Study of propylene polymerization using zirconocenes Ph 2CCpFluZrCl2 and rac-Me2Si(2-Me,4-PhInd) 2ZrCl2 activated by combined MAO/TIBA cocatalyst

被引：0

作者：

Faingol'd, Eugenii E. ^{[1
]}

Bravaya, Natalia M. ^{[1
]}

机构：

[1] Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region

来源：

Polimery/Polymers | 2008年 / 53卷 / 05期

关键词：

Catalyst activity; Metallocene catalyst; Methylalumoxane; Propylene polymerization; Triisobutylaluminum;

D O I：

10.14314/polimery.2008.358

中图分类号：

学科分类号：

摘要：

Zirconocenes Ph2CCpFluZrCl2 (1) and rac-Me 2Si(2-Me,4-PhInd)2ZrCl2 (2) first preacti-vated with methylalumoxane (MAO) at rather low AlMAO/Zr molar ratio = 20 - 300 mol/mol and further activated either traditionally with MAO or non-traditionally with triisobutylaluminum (TIBA) have been studied and compared from the point of view of catalysts' activity in propylene polymerizations. The dependence of catalyst productivity on molar ratio of components has been analyzed. It has been shown by 1H NMR that mainly tetraisobutyl alumoxane (TIBAO) was formed at about equimolar MAO/TIBA ratios thus assuming TIBAO participation in initiation of the catalysts in examined systems. It has been shown that TIBAO provides higher catalytic activity compared to MAO at lower cocatalyst (activator)/catalyst molar ratios and allows conducting of propylene polymerization in the medium of heptane.

引用

页码：358 / 363

页数：5