faster collapse of the micelle corona upon heating.
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5
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Boyes VL, Janani R, Partridge S, Fielding LA, Breen C, Foulkes J, Le Maitre CL, Sammon C. One-pot precipitation polymerisation strategy for tuneable injectable Laponite®-pNIPAM hydrogels: Polymerisation, processability and beyond. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.124201] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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6
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Equilibrium swelling of multi-stimuli-responsive copolymer gels. J Mech Behav Biomed Mater 2021; 121:104623. [PMID: 34098283 DOI: 10.1016/j.jmbbm.2021.104623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 05/24/2021] [Accepted: 05/27/2021] [Indexed: 11/20/2022]
Abstract
Copolymer gels prepared by polymerization of thermo-responsive and anionic monomers demonstrate strong sensitivity to several triggers such as temperature, pH and ionic strength of aqueous solutions. For biomedical applications of these materials (as on-off switches in controlled drug delivery and release), fine tuning of their volume phase transition temperature (VPTT) and a sharp decay in degree of swelling upon transition from the swollen to the collapsed state are needed. These requirements are fulfilled under swelling of copolymer gels and microgels in water under acidic conditions, but are violated when tests are conducted under alkaline conditions or in aqueous solutions of salts with physiological salinity. A model is developed for equilibrium swelling of multi-stimuli-responsive copolymer gels in aqueous solutions with arbitrary pH and molar fractions of a monovalent salt. Unlike conventional approaches, the model accounts for secondary interactions between chains (hydrogen bonding) to describe the kinetics of aggregation of hydrophobic segments above VPTT. Material constants are determined by fitting experimental swelling diagrams on poly(N-isopropylacrylamide-co-sodium acrylate) gels with various molar fractions of ionic monomers. The effects of temperature, pH and molar fraction of salt on the equilibrium degree of swelling below and above VPTT are studied numerically.
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7
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Thermoresponsive Nanogels of Modified Poly((di(ethylene glycol) methyl ether methacrylate)- co-(2-aminoethyl methacrylate))s. Polymers (Basel) 2020; 12:polym12081645. [PMID: 32722035 PMCID: PMC7463910 DOI: 10.3390/polym12081645] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/21/2020] [Accepted: 07/21/2020] [Indexed: 12/21/2022] Open
Abstract
A series of copolymers of di(ethylene glycol) methyl ether methacrylate (D) and 2-aminoethyl methacrylate (A) (P(D-co-A)) with variable ratios of comonomers were synthesized using atom transfer radical polymerization. Then, the amino groups of obtained copolymers were modified to clickable azide or prop-2-yn-1-yl carbamate groups. A thermoresponsive copolymers were obtained with the value of cloud point temperature (TCP) dependent on the type and number of functional groups in the copolymer and on the concentration of solutions. For P(D-co-A) copolymers, the TCP increased with increasing content of 2-aminoethyl methacrylate comonomer. The presence of azide and prop-2-yn-1-yl carbamate groups caused the changes of TCP of modified copolymers. All studied copolymers in dilute aqueous solutions aggregated above TCP to nanoparticles with sizes dependent on the solution concentration, heating procedures, and types and numbers of functional groups present in a copolymer chain. The presence of hydrophilic elements in the chain and the increase in the copolymer concentration led to the enlargement of the particle sizes. Aggregates were crosslinked using click reaction between an azide and prop-2-yn-1-yl carbamate groups that led to stable thermoresponsive nanogels. A systematic study of the behavior of copolymers allowed the determination of the chains useful for possible application in drug delivery.
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8
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Zehm D, Lieske A, Stoll A. On the Thermoresponsivity and Scalability of
N
,
N
‐Dimethylacrylamide Modified NIPAM Microgels. MACROMOL CHEM PHYS 2020. [DOI: 10.1002/macp.202000018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Daniel Zehm
- Fraunhofer Institute for Applied Polymer Research IAP Geiselbergstr. 69 Potsdam‐Golm 14476 Germany
| | - Antje Lieske
- Fraunhofer Institute for Applied Polymer Research IAP Geiselbergstr. 69 Potsdam‐Golm 14476 Germany
| | - Andrea Stoll
- Research Institute of Leather and Plastic Sheeting – FILK Meißner Ring 1–5 Freiberg 09599 Germany
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9
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Pérez-Ramírez HA, Odriozola G. A coil-to-globule transition capable coarse-grained model for poly(N-isopropylacrylamide). Phys Chem Chem Phys 2020; 22:17913-17921. [PMID: 32744283 DOI: 10.1039/d0cp03101a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We present a model for mesoscopic molecular dynamics simulations of poly(N-isopropyl-acrylamide) (pNIPAM).
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Affiliation(s)
- H. A. Pérez-Ramírez
- Área de Física de Procesos Irreversibles
- División de Ciencias Básicas e Ingeniería
- Universidad Autónoma Metropolitana-Azcapotzalco
- 02200 Ciudad de México
- Mexico
| | - G. Odriozola
- Área de Física de Procesos Irreversibles
- División de Ciencias Básicas e Ingeniería
- Universidad Autónoma Metropolitana-Azcapotzalco
- 02200 Ciudad de México
- Mexico
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10
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Audureau N, Coumes F, Guigner JM, Nguyen TPT, Ménager C, Stoffelbach F, Rieger J. Thermoresponsive properties of poly(acrylamide- co-acrylonitrile)-based diblock copolymers synthesized (by PISA) in water. Polym Chem 2020. [DOI: 10.1039/d0py00895h] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
UCST-type poly(acrylamide-co-acrylonitrile) diblock copolymers synthesized in water (by PISA) can not only undergo reversible temperature-induced chain dissociation, but also temperature-induced morphological transition.
