溶剂热法制备无皂阳离子P(MMA-St)纳米胶乳粒子  

Preparation of Emulsifier-free Cationic Poly(methylmethacrylate-styrene) Nanoparticles Latex by Sovlotheraml Method

作　　者：吴华强[1] 王谦宜[1] 徐冬梅[1] 王强[1] 董泓[1] 许苗苗[1] 曹培培[1] 

机构地区：[1]安徽师范大学化学与材料科学学院,安徽芜湖241000

出　　处：《合成化学》2007年第6期693-696,共4页Chinese Journal of Synthetic Chemistry

基　　金：国家自然科学基金资助项目(20271002);安徽省自然科学基金资助项目(070414179)

摘　　要：运用溶剂热法,以丙酮-水为分散介质,偶氮二异丁基脒盐酸盐(AIBA)引发苯乙烯(St)和甲基丙烯酸甲酯(MMA)共聚,制得粒径约为40nm的无皂阳离子聚(苯乙烯-甲基丙烯酸甲酯)纳米胶乳粒子[P(MMA-St)],其结构经TEM,FT-IR,TG和DTA表征。讨论了不同引发剂[AIBA与KPS(过硫酸钾)],AIBA浓度{[AIBA]},单体总浓度{[M0]}对聚合速率的影响。结果表明:相同条件下AIBA引发聚合速率比KPS的快;随着[AIBA]的增大,聚合速率先增大后减小,而粒径先减小后增大;随着[M0]的增大,聚合速率增大;得到[M0]和[AIBA]影响聚合速率的动力学方程为:RP=kP·[M0]0.59[AIBA]0.77;[P(MMA-St)]的热稳定性显著提高。Emulsifier-free poly （ methyl methacrylate-styrene） [ P （MMA-St） ] cationic nanoparticles with an average diameter of about 40 nm were prepared in an acetone-water medium using 2,2-azobis （2-methylpropionamidine） dihydrochloride （AIBA） as the initiator by solvothermal method. The factors of influencing polymerization rate were discussed, such as different initiators（AIBA and KPS） , initiator concentration, the comonomer concentration. The P（MMA-St） was characterized by TEM, FT-IR, TG and DTA. The results show that the polymerization rate using AIBA as the initiator is faster; the polymerization rate increases first and then decreases, the particle size decreases first and then increases with concentration of AIBA increasing; the polymerization rate increases with concentration of comonomer increasing; the result of kinetics shows that the influence of comonomer concentration and initiator concentration on the polymerization rate could be expressed as： Rp = kp·[ M0 ]^0. 59 [ AIBA ]^0.77 ; the thermalstability of P（MMA-St） is improved apparently.

关 键 词：溶剂热法 无皂乳液聚合 聚(苯乙烯-甲基苯烯酸甲酯) 聚合速率 热稳定性 

分 类 号：O631[理学—高分子化学]