【摘要】 将合成的聚氨酯预聚体可聚合乳化剂 (APUA)用于甲基丙烯酸甲酯 (MMA)乳液聚合体系中 ,研究了不同引发剂体系和乳化剂对聚合体系的聚合稳定性和动力学影响 ,并与SDS乳化剂进行了对照。结果显示 ,用油溶性引发剂 (AIBN)和水溶性引发剂 (K2 S2 O8)都能引发该体系的聚合反应 ,而且聚合速率和转化率都相当高。用AIBN作引发剂时 ,APUA和SDS两种乳化剂所对应的动力学曲线不同 ,但APUA比SDS的聚合速率大得多 ,其分别类似于微乳液聚合 (miniemulsion)和微悬浮聚合 (microsuspen tion) ,且聚合过程中会产生一定的凝胶。当乳化剂APUA用量适合时 ,凝胶量极少 ,聚合体系是稳定的 ;而当用K2 S2 O8作引发剂时 ,两乳化剂对应动力学曲线相似 ,聚合过程不产生凝胶。但当引发剂用量较大并以APUA作乳化剂时 ,在聚合过程中会出现全部粒子突然粗化现象 ,而以SDS作乳化剂没有出现这一现象。更多还原

【Abstract】 Anionic polymerizable urethane acrylate emulsifier APUA was synthesized and applied to emulsion polymerization of MMA. Polymerization stability and polymerization kinetic were studied at different initiators and emulsifier concentrations. And SDS was used in comparative studies. It was found that both water soluble initiator K 2S 2O 8 and oil soluble initiator AIBN can start the reaction of MMA, polymerization rate and yield were very high. When AIBN was used, the conversion time behavior differed for the two surfactants, it showed different nucleation mechanism, and polymerization stability was good when the amount of AUPA was proper. When K 2S 2O 8 was used, the conversion time behavior was similar.更多还原