对乙烯基苯磺酰氯与苯乙烯的原子转移自由基共聚合制备支化聚苯乙烯

Synthesis of highly branched polystyrene via atom transfer radical polymerization with p-styrenesulfonyl chloride as an initiator

以对乙烯基苯磺酰氯作为引发剂进行了苯乙烯的原子转移自由基聚合 ,由于对乙烯基苯磺酰氯同时含有可聚合的乙烯基和原子转移自由基聚合引发基团 ,因此可以得到支化结构的聚苯乙烯。用凝胶渗透色谱对不同对乙烯基苯磺酰氯浓度下所得聚合物的分子量及其分布进行了表征 ,发现所得聚合物的平均分子量明显大于按照每个对乙烯基苯磺酰氯分子产生一个聚合物链计算的理论分子量 ,并且分子量呈多峰分布。

Highly branched polystyrene was prepared by atom transfer radical polymerization of styrene with p-styrenesulfonyl chloride as an initiator. The molecular weights and molecular weight distributions of the polymers obtained at different ratios of the initiator to the monomer and different monomer conversions were determined by gel permeation chromatography. It was found that the molecular weights were higher than the calculated ones by assuming that one polymer chain was generated per p -styrenesulfonyl chloride molecule, and that the molecular weight distributions were broad with multi-peaks.