【摘要】 由种子乳液聚合法合成了具有高硅含量 (m(有机硅 )∶m(丙烯酸酯 ) =7∶6)的核 /壳结构聚硅氧烷 /甲基丙烯酸甲酯的复合粒子。研究了乳化剂类型与浓度、反应温度、引发剂浓度和聚合方法等工艺条件对聚合动力学、复合粒子的粒径分布及形貌的影响。结果表明 ,采用m(SDS)∶m(OP 1 0 ) =1∶1的复合乳化剂可以获得粒径小 ( 1 0 0nm)、分布窄的稳定复合乳液 ;随着乳化剂浓度的增加 ,乳液粒子粒径变小、单体转化率增加 ;提高催化剂、引发剂浓度将会提高单体转化率 ;相对一次投料法 ,由甲基丙烯酸甲酯单体滴加的种子乳液聚合法合成的复合粒子粒径均一、形态规整、具有明显的核 /壳结构。更多还原

【Abstract】 The high organosilicone content(m(polysiloxane)∶m(MMA)=7∶6) polysiloxane/acrylates copo- lymer latex with core-shell structure was prepared by seeding emulsion polymerization from methyl methacrylate(MMA) with polysiloxane latex as a seed. The effects of feeding mode of MMA and preparation conditions(temperature, concentrations of initiator, reaction time) on the kinetics of polymerization, the average particle size and its distribution, and the morphology of the obtained particles were studied. The composite emulsifier of sodium lauryl sulphate and OP-10 appeared to be a preferable emulsifier system in the preparation of polysiloxane/MMA copolymer latex with the excellent storage. The increase of polymerization temperature, concentrations of initiator and emulsifier increases the polymerization rate. Higher concentration of emulsifier gave smaller size. In comparison with single polymerization, the seeding polymerization process with MMA was more preferable for preparing a stable copolymer latex with smaller particle size and narrower distribution. The TEM photos show that the composite particles have clear core/shell structure, but the particles obtained by single polymerization have irregular shape.更多还原