【摘要】 在微波辐照下分别用阳离子型自由基引发剂偶氮二异丁基脒盐酸盐 (AIBA)和阴离子型自由基引发剂过硫酸钾 (KPS)引发甲基丙烯酸甲酯 (MMA)均聚 ,合成出表面分别带有正电荷和负电荷的无皂均分散高分子微球 ,讨论了引发剂的种类、加热方式、单体的浓度对聚合反应的速率、微球的大小和均匀性等的影响。结果表明 ,AIBA引发剂有利于聚合反应速率提高 ,粒子粒径减小 ,粒子数增多 ;单体浓度增加 ,转化速率减慢 ,粒径增大。与水浴加热相比 ,微波辐照缩短反应时间 ,得到粒径较小、粒子数较多的胶乳粒子。更多还原

【Abstract】 Monodispersed polymethyl metharylate(PMMA) microspheres were synthesized by emulsifier free emulsion polymerization under the microwave irradiation. 2,2 Azobis(2 methylpropionamidine)dihydro chloride(AIBA) and potassium persulphate(KPS) were used as cationic and anionic initiators. The effects of initiator, heating ways and monomer concentration on the particle size, uniformity and polymerization rate were discussed. By using AIBA as an initiator, the diameter of particle obtained was smaller than the corresponding polymer particles initiated by KPS, but the polymerization rate was more rapid to give more particles. Increasing the monomer concentration increased the particle diameter but decreased the conversion rate and the number of particles. In comparison with the conventional heating method, microwave irradiation could shorten the polymerization time and give more particles with smaller particle diameter.更多还原