【摘要】 当反应温度在20—50℃,反应时间大于20小时时,用1摩尔间二异丙烯基苯与2 摩尔正丁基锂在环己烷中进行加成反应,生成的加成物可以在非极性溶剂中用作双官能度阴离子聚合引发剂。用紫外光谱、气相渗透、凝胶渗透色谱以及端基分析等方法,研究了该双阴离子引发剂的有效性;并用紫外光谱法研究了该引发剂引发丁二烯和苯乙烯,聚苯乙烯活性链引发了二烯或聚丁二烯活性链引发苯乙烯的反应动力学。结果表明,对单体均为一级反应;对苯乙烯的表观引发反应速率大于对丁二烯的;而少量乙二醇二甲醚的存在能够加快上述引发反应速率,但不影响反应级数。更多还原

【Abstract】 A diadduct formed by the reaction of m-diisopropenylbenzene ( DIB ) with two mole equivalents of n-butyllithium (n-BuLi) at 20-50℃ for more than 20 hours was used as a difunctional anionic initiator soluble in nonpolar solvents. The effectiveness of the diadduct as dianionic initiator was studied by means of UV, GPC, VPO and end-group analysis. Also the kinetics polystyryllithium initiating butadiene or polybutadienyllithium initiating styrene were studied by using UV spectrophotometer. The results showed that all the four reactions were psuedo-first-order reactions with respect to the monomers; the apparent initiation rate in regard to styrene was larger than that to butadiene; the presence of a small amount of 1,2-dimethoxy ethane could speed up the above initiation reactions, but had no influence on the order of the reactions.更多还原