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以五价钼体系合成1,2—聚丁二烯的研究,国内外均有较多的报道。研究中发现若助催化剂用卤素烷基铝,则聚合活性较低。对主催化而言,卤素含量有哪些影响,尚不十分清楚。从聚合设备防腐的角度讲,以卤素含量较少为宜。因此有必要对四价钼体系进行研究。前报指出MoCl_4与MoCl_5均不溶于加氢汽油等非极性溶剂,聚合时往往需要添加乙酸乙酯,才能使其溶解,而获得较高的催化活性。倪少儒等人在以五价钼体系进行丁二烯聚合的研究中,发现若将MoCl_5通过适当方法转化为MoCl_3R_2(R=
The pentavalent molybdenum system synthesis of 1,2-polybutadiene research, both at home and abroad have more reports. It has been found in the study that if the catalyst is used as a halogenated aluminum alkyl, the polymerization activity is low. What is the effect of the halogen content on the main catalysis is not yet clear. Antiseptic polymerization equipment from the point of view, less halogen content is appropriate. Therefore, it is necessary to study the tetravalent molybdenum system. Former report pointed out that MoCl_4 and MoCl_5 are not soluble in non-polar solvents such as hydrogenated gasoline, the polymerization often need to add ethyl acetate, in order to make it dissolved, and obtain higher catalytic activity. Ni Shauru and others in the pentavalent molybdenum system for butadiene polymerization study found that if the appropriate method of MoCl_5 into MoCl_3R_2 (R =