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Affiliation(s)
- Nicolas Audureau
- Sorbonne Université
- CNRS
- UMR 8232
- Institut Parisien de Chimie Moléculaire (IPCM)
- Polymer Chemistry Team
| | - Fanny Coumes
- Sorbonne Université
- CNRS
- UMR 8232
- Institut Parisien de Chimie Moléculaire (IPCM)
- Polymer Chemistry Team
| | - Jean-Michel Guigner
- Sorbonne Université
- CNRS
- UMR 7590 Institut de Minéralogie
- de Physique des Matériaux et de Cosmochimie (IMPMC)-IRD-MNHN
- F-75005 Paris
| | - Thi Phuong Thu Nguyen
- Sorbonne Université
- CNRS
- UMR 8232
- Institut Parisien de Chimie Moléculaire (IPCM)
- Polymer Chemistry Team
| | - Christine Ménager
- Sorbonne Université
- CNRS
- UMR 8234
- PHENIX Laboratory
- 75252 Paris cedex 05
| | - François Stoffelbach
- Sorbonne Université
- CNRS
- UMR 8232
- Institut Parisien de Chimie Moléculaire (IPCM)
- Polymer Chemistry Team
| | - Jutta Rieger
- Sorbonne Université
- CNRS
- UMR 8232
- Institut Parisien de Chimie Moléculaire (IPCM)
- Polymer Chemistry Team
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11
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Kumbhakar K, Saha B, De P, Biswas R. Cloud Point Driven Dynamics in Aqueous Solutions of Thermoresponsive Copolymers: Are They Akin to Criticality Driven Solution Dynamics? J Phys Chem B 2019; 123:11042-11054. [PMID: 31794221 DOI: 10.1021/acs.jpcb.9b07840] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Cloud point driven interaction and relaxation dynamics of aqueous solutions of amphiphilic thermoresponsive copolymers were explored through picosecond resolved and steady state fluorescence measurements employing hydrophilic (coumarin 343, C343) and hydrophobic (coumarin 153, C153) solute probes of comparable sizes. These thermoresponsive random copolymers, with tunable cloud point temperatures (Tcp's) between 298 and 323 K, were rationally designed first and then synthesized via reversible addition-fragmentation chain transfer (RAFT) copolymerization of methyl methacrylate (MMA) and poly(ethylene glycol) monomethyl ether methacrylate (PEGMA). Subsequently, copolymers were characterized by NMR spectroscopy and size exclusion chromatography (SEC). A balance between the hydrophilic (PEGMA) and the hydrophobic (MMA) content dictates the critical aggregation concentration (CAC), with CAC ∼ 2-14 mg/L for these copolymers in aqueous media. No abrupt changes in the steady state spectral features of both C153 and C343 in the aqueous solutions of these polymers near but below the cloud point temperatures were observed. Interestingly, spectral properties of C153 in these solutions show the impact of hydrophobic/hydrophilic interaction balance but not by those of C343. More specifically, C153 reported a blue shift (relative to that in neat water) and heterogeneity in its local environment. This suggested different locations for the hydrophilic (C343) and the hydrophobic (C153) probes. In addition, the excited state fluorescence lifetime (⟨τlife⟩) of C153 increased with the increase of hydrophobic (MMA) content in these copolymers. However, C343 reported no such variations, although fluorescence anisotropy decays for both solutes were significantly slowed down in these aqueous solutions compared to neat water. Anisotropy decays indicated bimodal time-dependent friction for these solutes in aqueous solutions of these copolymers but monomodal in neat water. A linear dependence of the average rotational relaxation rates (⟨krot⟩ = ⟨τrot⟩-1) of the type ⟨krot⟩ ∝ (|T - Tcp|/Tcp)γ with negative values for the exponent γ was observed for both solutes. No slowing down of the solute rotation with temperature approaching the Tcp was detected; rather, rotation became faster upon increasing the solution temperature, suggesting domination of the local friction.
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Affiliation(s)
- Kajal Kumbhakar
- Chemical, Biological and Macromolecular Sciences (CBMS) , S. N. Bose National Centre for Basic Sciences , JD Block, Sector III, Salt Lake, Kolkata 700106 , India
| | - Biswajit Saha
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , Nadia, West Bengal , India
| | - Priyadarsi De
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , Nadia, West Bengal , India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences (CBMS) , S. N. Bose National Centre for Basic Sciences , JD Block, Sector III, Salt Lake, Kolkata 700106 , India
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12
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Podewitz M, Wang Y, Quoika PK, Loeffler JR, Schauperl M, Liedl KR. Coil-Globule Transition Thermodynamics of Poly( N-isopropylacrylamide). J Phys Chem B 2019; 123:8838-8847. [PMID: 31545046 DOI: 10.1021/acs.jpcb.9b06125] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Thermosensitive polymers such as poly(N-isopropylacrylamide) (PNIPAM) undergo a phase transition in aqueous solution from a random-coil structural ensemble to a globule structural ensemble at the lower critical solution temperature (LCST). Above this temperature, PNIPAM agglomerates and becomes insoluble, whereas it is soluble below the temperature. Thus, thermosensitive polymers represent essential targets for several applications, e.g., in drug delivery. Although their ability to change structure in response to a temperature alteration is highly relevant for industrial processes, their thermodynamic properties are mostly qualitatively understood, and the quantitative thermodynamic picture is still elusive. In this study, we used a combined atomistic molecular dynamics and well-tempered metadynamics simulation approach to estimate coil-globule transition thermodynamics. An isotactic 30-mer of PNIPAM was investigated over a broad temperature range between 200 and 360 K. The transition from the globule to the random-coil structure was observed with well-tempered metadynamics. For the first time, the free energy surface of PNIPAM was estimated and it is shown that the simulation results are in line with the experimentally observed thermosensitive behavior. Below the LCST, the random-coil ensemble represents the global energy minimum and is thermodynamically favored by 21 ± 9 kJ/mol compared to the globule ensemble; both are separated by a barrier of 49 ± 14 kJ/mol. In contrast, above the LCST, the globule ensemble is thermodynamically favored by 21 ± 8 kJ/mol over the random-coil ensemble. The barrier from random-coil to globule is 17 ± 10 kJ/mol.
