A kinetic study on ethylene polymerization by Cp2ZrCl2/iso-butylalumoxane

被引：0

作者：

Fan, ZQ ^{[1
]}

Weng, JH ^{[1
]}

Wang, Q ^{[1
]}

Feng, LX ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Polymer Sci & Engn, Hangzhou 310027, Peoples R China

来源：

CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE | 1998年 / 19卷 / 07期

关键词：

metallocene; iso-butylalumoxane; ethylene; polymerization;

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

iso-Butylalumoxane (BAO) has been synthesized and characterized, and ethylene polymerization catalyzed by Cp2ZrCl2/BAO has been investigated. The polymerization rate curves at different catalyst concentrations, Al/Zr molar ratio and polymerization temperature are determined and compared to the kinetic behavior of ethylene polymerization catalyzed by Cp2ZrCl2/methylalumoxane (MAO) reported in literature. On the basis a tentative model for the cocatalytic action of BAO has been proposed: only a kind of multi-molecular aggregates of BAO can act as cocatalyst of metallocenes. Because of the low stability of the BAO aggregates, Cp2ZrCl2/BAO system shows a moderate catalytic activity only at relatively high BAO concentration and medium temperature. The main reason for the lower activity of BAQ than MAO is the absence of highly active species which is stable at low concentration and high temperature.

引用

页码：1178 / 1180

页数：3

共 6 条

[1] CHEN SS, 1986, HDB SYNTHESIS ORGANO, P189
[2] METALLOCENE METHYLALUMINOXANE CATALYSTS FOR OLEFIN POLYMERIZATION .1. TRIMETHYLALUMINUM AS COACTIVATOR
CHIEN, JCW
WANG, BP
[J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1988, 26 (11) : 3089 - 3102
[3] FUJITA T, 1992, Patent No. 498675
[4] HOMOGENEOUS METALLOCENE-METHYLALUMINOXANE CATALYST SYSTEMS FOR ETHYLENE POLYMERIZATION
REDDY, SS
SIVARAM, S
[J]. PROGRESS IN POLYMER SCIENCE, 1995, 20 (02) : 309 - 367
[5] VELAESTRADA JM, 1994, POLYMER, V35, P808
[6] Xu JT, 1997, CHEM J CHINESE U, V18, P1734

← 1 →