STEREOCHEMICAL CONTROL IN PROPYLENE POLYMERIZATION CATALYZED BY UNBRIDGED METALLOCENE CATALYSTS*

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STEREOCHEMICAL CONTROL IN PROPYLENE POLYMERIZATION CATALYZED BY UNBRIDGED METALLOCENE CATALYSTS*

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- STEREOCHEMICAL CONTROL IN PROPYLENE POLYMERIZATION CATALYZED BY UNBRIDGED METALLOCENE CATALYSTS*
- Vol. 19, Issue 4, Pages: 407-413(2001)
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- Published：20 August 2001
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STEREOCHEMICAL CONTROL IN PROPYLENE POLYMERIZATION CATALYZED BY UNBRIDGED METALLOCENE CATALYSTS*[J]. 2001, 19(4): 407-413.
DOI：

STEREOCHEMICAL CONTROL IN PROPYLENE POLYMERIZATION CATALYZED BY UNBRIDGED METALLOCENE CATALYSTS*[J]. 2001, 19(4): 407-413. DOI：

摘要

Two unbridged metallocene catalysts

bis (2

7-trimethylindenyl)zirconium dichloride (met-I) and bis(2

6-trimethylindenyl) zirconium dichloride (met-II)

which are different in the position o f substituents on the six-membered ringof the indenyl ligands were synthesized. The effect of substituents in the two metallocenes on the propylene polymerizationwas studied in the presence of methylaluminoxane (MAO) and triisobutylaluminium (TIBA). From the analysis ofmicrostructure determined by 13C-NMR

it was demonstrated that the polymers produced by met-II have higher [mmmm] isotactic sequences than that of met-I.Using a mechanism based on model statistical analysis

it was found that chain-end model was dominant for met-I.However

met-II obeys the concurrent two-sites model during polymerization

which can be attributed to the existence of "racemic-like"conformer in its system.

Abstract

Two unbridged metallocene catalysts

bis (2

7-trimethylindenyl)zirconium dichloride (met-I) and bis(2

6-trimethylindenyl) zirconium dichloride (met-II)

it was demonstrated that the polymers produced by met-II have higher [mmmm] isotactic sequences than that of met-I.Using a mechanism based on model statistical analysis

it was found that chain-end model was dominant for met-I.However

met-II obeys the concurrent two-sites model during polymerization

which can be attributed to the existence of "racemic-like"conformer in its system.

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