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Affiliation(s)
- Maren Podewitz
- Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI) , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
| | - Yin Wang
- Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI) , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
| | - Patrick K Quoika
- Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI) , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
| | - Johannes R Loeffler
- Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI) , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
| | - Michael Schauperl
- Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI) , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
| | - Klaus R Liedl
- Institute of General, Inorganic and Theoretical Chemistry, and Center for Molecular Biosciences Innsbruck (CMBI) , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Austria
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13
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Consiglio G, Forte G. Molecular dynamics study of coil-to-globule transition in a thermo-responsive oligomer bound to various surfaces: hydrophilic surfaces stabilize the coil form. Phys Chem Chem Phys 2018; 20:29754-29763. [PMID: 30462107 DOI: 10.1039/c8cp05396k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structural and dynamical properties of 40-mer of thermo-responsive polymer PNIPAM covalently bound to different surfaces have been studied, at different temperatures, by means of molecular dynamics simulations. Evolution of the radius of gyration, Rg, of the polymer chain and radial distribution functions (RDFs) calculated for the carbon atoms of the PNIPAM backbone with water oxygens and for the hydrogen atom of the amide groups with water oxygens indicate that functionalized surfaces affect the coil-to-globule transition of PNIPAM, by means of electrostatic interactions, increasing the lower critical solution temperature (LCST) of the polymer. Such interactions, mainly represented by a H-bond, hinder the transition in the globular form while hydrophobic groups on the surface, such as -OCH3, contribute to the globular collapse. A significant alteration in the arrangement of water molecules around the polymer is testified by: (i) the absence of the second peak in the RDF between the C atoms of the PNIPAM backbone and the O atoms of water at the same temperature at which the radius of gyration decreases; (ii) the height of both the first and the second peak of the RDF between the H atom of the amide groups and water O atoms decreases when the temperature increases above the LCST. Finally, the H-bond autocorrelation function indicates that: (i) hydrogen bonds between the bound-to-surface PNIPAM acceptor groups (O[double bond, length as m-dash]C[double bond splayed right]) and the H atoms of water molecules are less persistent than H-bonds formed between the free PNIPAM acceptor groups and water; (ii) H-bonds between the PNIPAM acceptor groups and hydroxyl groups on the quartz surface are longer lived than those formed on graphene oxide.
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Affiliation(s)
- Giuseppe Consiglio
- Dipartimento di Scienze Chimiche, Università di Catania, I-95125 Catania, Italy.
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14
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Lipowska-Kur D, Szweda R, Trzebicka B, Dworak A. Preparation and characterization of doxorubicin nanocarriers based on thermoresponsive oligo(ethylene glycol) methyl ether methacrylate polymer-drug conjugates. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.10.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Guo Y, Song R, Feng R, Dai G, Liang Y, Pu D, Zhang X, Ye Z. Thermoresponsive behavior of graft copolymers based on poly(N,N-dimethylacrylamide-co-diacetoneacrylamide) side chains. J Appl Polym Sci 2018. [DOI: 10.1002/app.47051] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yongjun Guo
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Chengdu People's Republic of China
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
- Sichuan Guangya Polymer Chemical Co.; Chengdu People's Republic of China
| | - Rutong Song
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
| | - Rusen Feng
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Chengdu People's Republic of China
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
| | - Gang Dai
- China Resources Xinglu Gas Co.; Luzhou People's Republic of China
| | - Yan Liang
- Sichuan Guangya Polymer Chemical Co.; Chengdu People's Republic of China
| | - Di Pu
- Sichuan Guangya Polymer Chemical Co.; Chengdu People's Republic of China
| | - Xinmin Zhang
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
- Sichuan Guangya Polymer Chemical Co.; Chengdu People's Republic of China
| | - Zhongbin Ye
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Chengdu People's Republic of China
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
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16
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17
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Pautov V, Nekrasova T. Nanosecond dynamics of polymers with complex architecture as studied by polarized luminescence. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.03.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Hernandez-Martínez A, Lujan-Montelongo J, Silva-Cuevas C, Mota-Morales JD, Cortez-Valadez M, Ruíz-Baltazar ÁDJ, Cruz M, Herrera-Ordonez J. Swelling and methylene blue adsorption of poly(N,N-dimethylacrylamide-co-2-hydroxyethyl methacrylate) hydrogel. REACT FUNCT POLYM 2018. [DOI: 10.1016/j.reactfunctpolym.2017.11.008] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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19
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Identifying trends in hydration behavior for modifications to the hydrophobicity of poly(n-isopropylacrylamide). J Mol Graph Model 2017; 78:168-175. [DOI: 10.1016/j.jmgm.2017.09.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Revised: 09/27/2017] [Accepted: 09/28/2017] [Indexed: 11/23/2022]
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20
