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在具有高度等规定向能力的rac-Me2Si(2-Me-4-Ph-Ind)2ZrCl2/MAO催化体系所催化的丙烯聚合反应中,通过控制聚合条件,实现聚合物链选择性地向对双苯乙烯单体的链转移反应,合成出一种新的苯乙烯基封端的反应性等规聚丙烯.以这种苯乙烯基封端反应性聚丙烯为结构单元,构筑了两种拓扑结构(接枝和星型)的聚丙烯共聚物,一是在CpTiCl3/MAO催化下,与苯乙烯小分子进行配位聚合,合成了以间规聚苯乙烯为主链、等规聚丙烯为侧链的接枝共聚物(sPS-g-iPP);二是选择性地在链端苯乙烯基上进行氯化和取代反应,定量地将叠氮基团引入等规聚丙烯链端,再与多炔基偶合剂进行点击反应,合成了星型等规聚丙烯.
In the polymerization of propylene catalyzed by the rac-Me2Si (2-Me-4-Ph-Ind) 2ZrCl2 / MAO catalyst system with a high degree of regularity, by controlling the polymerization conditions, Styrene chain reaction of a monomer, a new styryl-terminated reactive isotactic polypropylene was synthesized.With this styrenyl-terminated reactive polypropylene as the structural unit, two topologies were constructed Grafting and star) polypropylene copolymer, one is CpTiCl3 / MAO catalysis, and styrene small molecule coordination polymerization, synthesis of syndiotactic polystyrene as the main chain, isotactic polypropylene as the side chain Of the graft copolymer (sPS-g-iPP); the second is selectively carried out in the chain-end of styryl chlorination and substitution reaction, quantitative azide groups into the isotactic polypropylene chain end, and then with more Alkynyl coupling agent click reaction, synthesis of star-shaped isotactic polypropylene.