Kinetics and mechanistic insight into propylene polymerization with different metallocenes and various aluminium alkyls as cocatalysts

被引：64

作者：

Kleinschmidt, R ^{[1
]}

van der Leek, Y ^{[1
]}

Reffke, M ^{[1
]}

Fink, G ^{[1
]}

机构：

[1] Max Planck Inst Kohlenforsch, D-45470 Mulheim, Germany

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 1999年 / 148卷 / 1-2期

关键词：

metallocene; MAO; aluminium alkyls; propylene polymerization; molecular weight; polymerization rate; Al]/[Zr]-ratio;

D O I：

10.1016/S1381-1169(99)00055-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of successive replacement of MAO by different aluminium alkyls in a metallocene catalyzed homogeneous polymerization is discussed. An activating effect was found by the addition of TIBA and TEA, whereas TMA and TEA have a deactivating effect. Propylene polymerizations were carried out with different substituted metallocenes of the general formula Me2C[3-RCpFlu]ZrCl2, where R is H, methyl, i-propyl or t-butyl. With increasing the size of the substituent, the polymerization activity decreased. Besides, it was found that the deactivating effect of methylaluminoxane (MAO) during the polymerization was compensated with more bulky substituents. Using Me2C[3-t-BuCpFlu]ZrCl2 for the propylene polymerization, a deactivating effect was no longer observed. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：29 / 41

页数：13

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