Abstract
AbstractTwo 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.
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