单分散中空聚苯乙烯微球制备

Preparation of monodispersed hollow polystyrene microspheres

采用搅拌乳化方法制备水包油（W1／O）型乳状液，经膜乳化法制得单分散的复乳（W1／O／W2）型乳状液，再通过液中干燥法制得单分散中空聚苯乙烯（PS）微球。考察了shirasu porous glass（SPG）膜孔径对乳状液液滴粒径及粒径分布、表面活性剂浓度对PS微球中空率和单分散性的影响。由激光粒度分析仪结果及PS微球的SEM照片证实，制得的PS微球，粒径呈单分散，是SPG膜孔径的2．0～2．4倍且具有中空结构。

The monodispersed water in oil in water （W1/O/W2） multiple emulsion was prepared by dispersing the water in oil （W1/O） emulsion obtained by stirring into the continuous phase through the SPG（shirasu porous glass） membrane. Subsequent solvent evaporation was followed and monodidpersed hollow polystryrene （PS） microspheres were successfully prepared. The effect of the mean pore diameter of SPG membrane on the size and size distribution was investigated. Furthermore, the effect of surfactant concentration on the porosity and monodispersity of PS microspheres was discussed. According to the results of particle size analyzer and SEM images, the monodispersed hollow PS microspheres obtained are 2.0-2. 4 times of the mean pore size of SPG membrane.