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1,4-顺式聚丁二烯因为具有与天然橡胶相似的结构,因之是一种极有发展前途的合成橡胶。目前国际化学界对于这种合成橡胶的制备方法研究得十分广泛。一般比较成功的聚合方法,大多采用以下几种催化系统(1)四碘化钛-烷基铝;(2)四氯化钛-碘-烷基铝;(3)烃氧基钛-二烷基铝卤化物。意大利的一些化学家最近经过一系列的对比试验,认为丁二烯规化聚合的催化剂,一般是三元系统比二元系统的为好。他们曾经以Al(C_2H_5)_3·Al(C_2H_5)_2I·TiCl_4为催化剂进行丁二烯的规化聚合,克分于比为Al(C_2H_5)_3:Al(C_2H_5)_2I:Ii=4:4:1,从甲苯为溶剂,在-5℃下
1,4-cis-polybutadiene because of its natural rubber with a similar structure, it is a very promising synthetic rubber. At present, the international community for the preparation of synthetic rubber has been very extensive research. Generally, the most successful polymerization methods are as follows: (1) Titanium tetra-iodide-alkyl aluminum; (2) Titanium tetrachloride-iodide-alkyl aluminum; (3) Titanium alkoxide- Aluminum halides. Some Italian chemists recently conducted a series of comparative experiments that the catalysts for the polymerization of butadiene are generally ternary systems better than binary systems. They used the Al (C_2H_5) _3 · Al (C_2H_5) _2I · TiCl_4 catalyst as the catalyst for the butadiene polymerization, the molar ratio of Al to (C_2H_5) _3: Al (C_2H_5) _2I: Ii = 4: 4: 1, from toluene as solvent at -5 ° C