para-sec-phenethyl substituents with improved thermal stability and catalytic performance. C1-Et2AlCl exhibited high thermal stabilities and high activities reaching 4.61 × 106 g PE (mol Ni h)−1, producing highly branched amorphous polyethylenes (up to 143 branches/1000C) with high molecular weight and narrow polydispersity. This catalyst system conducted successfully conducted 2-octene polymerization in comparison
一系列带有不同对位取代基团的α-二
亚胺镍(II)催化剂,[(4-R-2,6-Me 2 -C 6 H 2 NC) 2 Nap]NiBr 2 , Nap: 1, 8-
萘二基;R = CHMePh ( C1 ); R = CHPh 2 ( C2 ); R = t Bu ( C3 ); R =
溴 ( C4 ); R = Me ( C5 )},被合成和表征。C1和C3的分子结构通过单晶 X 射线分析确定,并显示出具有C 2v的扭曲四面体几何形状对称。在作为助催化剂的
二乙基氯化铝 (Et 2 AlCl)存在下研究了这些催化剂对
乙烯聚合的催化行为。通过引入具有改善的热稳定性和催化性能的对仲苯乙基取代基,可以有效地调节N、N螯合
镍体系中的快速链行走过程。C1- Et 2 AlCl 表现出高热稳定性和高活性,达到 4.61 × 10 6 g PE (mol Ni h) -1,生产具有高分子量和窄多分散性的高支化无定形聚
乙烯(高达