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丁二烯可用Ziegler催化剂进行定向聚合,其中以順式-1,4聚合最有实用意义。順式-1,4聚合所用的催化剂主要为烷基鋁卤化物-钴或镍化合物以及烷基铝-四碘化钛。如以其他钛的化合物与烷基铝组合作为催化剂,则所得产物的顺式-1,4合量不高。不久前我们找到丁基锂-四溴化钛催化剂可使丁二烯进行順式-1,4聚合。最近试验了在四氯化钛或钛酸正丁酯与三异丁基鋁組合的催化体系中加入少量碘或一碘二乙基
Butadiene can be used Ziegler catalyst for directional polymerization, which cis-1,4 polymerization of the most practical significance. The catalysts used for cis-1,4 polymerization are mainly alkylaluminum halides-cobalt or nickel compounds and alkylaluminum-titanium tetra-iodide. As with other titanium compounds and aluminum alkyl combination as a catalyst, the resulting product cis-1,4 amount is not high. Not long ago we found butyllithium - titanium tetrabromide catalyst for cis-1,4 polymerization of butadiene. Recently tested in the titanium tetrachloride or n-butyl titanate and triisobutyl aluminum combination of catalytic system by adding a small amount of iodine or monoiodine