制备单分散交联聚苯乙烯微球共聚合动力学和粒径的研究

Studies on Kinetics of Copolymerization and Particle Size for Preparing Monodispersed Crosslinked Polystere Microspheres

以醇水为介质 ,由分散聚合制得粒径 4μm单分散交联聚苯乙烯 (CPS)微球 .研究了苯乙烯、二乙烯基苯、稳定剂、引发剂的浓度对粒子粒径及分布、聚合动力学与体系中粒子数目变化情况的影响 .在一定范围内 ,单体或交联剂质量分数的增大 ,使聚合速率增大 ,粒径增大 ,粒径分布变宽 ,粒子数目急剧减少 ;稳定剂浓度的增大 ,使粒径减小 ,粒子数目增加 ,而对粒径分布和聚合速率的影响不大 .

Mono size crosslinked polystyrene microspheres(CPS) in average diameter of 4 μm were prepared in a mixture of ethanol and water. The effects of mass fraction of styrene, divinylbenzene and stabilizer PVP on the average particle diameter( D n) and its distribution, polymerization kinetics and variation of particle numbers in the polymerization were studied. In a certain concentration range, the polymerization rate and average particle size increased with increasing the concentrations of styrene and divinylbenzene, but the particle size distributions broadened and the particle number decreased dramatically. The concentration of stabilizer has no obvious effects on the polymerization rate and particle size distribution, but the particle size decreased and the particle number increased with increasing the stabilizer PVP concentration.