Abstract: 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.

Key words: Membrane emulsification, Drying in liquid, Polymer microspheres, Monodisperse