中文摘要：

进行了苯乙烯的间歇-半连续RAFT细乳液聚合,考察了半连续段的起点、单体滴加速率及最终胶乳固含量的影响。结果发现：从最终胶乳的稳定性考虑,半连续聚合的起点选择在间歇聚合的高转化率时期更好;若综合考虑胶乳的稳定性、分子量及其分布、固含量、乳化剂及共稳定剂在胶乳中的残留率等因素,半连续聚合的起点可适当提前,但必须在间歇聚合成核期结束后。过早容易引起乳液的失稳;过迟会延长反应时间,降低聚合物的制备效率,导致死聚物链含量升高。聚合体系的稳定性与胶乳的固含量密切相关,最终固含量不宜超过40%。采用间歇-半连续二段聚合工艺可以制得窄分子量分布（PDI=～1.3）,低乳化剂及共稳定剂残留量（～1.5%,质量）的高分子量聚合物（^-Mn≈8×10^4g.mol^-1）。

英文摘要：

A batch-semi-batch two-stage reversible addition-fragmentation chain transfer（RAFT）mini-emulsion polymerization of styrene was investigated.It was found that the starting point of the feeding stage（the semi-batch stage）and the solid content of the final latex were critical to reducing the amount of coagulum.The monomer feeding of the second stage should start after monomer conversion 40% of the first stage and the solid content of the final latex should remain below 40%.Under such conditions little coagulum was observed.It was concluded that the two-stage semi-batch RAFT mini-emulsion polymerization was effective to synthesize higher molecular weight polymer（～8×104 g·mol^-1）with narrow molecular weight distribution（PDI=～1.3）and low residues of the surfactant and co-stabilizer（～1.5%,mass）.