以甲基丙烯酸(MAA)和甲基丙烯酸二甲氨基乙酯(DMA)为单体,N,N'-亚甲基双丙烯酰胺(MBA)为交联剂,采用反相微乳液聚合法制备了一系列不同单体物质的量比的聚两性电解质微凝胶P(MAA-co-DMA).通过傅里叶红外光谱(FT-IR)、电位与电导滴定、动态光散射(DLS)及紫外可见分光光度法等测试手段对其进行表征与分析.研究结果表明,P(MAA-co-DMA)为两性聚合物,其实际组成与投料比一致;在低和高pH值范围,微凝胶粒子处于溶胀状态,在等电点(IEP)附近,粒子收缩,微观结构变得紧密,IEP值与理论预测值相比有所偏移;随着pH值的变化,微凝胶分散液透光率变化不明显.
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