以沉淀共聚的方法，合成了低分子量的ＳＭＡ交替共聚物。讨论了温度、链转移剂和引发剂浓度对共聚物特性粘数的影响。采用慢速滴加苯乙烯的方式控制反应放热，避免爆聚，同时起到控制共聚物分子量的作用，有效地避免了高温方法带来的共聚物性能不良和均相法的后处理难等缺点。 By means of precipitation copolymerization, low molecular weight SMA alternating copolymers were synthesized. The effects of temperature, chain transfer agent and initiator concentration on intrinsic viscosity of copolymers were discussed. The method of slowly dropping styrene controls the exothermic reaction, avoids explosion, and at the same time controls the molecular weight of the copolymer, and effectively avoids the poor performance of the copolymer brought by the high-temperature method and the post-treatment of the homogeneous method Disadvantages.