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Li X, Li X, Shi X, Qiu G, Lu X. Thermosensitive DEA/DMA copolymer nanogel: Low initiator induced synthesis and structural colored colloidal array’s optical properties. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.08.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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21
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Adams F, Machat MR, Altenbuchner PT, Ehrmaier J, Pöthig A, Karsili TNV, Rieger B. Toolbox of Nonmetallocene Lanthanides: Multifunctional Catalysts in Group-Transfer Polymerization. Inorg Chem 2017; 56:9754-9764. [DOI: 10.1021/acs.inorgchem.7b01261] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Friederike Adams
- WACKER-Lehrstuhl für Makromolekulare Chemie, §Chair of Theoretical Chemistry, and ‡Department Chemie & Catalysis Research Center, Technische Universität München, 85748 Garching bei München, Germany
| | - Martin R. Machat
- WACKER-Lehrstuhl für Makromolekulare Chemie, §Chair of Theoretical Chemistry, and ‡Department Chemie & Catalysis Research Center, Technische Universität München, 85748 Garching bei München, Germany
| | - Peter T. Altenbuchner
- WACKER-Lehrstuhl für Makromolekulare Chemie, §Chair of Theoretical Chemistry, and ‡Department Chemie & Catalysis Research Center, Technische Universität München, 85748 Garching bei München, Germany
| | - Johannes Ehrmaier
- WACKER-Lehrstuhl für Makromolekulare Chemie, §Chair of Theoretical Chemistry, and ‡Department Chemie & Catalysis Research Center, Technische Universität München, 85748 Garching bei München, Germany
| | - Alexander Pöthig
- WACKER-Lehrstuhl für Makromolekulare Chemie, §Chair of Theoretical Chemistry, and ‡Department Chemie & Catalysis Research Center, Technische Universität München, 85748 Garching bei München, Germany
| | - Tolga N. V. Karsili
- WACKER-Lehrstuhl für Makromolekulare Chemie, §Chair of Theoretical Chemistry, and ‡Department Chemie & Catalysis Research Center, Technische Universität München, 85748 Garching bei München, Germany
| | - Bernhard Rieger
- WACKER-Lehrstuhl für Makromolekulare Chemie, §Chair of Theoretical Chemistry, and ‡Department Chemie & Catalysis Research Center, Technische Universität München, 85748 Garching bei München, Germany
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22
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Rakhmetullayeva R, Azhkeyeva A, Yeligbayeva G, Shaikhutdynov Y, Mun G, Abutalip M. New Thermo-Sensitive Hydrogel Based on Copolymer of 2-hydroxyethyl Acrylate and Ethyl Acrylate. EURASIAN CHEMICO-TECHNOLOGICAL JOURNAL 2017. [DOI: 10.18321/ectj502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
In this work firstly the thermo-sensitive polymer hydrogels were obtained by three-dimensional radical copolymerization of water-soluble HEA and hydrophobic monomer ethyl acrylate (EA) in the presence of crosslinking agent N,N’-methylenebisacrylamide (BAA). The hydrogels with certain copolymer compositions showed thermo-sensitive behavior in aqueous solutions. The regularity of complex formation of cross-linked copolymer HEA-EA with anionic and cationic surface-active substances have been studied. The swelling behavior of the hydrogels in cetylpyridinium bromide aqueous solutions was studied. Increased swelling of the hydrogels was observed in the surfactant solutions. The increased swelling was more prominent for the hydrogels with a higher content of the hydrophobic moiety in the copolymer composition and with the higher surfactant concentration. The reason for the observed phenomenon is discussed.
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23
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Savelyeva X, Métafiot A, Li L, Bennett I, Marić M. Stimuli-responsive 4-acryloylmorpholine/4-acryloylpiperidine copolymers via nitroxide mediated polymerization. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28591] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Xeniya Savelyeva
- McGill University, Department of Chemical Engineering; McGill Institute of Advanced Materials (MIAM), Centre for Self-Assembled Chemical Structures (CSACS), Centre Recherche du Polymeres et Composites du Quebec (CREPEQ); 3610 University Street, Montréal Québec H3A 0C5 Canada
| | - Adrien Métafiot
- McGill University, Department of Chemical Engineering; McGill Institute of Advanced Materials (MIAM), Centre for Self-Assembled Chemical Structures (CSACS), Centre Recherche du Polymeres et Composites du Quebec (CREPEQ); 3610 University Street, Montréal Québec H3A 0C5 Canada
| | - Lucia Li
- McGill University, Department of Chemical Engineering; McGill Institute of Advanced Materials (MIAM), Centre for Self-Assembled Chemical Structures (CSACS), Centre Recherche du Polymeres et Composites du Quebec (CREPEQ); 3610 University Street, Montréal Québec H3A 0C5 Canada
| | - Ian Bennett
- McGill University, Department of Chemical Engineering; McGill Institute of Advanced Materials (MIAM), Centre for Self-Assembled Chemical Structures (CSACS), Centre Recherche du Polymeres et Composites du Quebec (CREPEQ); 3610 University Street, Montréal Québec H3A 0C5 Canada
| | - Milan Marić
- McGill University, Department of Chemical Engineering; McGill Institute of Advanced Materials (MIAM), Centre for Self-Assembled Chemical Structures (CSACS), Centre Recherche du Polymeres et Composites du Quebec (CREPEQ); 3610 University Street, Montréal Québec H3A 0C5 Canada
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24
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Zhang B, Zou H, Song Y, Guan H, Zhou X, Shi Z, Sheng Y. Electrospinning fabrication and luminescence properties of Lu2O2S:Eu3+fibers. CrystEngComm 2017. [DOI: 10.1039/c6ce02391f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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25
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Singha NR, Karmakar M, Mahapatra M, Mondal H, Dutta A, Roy C, Chattopadhyay PK. Systematic synthesis of pectin-g-(sodium acrylate-co-N-isopropylacrylamide) interpenetrating polymer network for superadsorption of dyes/M(ii): determination of physicochemical changes in loaded hydrogels. Polym Chem 2017. [DOI: 10.1039/c7py00316a] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Superadsorbent hydrogel with excellent physicochemical properties is used for mere/synergic chemisorption of dyes and M(ii).
