A biphenylene-bridged dinuclear constrained geometry titanium complex for ethylene and ethylene/1-octene polymerizations
作者:Min Hyung Lee、Myung Hwan Park、Woo Young Sung、Seong Kyun Kim、AuJiRu Son、Youngkyu Do
DOI:10.1016/j.jorganchem.2011.10.010
日期:2012.1
increased molecular weight of polymer (>two-fold), as well as high level of activity and 1-octene incorporations in ethylene and ethylene/1-octene polymerizations. Although the lower activity was observed at high 1-octene feeds, the combined effects of rigidity and electronic conjugation induced by the biphenylene bridge might be responsible for the observed polymerization properties of BPTi2.
全甲基环戊二烯基双核几何受限的钛催化剂,[μ-(C 6 H ^ 4)2 -2,2'] (η 5 -C 5我3)[1-ME 2的Si(η 1 -N-吨丁基)]合成并通过联苯桥连接的(TiCl 2)} 2(BPTi 2)并通过TIBA(三异丁基铝)/ [Ph 3 C] [B(C 6 F 5)4活化)在乙烯和乙烯/ 1-辛烯聚合中进行测试。]。与相应的高活性单核类似物Me 2进行比较的Si(η 5 -2-光子晶体5我3)(η 1 -N-吨卜)的TiCl 2(PhTi 1)和Me 2的Si(η 5 -C 5我4)(η 1 -N-吨丁基)的TiCl 2(MeTi 1),BPTi 2在乙烯和乙烯/ 1-辛烯聚合中,聚合物的分子量显着增加(> 2倍),并且具有较高的活性水平和1-辛烯的结合。尽管在高1-辛烯进料中观察到较低的活性,但是由联苯桥引起的刚性和电子共轭的综合作用可能是所观察到的BPTi 2聚合性能的原因。