The synthesis, characterisation, phase behaviour and swelling of temperature sensitive physically crosslinked poly(1-vinyl-2-pyrrolidinone)/poly(N-isopropylacrylamide) hydrogels

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作者：
Geever, Luke M. [1 ]
Devine, Declan M. [1 ]
Nugent, Michael J.D. [1 ]
Kennedy, James E. [1 ]
Lyons, John G. [1 ]
Higginbotham, Clement L. [1 ]
机构：
[1] Centre for Biopolymer and Biomolecular Research, Athlone Institute of Technology, Dublin Road, Athlone, Co. Westmeath, Ireland
来源：
European Polymer Journal | 2006年 / 42卷 / 01期
关键词：
Physically crosslinked complexes of polyvinyl pyrrolidinone-poly (N-isopropylacrylamide) (PVP-PNIPAAm) were prepared by photopolymerisation from a mixture of the monomers 1-vinyl-2-pyrrolidinone and N-isopropylacrylamide. IR spectroscopy and calorimetry were used to characterise the resulting xerogels. By alternating the monomer feed ratio; copolymers were synthesised to have their own distinctive lower critical solution temperature (LCST). The transition temperature of the gels was established using cloud point measurement and modulated differential scanning calorimeter (MDSC). This ability to shift the phase transition temperature of the copolymers provides excellent flexibility in tailoring transitions for specific uses. Swelling experiments were performed on the copolymer disks in distilled water at varying temperatures to establish the behaviour of the gels above and below phase transition temperature. The results obtained show that below transition temperature; the gels are water soluble but above this temperature they are slightly less water soluble; significantly less water soluble; or water insoluble; depending on the composition and LCST of the gel. © 2005 Elsevier Ltd. All rights reserved;
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页码：69 / 80
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