期刊
POLYMER
卷 42, 期 16, 页码 6851-6857出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0032-3861(01)00143-4
关键词
pH/temperature-responsive; comb-type graft; semi-interpenetrating polymer network
Thermo- and pH-sensitive comb-type graft and semi-IPN hydrogels were prepared by using alginate and poly(N-isopropylacrylamide) (PNIPAAm), Comb-type graft hydrogels are composed of crosslinked alginate network and grafted with PNIPAAm. They exhibited fast pH and thermal responses due to free and mobile graft chains. Comb-type graft hydrogels reached an equilibrium swelling and deswelling states within about 10 min. By contrast, semi-interpenetrating polymer network (semi-IPN) hydrogels formed polyelectrolyte complex between carboxyl groups in alginate and amino groups in PNIPAAm-NH2, resulting in a relatively compact structure and slow swelling and deswelling compared with comb-type graft hydrogel. All the hydrogels exhibited a reasonable sensitivity to temperature, pH and ionic strength of the swelling medium. (C) 2001 Elsevier Science Ltd. All rights reserved.
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