Preparation of monodisperse polystyrene particles by radiation-induced dispersion polymerization

Monodisperse microspheres of polystyrene with diameters in the size range 1 -2.2(mu m) were prepared by the radiation-induced dispersion polymerization . The polystyrene microspheres by radiation-induced in the presence of co- solvent (DMSO-H2O) was investigated as functions of various factors such as irradiation time, irradiation dose rate, the amount of water and on or not stirring et al. The number of the nuclei produced in the early stage of th e polymerization was found to be constant during the remainder of the polym erization. The nuclei grow to be monodisperse polymer particles without agg regation under appropriate conditions. This is attributed to the low mobili ty of the growing polymer particles.