Synthesis, Characterization, and Heterobimetallic Cooperation in a Titanium-Chromium Catalyst for Highly Branched Polyethylenes

被引：96

作者：

Liu, Shaofeng ^{[1
]}

Motta, Alessandro ^{[1
,2
,3
]}

Delferro, Massimiliano ^{[1
]}

Marks, Tobin J. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

[2] Univ Catania, Dipartimento Sci Chim, I-95125 Catania, Italy

[3] UdR Catania, INSTM, I-95125 Catania, Italy

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2013年 / 135卷 / 24期

基金：

美国国家科学基金会;

关键词：

METAL OXIDATION-STATE; OLEFIN POLYMERIZATION; ETHYLENE TRIMERIZATION; ETHENE TRIMERIZATION; BINUCLEAR CATALYSTS; REACTION-KINETICS; COMPLEXES; OLIGOMERIZATION; COCATALYSTS; ENCHAINMENT;

D O I：

10.1021/ja4039505

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A heterobimetallic catalyst, {Ti-Cr}, consisting of a constrained-geometry titanium olefin polymerization center (CGC(Eb)Ti) covalently linked to a chromium bis(thioether)amine ethylene trimerization center (SNSCr) was synthesized and fully characterized. In ethylene homopolymerizations it affords linear low-density polyethylene with molecular weights as high as 460 kg.mol(-1) and exclusively n-butyl branches in conversion-insensitive densities of similar to 18 branches/1000 carbon atoms, which are similar to 17 and similar to 3 times (conversion-dependent), respectively, those achieved by tandem mononuclear CGC(Et)Ti and SNSCr catalysts under identical reaction conditions.

引用

页码：8830 / 8833

页数：4

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