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Affiliation(s)
- Nayan Ranjan Singha
- Department of Polymer Science and Technology
- Government College of Engineering and Leather Technology (Post-Graduate)
- Maulana Abul Kalam Azad University of Technology
- Kolkata – 700106
- India
| | - Mrinmoy Karmakar
- Department of Polymer Science and Technology
- Government College of Engineering and Leather Technology (Post-Graduate)
- Maulana Abul Kalam Azad University of Technology
- Kolkata – 700106
- India
| | - Manas Mahapatra
- Department of Polymer Science and Technology
- Government College of Engineering and Leather Technology (Post-Graduate)
- Maulana Abul Kalam Azad University of Technology
- Kolkata – 700106
- India
| | - Himarati Mondal
- Department of Polymer Science and Technology
- Government College of Engineering and Leather Technology (Post-Graduate)
- Maulana Abul Kalam Azad University of Technology
- Kolkata – 700106
- India
| | - Arnab Dutta
- Department of Polymer Science and Technology
- Government College of Engineering and Leather Technology (Post-Graduate)
- Maulana Abul Kalam Azad University of Technology
- Kolkata – 700106
- India
| | - Chandan Roy
- Department of Polymer Science and Technology
- Government College of Engineering and Leather Technology (Post-Graduate)
- Maulana Abul Kalam Azad University of Technology
- Kolkata – 700106
- India
| | - Pijush Kanti Chattopadhyay
- Department of Leather Technology
- Government College of Engineering and Leather Technology (Post-Graduate)
- Maulana Abul Kalam Azad University of Technology
- Kolkata – 700106
- India
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26
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Herfurth C, Laschewsky A, Noirez L, von Lospichl B, Gradzielski M. Thermoresponsive (star) block copolymers from one-pot sequential RAFT polymerizations and their self-assembly in aqueous solution. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.09.089] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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27
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Yang H, Li G, Stansbury JW, Zhu X, Wang X, Nie J. Smart Antibacterial Surface Made by Photopolymerization. ACS APPLIED MATERIALS & INTERFACES 2016; 8:28047-28054. [PMID: 27696807 DOI: 10.1021/acsami.6b09343] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
On the basis of the use of photopolymerization technology, a facile and reliable method for in situ preparation of silver nanoparticles (AgNPs) within PNIPAAm functional surfaces is presented as a means to achieve nonfouling, antibacterial films. The surface properties were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), water contact angle, and thermogravimetric analysis (TGA). The antibacterial and release properties of the surfaces were tested against E. coli: at 37 °C (above the LCST of PNIPAAm), the functional films facilitated the attachment of bacteria, which were then killed by the AgNPs. Changing temperature to 4 °C (below the LCST), swollen PNIPAAm chains led the release of dead bacteria. The results showed that AgNPs/PNIPAAm hybrid surfaces offer a "smart" antibacterial capability in response to the change of environmental temperature.
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Affiliation(s)
| | | | - Jeffrey W Stansbury
- School of Dental Medicine, University of Colorado , Denver, Colorado 80045, United States
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28
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Ng WS, Forbes E, Franks GV, Connal LA. Xanthate-Functional Temperature-Responsive Polymers: Effect on Lower Critical Solution Temperature Behavior and Affinity toward Sulfide Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7443-7451. [PMID: 27434760 DOI: 10.1021/acs.langmuir.6b00211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Xanthate-functional polymers represent an exciting opportunity to provide temperature-responsive materials with the ability to selectively attach to specific metals, while also modifying the lower critical solution temperature (LCST) behavior. To investigate this, random copolymers of poly(N-isopropylacrylamide) (PNIPAM) with xanthate incorporations ranging from 2 to 32% were prepared via free radical polymerization. Functionalization with 2% xanthate increased the LCST by 5 °C relative to the same polymer without xanthate. With increasing xanthate composition, the transition temperature increased and the transition range broadened until a critical composition of the hydrophilic xanthate groups (≥18%) where the transition disappeared completely. The adsorption of the polymers at room temperature onto chalcopyrite (CuFeS2) surfaces increased with xanthate composition, while adsorption onto quartz (SiO2) was negligible. These findings demonstrate the affinity of these functional smart polymers toward copper iron sulfide relative to quartz surfaces, presumably due to the interactions between xanthate and specific metal centers.
