1976年F.Dawans在研究丁二烯定向聚合时,曾引入三氟乙酸氯化镍类型的乙醚络合物,对聚合机理作了令人满意的解释并已得到实际应用。但迄今为止,稀土催化剂作为定向聚合催化剂,在三烷基铝低用量条件下,均系非均相的三元体系。这在理论研究和实际应用上都存在一定困难。 In 1976 F. Dawans studied the directional polymerization of butadiene, the introduction of trifluoroacetic acid ethyl chloride type of ether complex, the polymerization mechanism was satisfactorily explained and has been put into practical application. However, so far, the rare earth catalyst as a directional polymerization catalyst, in the low amount of trialkyl aluminum conditions, are heterogeneous ternary system. This has some difficulties in theoretical research and practical application.