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用(C_2H_5)_2AlCl-CoX_2或给电子试剂(D)+C_2H_5AlCl_2-CoCl_2·4Py为催化剂,可使丁二烯聚合生成高顺式合量的聚丁二烯。但以乙基倍半卤化铝和钴化合物或其他过渡金属化合物为催化剂的丁二烯顺式定向聚合,文献尚未见报导~**。本工作证明,上述催化体系与文献[1—5]所记载的催化剂类似,也是丁二烯顺式定向聚合的良好催化剂,而且具有它自己的特性。作为倍牛卤化铝使用了(C_2H_5)_3Al_2Cl_3、(C_2H_5)_3Al_2Br_3及(C_2H_5)_3Al_2I_3,它们是通过相应的卤代乙烷和铝片直接反应制得,并经減压蒸馏。过渡金属(Co、Ni及Fe)化合物用
With (C_2H_5) _2AlCl-CoX_2 or electron donor (D) + C_2H_5AlCl_2-CoCl_2 · 4Py as catalyst, butadiene can be polymerized to produce high cis-polybutadiene. However, cis-directional polymerization of butadiene using ethyl sesquihalide and cobalt compounds or other transition metal compounds as catalyst has not been reported in the literature. This work proves that the above catalyst system is similar to the one described in [1-5] and is also a good catalyst for the cis-directional polymerization of butadiene and has its own characteristics. (C_2H_5) _3Al_2Cl_3, (C_2H_5) _3Al_2Br_3 and (C_2H_5) _3Al_2I_3, which are obtained by the direct reaction of the corresponding halogenated ethane and aluminum flakes, were distilled under reduced pressure. Transition metal (Co, Ni and Fe) compounds