PREPARATION OF UNIFORM POLY(METHYL METHACRYLATE) PARTICLES BY DISPERSION POLYMERIZATION

Being different from other dispersion polymerizations which use nonpolar fatty hydrocarbons or methanol water as media,this article presents the preparation of poly(methyl methacrylate) particles in alcohol water mixture.In experiments,a certain heating way is applied: at first,the reaction occurs at a relatively high temperature for a given time; then the temperature is lowed and the reaction continues at that temperature to the end.This procedure results in a largely narrowed size distribution.The effects of initiator on the particle size and size distribution are also studied.It is found that even a small amount of KPS can decrease the size of particles and broaden the size distribution apparently.