采用半连续种子乳液聚合法合成了核壳型聚丙烯酸酯复合乳液,系统考察了引发剂(过硫酸铵)用量对乳液聚合过程中单体转化率、聚合稳定性、乳胶粒粒径及其分布、乳液黏度及Zeta电位的影响,探讨了其内在影响机制,并采用红外(FT-IR)、差示扫描量热(DSC)及透射电镜(TEM)对乳胶粒的结构进行了表征.结果表明:乳胶粒的Zeta电位随着引发剂过硫酸铵用量的增加而增大；合适的引发剂用量可使合成的复合乳胶粒粒径较小且粒径分布较窄；引发剂用量较大会使复合乳胶粒在聚合过程中发生聚并,但所得乳液在贮存过程中稳定性较好；当引发剂用量为0.4％～0.8％(占单体混合物的质量分数)时,单体均能参与反应,极少有残余,并且所得乳液呈明显的核壳结构.
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