摘要
以苯乙烯(St)和丙烯酸(AA)为单体,过硫酸钾(KPS)为引发剂,采用无皂乳液聚合法合成了单分散阴离子聚苯乙烯(PS)微球,并对微球结构和影响单分散性的因素进行了研究。结果表明,AA单体也已共聚到聚合物链上,AA的加入使PS微球粒径减小,并赋予PS微球表面负电性;聚合反应的活化能为42.95kJ/mol,升高聚合温度提高了反应速率;随着KPS用量的增加,PS微球粒径减小,在用量为0.6%时呈现最好单分散性;随着反应介质中丙酮含量增加,聚合物在介质中溶解度增加,使PS微球粒径有所减小,但微球粒径分布有所变宽。
The monodispersed anionic polystyrene （PS） microspheres were synthesized via emulsifier free emulsion polymerization with polystyrene （PS） and acrylic acid （AA） as monomers. The effect on PS microspheres structure and monodispersity was discussed. The results indicate that the copolymer has been prepared and AA comonomer makes the size of PS particles decrease and endow the particle surface electronegative. It is also observed that the polymerization activation energy is 42.95kJ/mol and the reaction rate increases with the polymerization temperature raising. With the increasing of KPS amount, the particle size also decreases and exhibits the optimum monodispersity when the amount of KPS reaches 0.6%. Additionally, with the increase of acetone amount, the solubility of polymer increases which induce the particle size to decrease and the size distribution to become broader.
出处
《高分子通报》
CAS
CSCD
北大核心
2013年第5期60-64,共5页
Polymer Bulletin
基金
湖北省自然科学基金重大项目(2009CDA030)
湖北省自然科学基金项目(2010CDB05807)
关键词
阴离子PS微球
无皂乳液聚合
单分散
Anionic polystyrene mierosphere
Emulsifier-free emulsion polymerization~ Monodispersity
