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Issue 29, 2015
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Effect of copolymer composition of RAFT/MADIX-derived N-vinylcaprolactam/N-vinylpyrrolidone statistical copolymers on their thermoresponsive behavior and hydrogel properties

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Abstract

Thermoresponsive statistical copolymers of N-vinylcaprolactam and N-vinylpyrrolidone of controlled average molar masses and composition were synthesized by RAFT/MADIX polymerization. The cloud point temperature was finely tuned in the range of temperature 36–70 °C. DSC measurements combined with statistical calculations suggest that the whole polymer chain is involved in the hydration/dehydration process rather than short polymer sequences. At high concentration, these polymers enable the formation of thermoresponsive hydrogels. Cryo-SEM analysis of these solutions showed the presence of globular substructures, with a looser 3-D network at higher VP content. This decrease of density of entanglements in the gel network could explain the decrease of mechanical properties and faster rehydration kinetics of the thermogelling polymer.

Graphical abstract: Effect of copolymer composition of RAFT/MADIX-derived N-vinylcaprolactam/N-vinylpyrrolidone statistical copolymers on their thermoresponsive behavior and hydrogel properties

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Supplementary files

Article information


Submitted
24 Apr 2015
Accepted
16 Jun 2015
First published
16 Jun 2015

Polym. Chem., 2015,6, 5233-5243
Article type
Paper

Effect of copolymer composition of RAFT/MADIX-derived N-vinylcaprolactam/N-vinylpyrrolidone statistical copolymers on their thermoresponsive behavior and hydrogel properties

X. Zhao, O. Coutelier, H. H. Nguyen, C. Delmas, M. Destarac and J. Marty, Polym. Chem., 2015, 6, 5233
DOI: 10.1039/C5PY00606F

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