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Affiliation(s)
- Wei Sung Ng
- Chemical and Biomolecular Engineering, University of Melbourne , Parkville, VIC 3010, Australia
- CSIRO Mineral Resources Flagship, Clayton, VIC 3168, Australia
| | | | - George V Franks
- Chemical and Biomolecular Engineering, University of Melbourne , Parkville, VIC 3010, Australia
| | - Luke A Connal
- Chemical and Biomolecular Engineering, University of Melbourne , Parkville, VIC 3010, Australia
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29
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Karimi AR, Rahimi L, Azadikhah F, Ghadimi S. Preparation and lower critical solution temperature behavior investigation of new thermoresponsive poly( N-isopropylacrylamide-co-phthalocyanine) magnetic nanocomposites containing phthalocyanine-coated Fe 3O 4 hybrid. CAN J CHEM 2016. [DOI: 10.1139/cjc-2016-0109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
New thermoresponsive poly(N-isopropyl acrylamide-co-phthalocyanine) magnetic nanocomposites were prepared by in situ dispersion polymerization. 4-Nitrophthalic acid and CoCl2 were employed to synthesize tetranitrophthalocyanine and then it was converted to tetraaminophthalocyanine by sodium sulfide. The cobalt tetra(N-carbonylacrylic)aminophthalocyanine monomer was obtained by reaction of tetraaminophthalocyanine with maleic anhydrid. N-isopropylacrylamide as the main monomers, N,N′-methylenebisacrylamide as the cross-linker, poly(N-vinylpyrrolidone) as the steric stabilizer, potassium persulfate as the initiator, and new Fe-phthalocyanine oligomer/Fe3O4 nanohybrid particles (FePc/Fe3O4) as nanoparticles were used. The magnetite nanocomposites were characterized by Fourier-transform infrared spectrum, X-ray diffraction spectroscopy, scanning electron microscopy, thermogravimetric analysis, vibrating sample magnetometer, and differential scanning calorimetry. The results showed that the lower critical solution temperatures of the hydrogel nanocomposits were influenced by the content of FePc/Fe3O4 hybrid nanoparticles. The lower critical solution temperatures of the magnetic hydrogel nanocomposites F3 and F4 were at about 34 and 40 °C. The results show that the increase of FePc/Fe3O4 nanoparticle content caused the LCSTs of the hydrogels to increase. FePc/Fe3O4 nanoparticles were prepared from 4,4′-isopropyliden-bis-dioxydiphthalonitrile and FeCl3·6H2O via the solvothermal route. The sizes of nanoparticles were determined by scanning electron microscopy. They are spherical in shape and the average size of them is between 30 and 70 nm.
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Affiliation(s)
- Ali Reza Karimi
- Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran
- Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran
| | - Leila Rahimi
- Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran
- Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran
| | - Farnaz Azadikhah
- Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran
- Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran
| | - Sahar Ghadimi
- Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran
- Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran
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30
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Haraguchi K, Li HJ, Xu Y, Li G. Copolymer nanocomposite hydrogels: Unique tensile mechanical properties and network structures. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.04.039] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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31
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Jiang H, Zhang G, Xu B, Feng X, Bai Q, Yang G, Li H. Thermosensitive antibacterial Ag nanocomposite hydrogels made by a one-step green synthesis strategy. NEW J CHEM 2016. [DOI: 10.1039/c5nj03608a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Clay nanosheets act as a catalyst and stabilizing agent for rapid in situ synthesis of silver nanoparticles in a hydrogel matrix.
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Affiliation(s)
- Haoyang Jiang
- School of Chemical Engineering and Environment
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Gongzheng Zhang
- School of Chemical Engineering and Environment
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Bo Xu
- School of Chemical Engineering and Environment
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Xianqi Feng
- School of Chemical Engineering and Environment
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Quanming Bai
- School of Chemical Engineering and Environment
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Guoli Yang
- School of Chemical Engineering and Environment
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Huanjun Li
- School of Chemical Engineering and Environment
- Beijing Institute of Technology
- Beijing 100081
- China
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32
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Zhang B, Zou H, Guan H, Dai Y, Song Y, Zhou X, Sheng Y. Lu2O2S:Tb3+, Eu3+nanorods: luminescence, energy transfer, and multicolour tuneable emission. CrystEngComm 2016. [DOI: 10.1039/c6ce01441k] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Enomoto R, Kousaka S, Yusa SI. Preparation of a Thermo- and Photoresponsive Water-soluble Polymer. CHEM LETT 2015. [DOI: 10.1246/cl.150675] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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34
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Chen M, Sun M, Liu X. Dissipative Particle Dynamics Simulations on the Self-Assembly of New Segmented Random-Block Copolymers in Selective Solvents. J DISPER SCI TECHNOL 2015. [DOI: 10.1080/01932691.2015.1073596] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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35
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Abstract
Paper-based microfluidics provide an inexpensive, easy to use technology for point-of-care diagnostics in developing countries. Here, we combine paper-based microfluidic devices with responsive hydrogels to add an entire new class of functions to these versatile low-cost fluidic systems. The hydrogels serve as fluid reservoirs. In response to an external stimulus, e.g. an increase in temperature, the hydrogels collapse and release fluid into the structured paper substrate. In this way, chemicals that are either stored on the paper substrate or inside the hydrogel pads can be dissolved, premixed, and brought to reaction to fulfill specific analytic tasks. We demonstrate that multi-step sequences of chemical reactions can be implemented in a paper-based system and operated without the need for external precision pumps. We exemplify this technology by integrating an antibody-based E. coli test on a small and easy to use paper device.
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Affiliation(s)
- Robert R Niedl
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
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36
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Figg CA, Simula A, Gebre KA, Tucker BS, Haddleton DM, Sumerlin BS. Polymerization-induced thermal self-assembly (PITSA). Chem Sci 2015; 6:1230-1236. [PMID: 29560209 PMCID: PMC5811124 DOI: 10.1039/c4sc03334e] [Citation(s) in RCA: 280] [Impact Index Per Article: 31.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 11/14/2014] [Indexed: 12/28/2022] Open
Abstract
Polymerization-induced self-assembly (PISA) is a versatile technique to achieve a wide range of polymeric nanoparticle morphologies. Most previous examples of self-assembled soft nanoparticle synthesis by PISA rely on a growing solvophobic polymer block that leads to changes in nanoparticle architecture during polymerization in a selective solvent. However, synthesis of block copolymers with a growing stimuli-responsive block to form various nanoparticle shapes has yet to be reported. This new concept using thermoresponsive polymers is termed polymerization-induced thermal self-assembly (PITSA). A reversible addition-fragmentation chain transfer (RAFT) polymerization of N-isopropylacrylamide from a hydrophilic chain transfer agent composed of N,N-dimethylacrylamide and acrylic acid was carried out in water above the known lower critical solution temperature (LCST) of poly(N-isopropylacrylamide) (PNIPAm). After reaching a certain chain length, the growing PNIPAm self-assembled, as induced by the LCST, into block copolymer aggregates within which dispersion polymerization continued. To characterize the nanoparticles at ambient temperatures without their dissolution, the particles were crosslinked immediately following polymerization at elevated temperatures via the reaction of the acid groups with a diamine in the presence of a carbodiimide. Size exclusion chromatography was used to evaluate the unimer molecular weight distributions and reaction kinetics. Dynamic light scattering and transmission electron microscopy provided insight into the size and morphologies of the nanoparticles. The resulting block copolymers formed polymeric nanoparticles with a range of morphologies (e.g., micelles, worms, and vesicles), which were a function of the PNIPAm block length.
