分散聚合法制备二氧化硅/ 聚苯乙烯单分散复合微球

SILICON DIOXIDE/ POLYSTYRENE MONODISPERSE COMPOSITE MICROSPHEREBY DISPERSION POLYMERIZATION

摘要: 在醇/ 水混合介质中用分散聚合方法制备二氧化硅/ 聚苯乙烯单分散复合微球。探讨了分散聚合法制备无机/ 有机复合微球的过程, 考察了分散聚合反应的动力学过程。SEM 和TEM 观察结果表明: 在醇/ 水混合介质中, 用PVP K-30 作为稳定剂, 用分散聚合法制备了单分散的以二氧化硅为核、聚苯乙烯为壳的复合微球,成功实现了聚苯乙烯对二氧化硅的包覆, 复合微球的平均粒径为1.25μm , 分散系数ε为0.035 , 达到了单分散水平。还考察了稳定剂的浓度对复合微球粒径的影响, 当稳定剂PVP K-30 浓度增加时, 发现微球的粒径有所减小, 而微球的单分散性提高。

Abstract: The silicon dioxide (SiO₂ ) / polystyrene ( PS) composite microspheres were prepared by dispersion polymerization in ethanol/ water medium. The process of dispersion polymerization was investigated , and the kinetics ofdispersion polymersion with nano-SiO₂ in the reaction system was studied. The samples were characterized by microscopy techniques (SEM ,TEM) . It is shown that nano-SiO₂ particles are encapsulated by PS af ter dispersion polymerization in ethanol/ water medium using polyvinylpyrrolidone ( PVP K-30) as stabilizer. The average size of thecomposite microsphere is 1.25μm and the dispersion coefficientεis 0.035. The effect s of stabilizer concent ration onthe size of the microspheres were studied.