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Fast responsive and strong swelling hydrogels based on N ‐isopropylacrylamide with sodium acrylate
Author(s) -
Huang He,
Zhang Dan,
Mao Zhiping,
Yu Weidong,
Yan Haojing
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28457
Subject(s) - swelling , lower critical solution temperature , self healing hydrogels , polymer chemistry , acrylate , poly(n isopropylacrylamide) , radical polymerization , materials science , kinetics , sodium , polymerization , chemistry , chemical engineering , copolymer , polymer , organic chemistry , composite material , physics , quantum mechanics , engineering
Poly( N ‐isopropylacrylamide‐ co ‐sodium acrylate) gels with N , N ‐methylene bisacrylamde (BIS) as crosslinker were prepared by free radical polymerization method at the temperature of 35°C, which was just around the lower critical solution temperature (LSCT) of the hydrogels. The gels synthesized at 35°C demonstrated strong swellability and fast responseability when compared with the gels synthesized at the temperature of 0 and 18°C (below the LCST) and 50 and 80°C (above the LSCT). The response rate and swelling behavior of poly( N ‐isopropylacrylamide‐ co ‐sodium acrylate) gels was investigated and characterized by the temperature‐dependent swelling ratio and swelling and deswelling kinetics. The swelling behavior of the gels indicated that the synthesis temperature was the main factor when the swellability concerned and also had effect on the responseability of the resulting hydrogels. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009