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Affiliation(s)
- C Adrian Figg
- George & Josephine Butler Polymer Research Laboratory , Center for Macromolecular Science & Engineering , Department of Chemistry , University of Florida , PO Box 117200 , Gainesville , FL 32611-7200 , USA .
| | - Alexandre Simula
- Department of Chemistry , University of Warwick , Coventry CV4 7AL , UK
| | - Kalkidan A Gebre
- George & Josephine Butler Polymer Research Laboratory , Center for Macromolecular Science & Engineering , Department of Chemistry , University of Florida , PO Box 117200 , Gainesville , FL 32611-7200 , USA .
| | - Bryan S Tucker
- George & Josephine Butler Polymer Research Laboratory , Center for Macromolecular Science & Engineering , Department of Chemistry , University of Florida , PO Box 117200 , Gainesville , FL 32611-7200 , USA .
| | - David M Haddleton
- Department of Chemistry , University of Warwick , Coventry CV4 7AL , UK
| | - Brent S Sumerlin
- George & Josephine Butler Polymer Research Laboratory , Center for Macromolecular Science & Engineering , Department of Chemistry , University of Florida , PO Box 117200 , Gainesville , FL 32611-7200 , USA .
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Wang Y, Kotsuchibashi Y, Liu Y, Narain R. Study of bacterial adhesion on biomimetic temperature responsive glycopolymer surfaces. ACS APPLIED MATERIALS & INTERFACES 2015; 7:1652-1661. [PMID: 25548940 DOI: 10.1021/am508792k] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen responsible for diseases such as bacteremia, chronic lung infection, and acute ulcerative keratitis. P. aeruginosa induced diseases can be fatal as the exotoxins and endotoxins released by the bacterium continue to damage host tissues even after the administration of antibiotics. As bacterial adhesion on cell surfaces is the first step in bacterial based pathogen infections, the control of bacteria-cell interactions is a worthwhile research target. In this work, thermally responsive poly(N-isopropylacrylamide) [P(NIPAAm)] based biomimetic surfaces were developed to study the two major bacterial infection mechanisms, which is believed to be mediated by hydrophobic or lectin-carbohydrate interactions, using quartz crystal microbalance with dissipation. Although, a greater number of P. aeruginosa adhered to the NIPAAm homopolymer modified surfaces at temperatures higher than the lower critical solution temperature (LCST), the bacterium-substratum bond stiffness was stronger between P. aeruginosa and a galactose based P(NIPAAm) surface. The high bacterial adhesion bond stiffness observed on the galactose based thermally responsive surface at 37 °C might suggest that both hydrophobic and lectin-carbohydrate interactions contribute to bacterial adhesion on cell surfaces. Our investigation also suggests that the lectin-carbohydrate interaction play a significant role in bacterial infections.
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Affiliation(s)
- Yinan Wang
- Department of Chemical and Materials Engineering, University of Alberta , 116 St and 85 Ave, Edmonton, Alberta T6G 2G6, Canada
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38
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Elashnikov R, Radocha M, Rimpelova S, Švorčík V, Lyutakov O. Thickness and substrate dependences of phase transition, drug release and antibacterial properties of PNIPAm-co-AAc films. RSC Adv 2015. [DOI: 10.1039/c5ra13972d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Normalized absorption coefficient at 590 nm of solutions of extracted CV from 50 nm and 500 nm thick PNIPAm-co-AAc films deposited on Au substrates. Releases were measured for temperatures below (25 °C) and above (40 °C) the LCST.
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Affiliation(s)
- R. Elashnikov
- Department of Solid State Engineering
- University of Chemistry and Technology
- Prague
- Czech Republic
| | - M. Radocha
- Department of Solid State Engineering
- University of Chemistry and Technology
- Prague
- Czech Republic
| | - S. Rimpelova
- Department of Biochemistry and Microbiology
- University of Chemistry and Technology
- Prague
- Czech Republic
| | - V. Švorčík
- Department of Solid State Engineering
- University of Chemistry and Technology
- Prague
- Czech Republic
| | - O. Lyutakov
- Department of Solid State Engineering
- University of Chemistry and Technology
- Prague
- Czech Republic
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39
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Main-chain sulphur containing water soluble poly(N-isopropylacrylamide-co-N,N′-dimethylacrylamide sulphide) copolymers via interfacial polycondensation. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.09.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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40
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Sarker P, Swindells K, Douglas CWI, MacNeil S, Rimmer S, Swanson L. Förster resonance energy transfer confirms the bacterial-induced conformational transition in highly-branched poly(N-isopropyl acrylamide with vancomycin end groups on binding to Staphylococcus aureus. SOFT MATTER 2014; 10:5824-5835. [PMID: 24974819 DOI: 10.1039/c4sm00056k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We describe a series of experiments designed to investigate the conformational transition that highly-branched polymers with ligands undergo when interacting with bacteria, a process that may provide a new sensing mechanism for bacterial detection. Fluorescent highly-branched poly(N-isopropyl acrylamide)s (HB-PNIPAM) were prepared by sequential self-condensing radical copolymerizations, using anthrylmethyl methacrylate (AMMA) and fluorescein-O-acrylate (FA) as fluorescent comonomers and 4-vinylbenzyl pyrrole carbodithioate as a branch forming monomer. Differences in reactivity necessitated to first copolymerize AMMA then react with FA in a separate sequential monomer feed step. Modifications of the chain ends produced vancomycin-functional derivatives (HB-PNIPAM-Van). The AMMA and FA labels allow probing of the conformational behaviour of the polymers in solution via Förster resonance energy transfer experiments. It was shown that interaction of this polymer's end groups with Staphylococcus aureus induced a macromolecular collapse. The data thus provide conclusive evidence for a conformational transition that is driven by binding to a bacterium.
