【摘要】 以Ti（n-C₈H₁7O）₄-Al（i-C₄H₉）_s为催化剂合成1,2-聚丁二烯,采用Ti-Bd-Al三组分陈化方式,考察了陈化温度和时间对聚合的影响。结果发现,Ti:Bd:Al=1:20:10,在90℃高温下陈化0.5h;或Ti:Bd:Al=1:20:15,75℃陈化1.5h,Ti的催化活性较催化剂组分单加或室温陈化提高50％以上,而Al的用量却降低了50—70％,所得聚丁二烯的分子量高,分子量分布较窄,凝胶含量也较低。动力学研究表明,高温陈化引起的催化活性提高,不是因为提高了催化剂的利用率,而是由于形成的活性种有较大的增长速率常数。更多还原

【Abstract】 When 1,2-polybutadiene was synthesised with Ti (n-C8H17O4)-Al ( i-C4Hg ) 3 system as catalyst, the triad high temperature aging method of Ti-Bd-Al was adopted. On conditions that Ti : Bd : Al = 1 : 20 : 10, temperature is 90℃ and aging period is 0.5 h , the catalyst activity of polymerization of butadiene can increase by more than 50% than when the catalyst components are fed one by one or when aging proceeds under room temperature. On the other hand, the dosage of triisobutylaiuminum may decrease by 50-70%.The molecular weight of obtained 1,2-polybutadiene is higher, the molecular weight distribution is narrower and the gel content less than by usual feeding method. The kinetic study showed that the increase of catalyst activity with high temperature aging method is due to the increase of propagation rate constants rather than the increase of efficiency of the catalyst.更多还原