Phase transition in hydrogels of thermoresponsive semi-interpenetrating and interpenetrating networks of poly(N,N-diethylacrylamide) and polyacrylamide
作者： Lenka Hanyková , Jiří Spěváček , Marek Radecki , Alexander Zhigunov , Hana Kouřilová
DOI: 10.1016/J.EURPOLYMJ.2016.10.010
关键词:
摘要: Abstract Temperature-induced phase transition in hydrogels of semi-interpenetrating (SIPNs) and interpenetrating (IPNs) polymer networks thermoresponsive poly(N,N-diethylacrylamide) (PDEAAm) hydrophilic polyacrylamide (PAAm) was studied by a combination 1H NMR spectroscopy, small-angle neutron scattering (SANS) DSC. The effect various network composition reverse sequence the preparation procedure on volume examined. Transition temperature linearly increased with content PAAm component SIPNs IPNs. SANS results revealed investigated SIPN IPN two types regions (aggregates), small large. At above large are related to compact multi-chain aggregates smooth fuzzy surface, respectively. From it follows that individual groups participated extent dependently type hydrogel preparation. We found parameters tunable not only IPNs but also process. A certain portion water bound globular structures slow exchange regime between “bound” “free” were established methods for all hydrogels.
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