以碳酸乙烯酯为溶剂,偶氮二异丁腈( AIBN)为引发剂,采用溶液自由基聚合的方法对丙烯腈(AN)均聚合、丙烯腈/衣康酸(AN/IA)二元共聚及丙烯腈/衣康酸/丙烯酸甲酯(AN/IA/MA)三元共聚合进行了研究.考察了反应温度对丙烯腈均聚合,以及聚合单体浓度对丙烯腈共聚合的影响,在60℃合成了相对分子质量高于4.5×105、单体转化率高于85％的丙烯腈均聚物及共聚物.采用正十二烷基硫醇(DDT)和甲酰基哌啶(FP)作为链转移剂,对AN均聚物、AN/IA及AN/IA/MA共聚物的相对分子质量进行调控,考察了链转移剂浓度对聚合物相对分子质量和单体转化率的影响.结果表明,w(DDT)为0.25％时(以单体质量计),聚合物相对分子质量可有效调节到1×105,而单体转化率保持在80％以上.
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