在聚乙烯胺大分子存在条件下,以特丁基过氧化氢(TBHP/-NH₂形成氧化还原对,通过接枝聚合方法引发N-异丙基丙烯酰胺聚合,合成了壳核微凝胶粒子,采用溶液共混和冷冻—恢复法制备了聚乙烯醇/微凝胶复合水凝胶膜。通过扫描电子显微镜(SEM)和透射电子显微镜(TEM)考察了微凝胶粒子的形貌和内部结构,并研究了微凝胶粒子以及聚乙烯醇/微凝胶复合水凝胶膜的温度响应性质。结果表明,微凝胶粒子为球形结构,具有壳核结构。微凝胶以及复合水凝胶膜均表现出相似的相转变温度,并且复合水凝胶膜具有快速响应性质。

Core-shell microgels were synthesized by the grafting polymerization of N-isopropylacrylamide in the presence of the polyvinylamine using TBHP as the initiator. The poly(vinyl alcohol)/microgel composite hydrogels were also prepared by the solution mixing and the frozen-thawing method. The morphology and the inner-structure of the microgels were characterized by SEM and TEM experiments. The temperature-sensitive properties of microgels and composite hydrogels were also investigated. The results show that the microgels are spherical and have a core-shell structure. The microgels and composite hydrogels have a nearly same volume phase transition temperature and the composite hydrogels show a rapid phase transition behavior.