两性引发剂VA-057引发分散聚合制备PSG微球的研究  

Study on preparation of PSG microsphere by dispersion polymerization using an amphoteric initiator VA-057

作　　者：吕京宁[1] Lv Jingning(Department of Chemistry and Chemical Engineering, Jining University, Qufu 2 7 315 5)

机构地区：[1]济宁学院化学与化工系,曲阜273155

出　　处：《化工新型材料》2016年第12期103-105,共3页New Chemical Materials

基　　金：济宁学院青年科研基金项目(2014QNKJ05);山东省自然科学基金(ZR2015PB006)

摘　　要：以苯乙烯（St）为主单体,甲基丙烯酸环氧丙酯（GMA）为功能单体,聚乙烯吡咯烷酮（PVP）为分散剂,乙醇和水的混合物为反应介质,选用两性偶氮二（N-2-羧乙基-2-甲基丙脒）水合物（VA-057）为该体系的引发剂,分散聚合制备了单分散的聚（苯乙烯-甲基丙烯酸环氧丙酯）（PSG）高分子微球。考察了单体配比、引发剂及分散剂用量、醇水比等因素对高分子微球表面环氧基团浓度、粒径及单分散性的影响。研究表明,PSG微球粒径（6~9μm）和表面环氧基团浓度（2~4mmol/g）具有可控性。单体配比中GMA含量增加,PSG微球的表面环氧基团浓度和粒径均增大。乙醇/水介质中水含量增大或引发剂用量增多,粒径变大。分散剂用量增多,粒径变小。但引发剂浓度过高或单体St与GMA的质量比〉1时,会导致粒径分布变宽。Highly monodisperse P（styrene co glycidyl methacrylate） （PSG） microspheres were prepared by disper- sion polymerization of St and GMA in ethanol medium using polyvinyl-pyrrolidone（PVP） as the stabilizer,especially in the presence of 2,2＇-Azobis[-N-（2-carboxyethyl）-2 2 methylpropionamidine] （VA 057） as an initiator in this system. Effects of monomer ratio, concentration of initiator and stabilizer, alcohol-water ratio on the concentration of epoxy groups on the sur- face of microspheres,particle size and size distribution were investigated. Results showed that the concentration of epoxy groups on the surface of microspheres （2~4mmol/g） and particle diameter （6~9μm） could controlled. The concentration of epoxy groups and the particle diameter increased with the increase of GMA amount. The particle diameter increased with the increase of water content of alcohol-water solvent,the concentration of initiator. The particle diameter decreased with the increase of stabilizer concentration. However,if the initiator concentration was too high or the monomer ratio St： GMA （wt： wt）〉1 ,PSG had wider particle size distribution.

关 键 词：苯乙烯 甲基丙烯酸环氧丙酯 分散聚合 VA-057 

分 类 号：O631.5[理学—高分子化学]