A kind of novel nonmetallocene catalysts for ethylene polymerization

被引：13

作者：

Ma, Lifu ^{[1
]}

Sheng, Yaping ^{[1
]}

Huang, Qigu ^{[1
]}

Zhao, Yangfeng ^{[1
]}

Deng, Kunxue ^{[1
]}

Ll, Junlong ^{[1
]}

Yang, Wantai ^{[1
]}

机构：

[1] Beijing Univ Chem Technol, Coll Mat Sci & Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 2008年 / 46卷 / 01期

关键词：

broad weight distribution; metallocene catalysts; methylaluminoxane; nonmetallocene; polyethylene; structure;

D O I：

10.1002/pola.22354

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A kind of novel bridged nonmetallocene catalysts was synthesized by the treatment of NN-imidazole and NN-phenylimidazole with n-BuLi, and MCl4 (M = Ti, Zr) in THF. Those catalysts were performed for ethylene polymerization after activated by methylaluminoxane (MAO). The effects of polymerization temperature, Al/M ratio, pressure of monomer, and concentration of catalysts on ethylene polymerization behaviors were investigated in detail. Those results revealed that the catalyst system was favorable for ethylene polymerization with high catalytic activity. The polymer was characterized by C-13 NMR, WAXD, GPC, and DSC. The result confirmed that the obtained polyethylene featured broad molecular weight distribution around 20, linear structure, and relative low melting temperature. (c) 2007 Wiley Periodicals, Inc.

引用

页码：33 / 37

页数：5

共 19 条

[1] NEW EARLY TRANSITION-METAL PORPHYRINS - A NEW ROUTE TO DIORGANO COMPLEXES OF ZIRCONIUM AND HAFNIUM AND THE PREPARATION OF CATIONIC DERIVATIVES [J].