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希土元素属于周期表中IIIA族的过渡金属,其卤化物有可能与烷基铝组成双金属络合物(Ziegler型催化剂),对烯烃的加成聚合具有催化活性。但迄今为止,除对乙烯的线型聚合以外,在文献中尚未见到将希土化合物用作定向聚合催化剂的报导。我们研究了希土化合物与烷基铝组成的非均相催化体系对丁二烯定向聚合的催化活性,发现有些体系定向效应很高。聚合是在除去微量氧和水分的氮气氛中进行的。丁二烯(纯度>99％克分子)的苯(分析纯)溶液流经活性氧化铝柱以除去水分及其他杂质。先在干燥的聚合反应瓶中称入一定量的希土化合物,
The rare earth element belongs to the transition metal of group IIIA of the periodic table, and its halide may possibly form a bimetallic complex with aluminum alkyl (Ziegler-type catalyst), which has catalytic activity for olefin addition polymerization. However, to date, except for the linear polymerization of ethylene, there has been no report in the literature of the use of a rare earth compound as a directional polymerization catalyst. We investigated the catalytic activity of heterogeneous catalysis system consisting of a rare earth compound and an aluminum alkyl on the directional polymerization of butadiene and found that some systems have high directional effect. The polymerization is carried out in a nitrogen atmosphere with traces of oxygen and moisture removed. A benzene (analytically pure) solution of butadiene (> 99 mole% purity) flows through the activated alumina column to remove moisture and other impurities. First in a dry polymerization reaction vessel weighed a certain amount of rare earth compounds,