Novel zirconocene hydride complexes in homogeneous and in SiO2-supported olefin-polymerization catalysts modified with diisobutylalundnum hydride or triisobutylaluminum

被引：33

作者：

Babushkin, Dmitrii E. ^{[2
]}

Panchenko, Valentina N. ^{[2
]}

Timofeeva, Maria N. ^{[2
]}

Zakharov, Vladimir A. ^{[2
]}

Brintzinger, Hans H. ^{[1
]}

机构：

[1] Univ Konstanz, Fachbereich Chem, D-78457 Constance, Germany

[2] Russian Acad Sci, Boreskov Inst Catalysis, RU-630090 Novosibirsk, Russia

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2008年 / 209卷 / 12期

关键词：

MAO activation; metallocene catalysts; olefin polymerization; polyolefins; SiO2; support;

D O I：

10.1002/macp.200800084

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Reactive species in SiO2-supported, zirconocene-based olefin-polymerization catalysts have been characterized by comparison of their UV-vis spectra with those of related, NMR-spectroscopically identified catalyst species in homogeneous solution. Neutral zirconocene dihydride complexes are found to arise in hydrocarbon solutions as well as on SiO2 supports when catalyst systems that contain rac-Me2Si(ind)(2)ZrCl2 and methylaluminoxane (MAO) are modified by addition of diisobutylaluminum hydride or triisobutylaluminum. These complexes, tentatively formulated as adducts with Lewis-acidic alkylaluminum species AlR2X, rac-Me2Si(ind)(2)ZrH2 center dot {nAlR(2)X}, are reconverted into the initial reactive zirconocene cations upon addition of isobutene to these reaction systems.

引用

页码：1210 / 1219

页数：10

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