THE INFLUENCE OF SUBSTITUENTS IN METALLOCENE ON PROPYLENE POLYMERIZATION*

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THE INFLUENCE OF SUBSTITUENTS IN METALLOCENE ON PROPYLENE POLYMERIZATION*

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- THE INFLUENCE OF SUBSTITUENTS IN METALLOCENE ON PROPYLENE POLYMERIZATION*
- Vol. 17, Issue 5, Pages: 476-481(1999)
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- Published：20 October 1999
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THE INFLUENCE OF SUBSTITUENTS IN METALLOCENE ON PROPYLENE POLYMERIZATION*[J]. 1999, 17(5): 476-481.
DOI：

THE INFLUENCE OF SUBSTITUENTS IN METALLOCENE ON PROPYLENE POLYMERIZATION*[J]. 1999, 17(5): 476-481. DOI：

摘要

Two new unbridged zirconocenes

bis(2

7-trimethyl indenyl)zirconium dichloride (Met-Ⅰ) andbis(2-methyl-4

7-diethyl indenyl)zirconium dichloride (Met-Ⅱ) were prepared in order to investigate thesteric effects of substituents on the nature of the catalysts for the polymerization of propylene. A mixture ofmethyl aluminoxane (MAO) and triisobutylaluminum [Al(iBu)3] was used as cocatalyst to activate thesecatalysts. The decrease in steric bulkiness of substituents at 4 and 7 positions of the indenyl ring resulted in an increase of both activity and molecular weight as well as the isotacticity.

Abstract

Two new unbridged zirconocenes

bis(2

7-trimethyl indenyl)zirconium dichloride (Met-Ⅰ) andbis(2-methyl-4

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