单分散窄分布聚苯乙烯微球的制备研究

Study on the Preparation of Monodisperse Polystyrene Microspheres with Narrow Size Distribution

以苯乙烯为单体,聚乙烯基吡咯烷酮(PVP)为分散剂,偶氮二异丁腈(AIBN)为引发剂,甲醇为分散介质,利用分散聚合法制备了微米级单分散聚苯乙烯微球。通过傅立叶红外分析(FT-IR),扫描电子显微镜(SEM),激光粒度分析(LPS)等方法对微球进行测试表征。研究了PVP用量对微球产物的影响。结果表明:单体的转化率随PVP用量的增加而增大,PS微球的粒径随着PVP用量的增大而减小,其粒径分布先变窄后变宽。当PVP用量为1.5%时微球的粒径分布最窄,单分散性最好。改变PVP用量可以得到不同粒径的PS微球。

Monodispersed polystyrene microspheres?with narrow size distribution was obtained via dispersion polymerization of styrene in the methanol medium,using AIBN and polyvinylpyrrolidone as initiator and dispersant,respectively.The microspheres were characterized by fourier transform infrared spectroscopy(FT-IR)、scanning electron microscopy(SEM)、laser particle size analysis(LPS).The influence of PVP content on microsphere products were studied.The results show that: the monomer conversion rate increases with the increase of the dosage of PVP,the particle size of PS microspheres decreases with the increase of dosage of PVP,the size distribution widen after first narrowing.When the dosage of PVP is 1.5%,the obtained PS microspheres with narrowest size distribution and best monodispersity.A series of different size of PS microspheres can be get by changing the anount of PVP.