Ethylene polymerization by 3-oxa-pentamethylene bridged dinuclear metallocene (Ti, Zr)/MAO systems

被引：0

作者：

Lin, Feng ^{[1
]}

Sun, Junquan ^{[1
]}

Li, Xu ^{[1
]}

Lang, Wuke ^{[1
]}

Li, Hongfeng ^{[1
]}

Schumann, H. ^{[2
]}

机构：

[1] Department of Chemical Engineering, College of Material and Chemical Engineering, Zhejiang University, Hangzhou, 310027, China

[2] Technische Universität Berlin, Institut für Chemie, 10623 Berlin, Germany

来源：

European Polymer Journal | 2007年 / 43卷 / 04期

关键词：

Two hetero-atom containing bridged dinuclear metallocene complexes; (CpMCl2)2(C5H4CH2CH2OCH2CH2C5H4) [M = Ti (1); Zr; (2); have been synthesized by treating the disodium salt of the corresponding ligand (C5H5CH2CH2)2O with two equivalents of CpTiCl3 and CpZrCl3 &middot DME; respectively; in THF at 0 °C and characterized by 1H- and 13C-NMR; MS and IR spectroscopy. Homogenous ethylene polymerization by those complexes has been conducted systematically in the presence of methylaluminoxane (MAO). The influences of reaction parameters; such as [MAO]/[Cat] molar ratio; catalyst concentration; ethylene pressure; temperature and time; have been studied in detail. The catalytic activities of the dinuclear complexes 1 and 2 were higher than those of (MeCpTiCl2)2(C5H4CH2C6H4CH2C5H4) (3); (CpZrCl2)2(C5H4CH2C6H4CH2C5H4) (4) and the mononuclear metallocenes Cp2TiCl2 and Cp2ZrCl2; respectively. Complex 2 showed high catalytic activity at high temperature (50-100 °C) and high pressure (6 bar). The molecular weight distributions of polyethylene produced by 1 and 2 (MWD = 2.49 and 5.90) were broader than those using the corresponding mononuclear metallocenes (MWD = 2.05 and 2.15). The melting points of the polyethylene produced ranged from 129 to 133 °C; indicating a high linearity and a high crystallinity. © 2007 Elsevier Ltd. All rights reserved;

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页码：1436 / 1443