Study on the Preparation of Monodisperse Polystyrene Microspheres with Narrow Size Distribution

Monodispersed polystyrene microspheres?with narrow size distribution was obtained via dispersion polymerization of styrene in the methanol medium,using AIBN and polyvinylpyrrolidone as initiator and dispersant,respectively.The microspheres were characterized by fourier transform infrared spectroscopy(FT-IR)、scanning electron microscopy(SEM)、laser particle size analysis(LPS).The influence of PVP content on microsphere products were studied.The results show that: the monomer conversion rate increases with the increase of the dosage of PVP,the particle size of PS microspheres decreases with the increase of dosage of PVP,the size distribution widen after first narrowing.When the dosage of PVP is 1.5%,the obtained PS microspheres with narrowest size distribution and best monodispersity.A series of different size of PS microspheres can be get by changing the anount of PVP.