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以MoCl3(OC8H17)2/三苯基膦作为催化剂,用偶氮二异丁腈引发苯乙烯与丁二烯的反向原子转移自由基共聚合,分别通过称重法、凝胶渗透色谱分析及核磁共振分析对聚合物的产率、相对分子质量及其分布和结构进行了测定和表征。结果表明,所得聚合物的相对分子质量与单体转化率呈线性增加关系,相对分子质量分布较宽(多分散性指数为1.7～2.0),表明该反应具有活性特征。反应溶液的紫外可见光谱分析表明该聚合机理符合反向原子转移自由基共聚合机理。所得丁二烯-苯乙烯共聚物为无规共聚物。
Reverse atom transfer radical copolymerization of styrene with butadiene was initiated with azobisisobutyronitrile using MoCl3 (OC8H17) 2 / triphenylphosphine as a catalyst. The results were analyzed by weighing method, gel permeation chromatography Nuclear magnetic resonance analysis of the polymer yield, relative molecular mass and its distribution and structure were measured and characterized. The results showed that the relative molecular mass of the obtained polymer increased linearly with the monomer conversion, and the molecular weight distribution was relatively wide (polydispersity index was 1.7-2.0), indicating that the reaction was active. The UV-Vis spectra of the reaction solution show that the polymerization mechanism conforms to the inverse atom transfer radical copolymerization mechanism. The resulting butadiene-styrene copolymer is a random copolymer.