溶剂热法制备小粒径无皂MMA/St共聚纳米胶乳粒子  

Preparation of Emulsifier-free MMA/St Copolymer Nanoparticle Latex via Solvothermal Method

作　　者：段应军[1] 吴华强[1] 王俊恩[1] 袁品仕[1] 

机构地区：[1]安徽师范大学化学与材料科学学院,芜湖241000

出　　处：《应用化学》2005年第12期1295-1299,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20271002);安徽省教育厅自然科学基金(2003kj140)资助项目

摘　　要：采用溶剂热法,以丙酮-水为混合溶剂,过硫酸钾(KPS)为引发剂引发甲基丙烯酸甲酯(MMA)和苯乙烯(St)共聚,制得了粒径约为31 nm的共聚无皂纳米粒子。系统地探讨了温度、丙酮含量、单体比和引发剂浓度对聚合速率、粒子粒径、单分散性和乳液稳定性的影响。结果表明,随着温度的升高,粒径先减小后增大,在90℃时出现最低值;随着丙酮含量和MMA/St比例的增加,粒径由267 nm减小到34 nm,乳液稳定性提高,反应后期转化速率随丙酮含量的增加而明显下降;随着KPS浓度的增加,粒径先减小后增大。Emulsifier-free poly （styrene-methylmethacrylate） （ P （St-MMA） ） copolymer nanoparticles with an average diameter of about 31 nm were synthesized in an acetone-water medium with potassium persulfate （KPS） as the initiator by solvothermal method. The effects of amount of acetone, MMA/St ratio, the concen- tration of KPS and temperature on the polymerization rate, the particle size and the size distribution as well as the stability of the latex were investigated systematically. The results indicate that with increasing temperature, the particle size decreases first, and then increases and reaches a minimum at 90℃ ; with increasing the volume fraction of acetone or the volume ratio of MMA to St, the particle size decreases from 267 nm to 34 nm and the electrolyte-resistance stability of the latex increases; the polymerization rate in the last reaction stage falls down on increasing the volume fraction of acetone; with increasing the KPS concentration, the particle size decreases first and then increases. The solvothermal mothod has offered a new route to emulsifer-free macromolecule nanoparticles.

关 键 词：溶剂热法 无皂乳液聚合 纳米粒子 聚(苯乙烯-甲基丙烯酸甲酯) 

分 类 号：O631[理学—高分子化学] TQ330[理学—化学]