【摘要】 研究了Ti(acac)2Cl2/AlEt2Cl催化丙烯腈聚合反应,分析了加入第三组分ZnCl2对聚合反应的影响,用13C-NMR对聚合产物进行了表征,并探讨了聚合反应机理。结果表明,随着聚合温度的提高和聚合反应时间的增加,单体转化率增大,聚丙烯腈的分子量提高。当体系中n(AN)/n(Cat)超过一定量时,则得不到高聚物。体系中加入ZnCl2能明显提高单体转化率和产物分子量,并且产物的三单元规整结构含量明显增加。更多还原

【Abstract】 The polymerization of acrylonitrile was achieved by a new catalyst of Ti（acac）₂Cl₂/AlEt₂Cl simultaneously with a polymerization kinetics study on polymerization time and polymerization temperature. The monomer conversion could be greatly improved when ZnCl₂ was added to the catalyst in amount of n（AlEt₂Cl）/n（ZnCl₂）=2. Moreover, the yielding PAN with Ti（acac）₂Cl₂/AlEt₂Cl-ZnCl₂ showed a higher triad regularity structrue than that made with Ti（acac）₂Cl₂/AlEt₂Cl. The different initiation-propagation mechanisms were proposed with （）¹³C-NMR confirmation.更多还原