细乳液法合成单核核壳结构氧化硅/聚苯乙烯复合微球

Synthesis of silica/polystyrene monocore-shell nanocomposite particles via miniemulsion polymerization

采用细乳液聚合法,以3-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)表面改性的直径50nm的氧化硅粒子为核,在乳化剂、助乳化剂、引发剂存在的情况下制备了小粒径、单核核壳结构氧化硅/聚苯乙烯纳米复合微球。研究表明,苯乙烯的浓度、超声细乳化时间,是制备这种小粒径、单分散、单核核壳结构的氧化硅/聚苯乙烯纳米复合微球的关键因素。透射电镜(TEM)的观察显示,在优化的实验条件下,可以制得平均粒径95nm,壳厚20nm,粒径均一、球形规整度较好、单核核壳结构的氧化硅/聚苯乙烯纳米复合微球。其平均粒径远低于用其它聚合方法制备的复合微球。

The silica/Polystyrene monocore-shell nanocomposite particles （95nm in diameter） were synthesized through miniemulsion polymerization by using sodium dodecyl sulfate surfactant （SDS）, hexadecane costabilizer in the presence of silica particles （50nm in diameter） coated with methacryloxy（propyl）trimethoxysilane. Mono- core-shell nanocomposite particles were obtained depending on the monomer concentration and the ultrasonication time employed. By adjusting these parameters, it was possible to obtain silica/polystyrene monocore-shell nanocomposite particles.