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A novel polyurethane‐modified poly( N ‐isopropylacrylamide) hydrogels
Author(s) -
Liu Xiaohua,
Tang Liming,
Dai Yu,
Wang Xiaogong,
Liu Deshan
Publication year - 2002
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.181
Subject(s) - lower critical solution temperature , self healing hydrogels , poly(n isopropylacrylamide) , copolymer , polymer chemistry , polyurethane , swelling , materials science , polymerization , radical polymerization , acrylate , chemical engineering , polymer , composite material , engineering
Two kinds of vinylic‐capped urethane acrylate anionomer (UAA) prepolymers were prepared in two steps. pH sensitive hydrogels were synthesized by free radical polymerization of UAA. A series of pH and temperature sensitive hydrogels were prepared by copolymerization of N ‐isopropylacrylamide (NIPA) and UAA at various ratios. The influences of pH and temperature on the swelling ratios (SRs) of these hydrogels were investigated in detail. The results indicated that the incorporation of PUAA into the composite hydrogels had little effect on the lower critical solution temperature (LCST) of poly‐(N‐isopropylacrylamide) (PNIPA). The swelling ratios strongly depended on both the composition of the hydrogels and the polymerization temperature. Copyright © 2002 John Wiley & Sons, Ltd.