Dispersion Copolymerization of Styrene and Other Vinyl Monomers in Polar Solvents

摘要

Dispersion polymerization is a very attractive method for preparing mi- crometer-size monodisperse polymer particles. The applications of micr6spheres have been greatly expanded by the use of copolymers. Here, the dispersion copolymerization of styrene and seven other vinyl monomers was carried out in polar solvents. The effect of the different comonomers on the particle size was systematically investigated. The particle size first decreased and then increased with an increasing fraction of acryl- amide in the monomer feed, and at a higher fraction of such a comonomer, only a gel-Iike polymer was obtained. The particle size also increased with the increase in the contents of the hydrophilic comonomers in the monomer mixtures, and the copolymer molecular weight decreased meanwhile. Although the amount of the hydroph-obic comonomer in the monomer mixture changed, the particle size was hardly affected.