合成了两种阴离子型的端烯基聚氨酯(UAA)预聚物,制备了pH值敏感的水凝胶,比较了它们的pH值响应性.将UAA预聚物与N-异丙基丙烯酰胺(NIPA)共聚,得到具有温度和pH值双重敏感性的水凝胶.研究发现聚氨酯侧链的引入对NIPA的相转变温度(LCST)几乎无影响.聚合温度和组成比对所合成的水凝胶性能有较大的影响.
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