Strong influences of polymerization temperature on ethylene/1-hexene copolymerization catalyzed by （2-PhInd）ZrCl/methyl aluminoxane

被引：0

作者：

叶坚定

范志强

王伟

机构：

[1] Institute of Polymer Science

[2] Zhejiang University

[3] Hangzhou

[4] China

来源：

Journal of Zhejiang University Science | 2005年 / 10期

关键词：

Unbridged metallocene; Ethylene; 1-Hexene; Copolymerization; Temperature effect;

D O I：

暂无

中图分类号：

O631 [高分子物理和高分子物理化学];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Ethylene/1-hexene was copolymerized by an unbridged zirconocene, (2-PhInd)2ZrCl2/MAO (methyl aluminoxane) at 0 °C and 50 °C respectively. High copolymerization activity and 1-hexene incorporation were observed at 0 °C, with the co- polymer formed having random sequence distribution and narrow molecular weight distribution. Ethylene polymerization at 50 °C showed high activity, but copolymerization at 50 °C showed much lower activity, which decreased sharply with increasing 1-hexene concentration in the monomer feed. Copolymer formed at 50 °C showed blocky sequence distribution and broad mo- lecular weight distribution. A mechanism model based on ligand rotation hindered by the propagation chain has been proposed to qualitatively explain the observed phenomena.

引用

页码：1009 / 1014

页数：6