5 years ago

Hydrogels with Dual Thermoresponsive Mechanical Performance

Hydrogels with Dual Thermoresponsive Mechanical Performance
Alba Marcellan, Nicolas Sanson, Cécile Mussault, Dominique Hourdet, Hui Guo
Dual thermoresponsive chemical hydrogels, combining poly(N-isopropylacrylamide) side-chains within a poly(N-acryloylglycinamide) network, are designed following a simple and versatile procedure. These hydrogels exhibit two phase transitions both at low (upper critical solution temperature) and high (lower critical solution temperature) temperatures, thereby modifying their swelling, rheological, and mechanical properties. These novel thermo-schizophrenic hydrogels pave the way for the development of thermotoughening wet materials in a broad range of temperatures. Original chemical hydrogels combining antagonistic upper critical solution temperature and lower critical solution temperature polymers are elaborated via free radical polymerization. Rheological and mechanical experiments performed under isochoric conditions show a thermoinduced reinforcement both at low and high temperatures induced by the formation of phase-separated polymer domains acting as organic reinforcing filler.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/marc.201700287

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