分散聚合反应中影响聚苯乙烯微球粒径的因素

Factors influencing size of polystyrene microspheres in dispersion polymerization

采用分散聚合反应制备出微米级单分散聚苯乙烯微球,研究了在分散聚合反应中多种因素对微球粒径的影响。结果表明:分散稳定剂用量的增加使聚苯乙烯微球的粒径减小,单体和引发剂用量的增加使聚苯乙烯微球的粒径则增大。分散稳定剂和单体用量是影响聚苯乙烯微球粒径分布的两个主要因素。反应介质极性的加强使聚苯乙烯微球的粒径减小,而反应体系温度的升高则使聚苯乙烯微球的粒径增大,但是反应介质的极性和反应温度对粒径分布的影响很小。

Monodisperse polystyrene microspheres with micron size were prepared by dispersion polymerization. The factors influencing the size of polystyrene microspheres were investigated. The experimental results showed that the size of polystyrene microspheres decreased with increasing amount of stabilizer, increased with increasing amount of monomer and initiator. The amount of stabilizer and monomer were major factors influencing the size distribution of polystyrene microspheres. The size of polystyrene microspheres decreased with increase of the solvency of reaction media and the size distribution hardly changed. The size of polystyrene microspheres increased with increase of the reaction temperature and the size distribution hardly changed.