【摘要】 采用多段乳液聚合法制备了聚(甲基丙烯酸甲酯-丙烯酸正丁酯-甲基丙烯酸)/聚(苯乙烯-丙烯腈)核壳乳液,然后用碱溶胀处理得到了单分散性较好的中空聚合物微球。以透射电子显微镜(TEM)和扫描电子显微镜(SEM)对各阶段乳液聚合的胶粒大小和分布以及形貌行了表征。研究了种子乳液聚合反应时间、搅拌速度、单体滴加速度等因素对中空聚合物微球的形态及粒径分布的影响。结果表明:当单体的滴加速度控制在0.1~0.2 g/min,搅拌速度控制在80~120 r/min时,可以制备中空形态较好的中空聚合物微球。更多还原

【Abstract】 The core/shell latex microspheres of P(methyl methacrylate-buthyl acrylate-methyl acrylic acid)/P(styrene-acrylonitrile) copolymer were synthesized by multi-step emulsion polymerizations.The core/shell copolymer microspheres thus produced were treated with alkali thickening to obtaine a mono-dispersed hollow copolymer microspheres.The sizes and their distributions as well as morphologies of polymer microspheres at various emulsion polymerization steps were characterized by TEM and FESEM.The effects of reaction time of seed emulsion polymerization,stirring rate,dosages and feeding rate of monomer on the morphology of hollow copolymer microspheres,diameters and their distributions were studied.The results showed that the hollow latex particles with largest volume expansion can be obtained when monomer feeding rate is 0.1-0.2 g/min,stirring rate is 80-120 r/min.更多还原