摘要
不论以WOCl_4与ROH的交换产物,还是以WOCl_4用微量乙酸乙酯溶解为主催化剂,用Al(i—Bu)_3或Al(i—Bu)_2OAr做助催化剂,在加氧汽油溶剂中使丁二烯聚合,得到的聚合物仍是高1,2—链节含量的聚丁二烯。 Al(i—Bu)_3为助催化剂,其AL/W比仅在3～10之间有催化活性,3～5活性最佳,范围较窄。而以Al(i—Bu)_2OAr为助催化剂时,在较宽的Al/W比范围内部有催化活性。前者所获聚合物分子量略高,1,2—链节含量相近,均在80—90％之间。由于聚合速度慢,本体聚合WOCl_4用量可降低一个数量级,分子量大大提高,[η]值达3—4。
Using either the interchange product of WOCl_4 with ROH (mol·ratio 1: 4)or the solution of WOCL_4 in a little amount of ethyl acetate as the major catalyst, and AL(i—Bu)_3 or Al(i—Bu)_2OAr (—OAr) as the minor catalyst, the polymerization of butadiene in hydrogenated gasoline indicated some novel results. The polymer obtained with the catalyst system mentioned was still a polybutadiene of high 1, 2—content, usually 80—90％。 When taking Al(i—Bu)_3 as the minor catalyst, the polymerization showed a catalyst activity range of Al/W=3—10, and the highest range was rather narrow (Al/W=3—5). However, when Al (i—Bu)_2 OAr was used as the minor catalyst, it turned out that there was a wide Al/W range in which the catalytic activity altered little. By means of bulk polymerization of butadiene, a much higher catalytic activity was gainde. The amount of the major catalyst used could decrease by one order of magnitue with a polymer yield of 80—85％. the molecular Weight of the polymer increased largely with[η]=3—4dL/g and a slightly broadende distribution.
出处
《弹性体》
CAS
1991年第2期1-5,共5页
China Elastomerics
基金
自然科学基金
