Preparation of Monodisperse Polystyrene Microspheres with Micron Size

Monodisperse(coefficient of variation e≤5%)polystyrene microspheres in the size range of 1.0～10 μm were prepared by dispersion polymerization in ethyl alcohol reaction media,using polyvinylpyrrolidone(PVP)as a steric stabilizer and 2,2'-azobisizobutyronitrile(AIBN)as an initiator.The resulting polystyrene microspheres had good sphericity and smooth intact surface.Moreover,the factors affecting the preparation of large-size PS microsphere by dispersion polymerization such as the concentration of monomer,the classes of medium,stabilizers and initiators on the sizes of PS microspheres were introduced in this paper,and finally the development and application of this technique were also presented.