Preparation of monodispersed porous polystyrene microspheres by using membrane emulsification technique

To solve the problem of polydispersed microspheres from traditional preparation technique,a series of porous polystyrene microspheres with the size of 12~20 μm and the coefficient of variation within 20% were prepared by membrane emulsification technique.The surface and the aperture of porous microspheres were studied by SEM.Experimental results showed that membrane pore size was the determining factor for the size of microspheres,and suitable concentrarion of transmembrane pressure,concentration of dispersing agent and emulsifying agent were also important factors for polymerizing monodisperse microspheres.The average pore size of microspheres was 0.12 μm at the concentrartion of porogenic agent(dibutyl phthalate) of 20%.