反相微乳液模板原位聚合制备纳米氯化银/聚甲基丙烯酸甲酯及其结构表征

用甲基丙烯酸甲酯 (MMA)作油相 ,反相胶束微乳液作为模板 ,制备了纳米氯化银 (AgCl)粒子 ,再进行原位聚合制备了纳米氯化银 /聚甲基丙烯酸甲酯 (AgCl/PMMA)复合材料 .透射电镜 (TEM )分析表明 ,纳米AgCl的尺寸为 2 0～ 80nm .扫描电镜 (SEM )测试表明纳米AgCl粒子均匀地存在于PMMA基材中 .红外分析证明 ,胶束中水和表面活性剂AOT的羰基在MMA聚合后微观环境发生变化 ,纳米粒子同聚合物之间有吸附行为 .动态力学 (DMTA)分析复合材料 ,发现纳米AgCl粒子与聚合物之间存在强烈相互作用 ,形成了中间相层 (interphaselayer) ,改变了聚合物的动态力学性能 .

Reverse Microemulsion Template Polymerization in Site and Structure Characterization of Nano-AgCl/PMMA Composites

The AgCl/PMMA nano-composite was prepared by polymerization of MMA in site through reverse microemulsion as template, in which the methyl methacrylate(MMA) was designated as oily phase instead of non-reactive functional group solvents. The advantage of this method is that nanocomposite are prepared without the process of modification of nano-particles with organic substances and dispersing them in the matrix. TEM shows that the particle size of nano-AgCl is 20~80 nm, and the scanning electron microscope (SEM) shows that nano-AgCl is dispersed in the PMMA. FTIR spectrum reveals that the micro-environment of H2O and carboxyl group has changed after the polymerization of MMA, which indicates that the interaction of nano-particle with polymer exists. DMTA spectrum results show that there is strong interaction of nano-particles with polymer chains, which restricts the mobility of polymer chains and forms an interphase layer. Ripening process affects the interaction of polymer with nano-particles. At the higher temperature ripening process, the interphase layer is overlapped and forms a continuous phase. DMTA reveals that the aqueous phase layer around the nanoparticles does not apparently affect the interaction of polymer with the nano-particles and the nano-particles acts as a cross-linker in the nanocomposite.