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Affiliation(s)
- Prodip Sarker
- Department of Chemistry, Brook Hill, University of Sheffield, Sheffield, South Yorkshire, UK S3 7HF.
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41
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Zhang C, Peng H, Whittaker AK. NMR investigation of effect of dissolved salts on the thermoresponsive behavior of oligo(ethylene glycol)-methacrylate-based polymers. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27252] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Cheng Zhang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland; Brisbane St Lucia QLD 4072 Australia
| | - Hui Peng
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland; Brisbane St Lucia QLD 4072 Australia
| | - Andrew K. Whittaker
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland; Brisbane St Lucia QLD 4072 Australia
- Centre for Advanced Imaging; The University of Queensland; Brisbane St Lucia QLD 4072 Australia
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42
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Zhang C, Maric M. Statistical terpolymers with thermo-responsive fluorescence response in an ionic liquid: effects of solvatophilicity on LCST phase separation and reversibility. Polym Chem 2014. [DOI: 10.1039/c4py00300d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Wang Y, Kotsuchibashi Y, Liu Y, Narain R. Temperature-responsive hyperbranched amine-based polymers for solid-liquid separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2360-2368. [PMID: 24533692 DOI: 10.1021/la5003012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Temperature-responsive hyperbranched polymers containing primary amines as pendent groups have been synthesized for solid-liquid separation of kaolinite clay suspension. The effects of temperature, polymer charge density, and polymer architecture on particle flocculation have been investigated. Suspensions treated with the temperature-responsive amine-based hyperbranched polymers showed remarkable separation of the fine particles at a low polymer dosage of 10 ppm and at testing temperatures of 40 °C. In comparison to other polymers studied (linear and hyperbranched homopolymers and copolymers), the temperature-responsive amine-based hyperbranched copolymers showed better particle flocculation at 40 °C, as evidenced by the formation of a thinner sediment bed without compromising the amount of clay particles being flocculated. This superior solid-liquid separation performance can be explained by the hydrophobic interaction of PNIPAM segments on particle surfaces or the capture of additional free particles or small floc due to the exposure of buried positive charges (because of the phase separation of the hydrophilic amines and hydrophobic PNIPAM part) at temperatures above the lower critical solution temperature (LCST).
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Affiliation(s)
- Yinan Wang
- Department of Chemical and Materials Engineering, University of Alberta , 116 Street and 85 Avenue, Edmonton, AB T6G 2G6, Canada
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Gaballa HA, Geever LM, Killion JA, Higginbotham CL. Synthesis and characterization of physically crosslinked N
-vinylcaprolactam, acrylic acid, methacrylic acid, and N,N
-dimethylacrylamide hydrogels. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/polb.23369] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Heba A. Gaballa
- Materials Research Institute; Athlone Institute of Technology; Dublin Rd, Athlone Co. Westmeath Ireland
| | - Luke M. Geever
- Materials Research Institute; Athlone Institute of Technology; Dublin Rd, Athlone Co. Westmeath Ireland
| | - John A. Killion
- Materials Research Institute; Athlone Institute of Technology; Dublin Rd, Athlone Co. Westmeath Ireland
| | - Clement L. Higginbotham
- Materials Research Institute; Athlone Institute of Technology; Dublin Rd, Athlone Co. Westmeath Ireland
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Liu P, Tang W, Zhang H. Unusual solution phase transition trend of poly(N-isopropylacrylamide-co-bis(N-hydroxyisopropyl pyrrolidone) 2-vinylterephthalate). POLYMER 2013. [DOI: 10.1016/j.polymer.2013.06.053] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Dhanya S, Bahadur D, Kundu G, Srivastava R. Maleic acid incorporated poly-(N-isopropylacrylamide) polymer nanogels for dual-responsive delivery of doxorubicin hydrochloride. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2012.10.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Li CL, Ye XD, Ding YW, Liu SL. Kinetics of Coil-to-Globule Transition of Dansyl-Labeled Poly(N-sopropylacrylamide) Chains in Aqueous Solution. CHINESE J CHEM PHYS 2012. [DOI: 10.1088/1674-0068/25/04/389-397] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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pH- and temperature-sensitive statistical copolymers poly[2-(dimethylamino)ethyl methacrylate-stat
-2-vinylpyridine] with Functional succinimidyl-ester chain ends synthesized by nitroxide-mediated polymerization. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26247] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Al-Manasir N, Zhu K, Kjøniksen AL, Knudsen KD, Nyström B. Effects of addition of anionic and cationic surfactants to poly(N-isopropylacrylamide) microgels with and without acrylic acid groups. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2607-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nash ME, Healy D, Carroll WM, Elvira C, Rochev YA. Cell and cell sheet recovery from pNIPAm coatings; motivation and history to present day approaches. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31748f] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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