单分散聚苯乙烯微球的制备及表征

Preparation and Characterization of Monodisperse Polystyrene Microspheres

应用膜乳化 -液中干燥法成功制备出粒径为 2～ 2 0 μm的单分散聚苯乙烯 ( PS)微球 .PS微球的粒径主要由膜孔径决定 ,其值约为膜孔径的 2倍 ;PS溶液的浓度对其也有一定的影响 .膜乳化过程中的压力对微球粒径的分散性有很大的影响 ,在一定压力范围内 ,粒径呈单分散 .在分散相中加入致孔剂 ,制备出表面多孔的 PS微球 .采用复乳 -液中干燥法制备出中空

Monodisperse polystyrene(PS) microspheres with the size range of 2—20 μm were prepared by membrane emulsification and subsequent drying in liquid technique using the shirasu porous glass(SPG) membrane. The PS microspheres size was about twice of the membrane pore size and was slightly affected by the PS concentration. The distribution of the PS microspheres was strongly dependent on the emulsification pressure, and in a certain pressure range, monodispersed microspheres were obtained. Furthermore, PS microspheres with pores on the surface were prepared by adding toluene into the dispersion phase. The hollow PS microspheres were obtained by drying in liquid technique based on the formation of multiple W/O/W emulsions.