无皂阳离子MMA/HEMA胶乳粒子的制备及表征

讨论了微波辐照下带正电荷的自由基引发剂偶氮二异丁基脒盐酸盐(AIBA)引发甲基丙烯酸甲酯(MMA)和甲基丙烯酸2-羟乙酯(HEMA)共聚,用透射电子显微镜、红外光谱仪、差热分析仪等对聚合产物进行表征.结果表明: 两种单体发生了共聚反应,制得均分散、表面洁净的无皂阳离子胶乳粒子;粒子的粒径随着单体HEMA浓度的增加先减小后增加.在微波辐照下共聚反应的速率非常快,几乎所有的反应在20 min之内就能完成.随着单体HEMA浓度的增加,乳液抗电解质稳定性提高.

Preparation and Characterization of Emulsifier-free Cationic MMA/HEMA Copolymer Latex Particle

Using 2,2′-azobis isobutyramidine dihydrochloride(AIBA) as the initiator, hydrophilic monomer methylmethacrylate(MMA) and methacrylicacid 2-hydroyethylester(HEMA) copolymerized under microwave irradiation. The particles were characterized by using Transmission electron microscopy(TEM), Infrared spectroscopy(IR) and Differential thermal analysis(DTA). The results indicated that monodisperse copolymer particles were synthesized and their surfaces were clear. Increasing the concentration of HEMA, the particle size was decreased and then increased. The rate of copolymerization was very fast. All reactions finished within 20 min, which was the advantage of microwave irradiation. The electrolyte-resistance of latex stability was determined by critical coagulation concentration of electrolyte. The result was that the particles were emulsifier-free cationic particles and the latex stability was much better with the increase of the concentration of HEMA.