SILICA-SUPPORTED METALLOCENES - STEREOCHEMICAL COMPARISON BETWEEN HOMOGENEOUS AND HETEROGENEOUS CATALYSIS

被引：124

作者：

SACCHI, MC ^{[1
]}

ZUCCHI, D ^{[1
]}

TRITTO, I ^{[1
]}

LOCATELLI, P ^{[1
]}

DALLOCCO, T ^{[1
]}

机构：

[1] HIMONT ITALIA SRL,CTR RIC GIULIO NATTA,I-44100 FERRARA,ITALY

来源：

MACROMOLECULAR RAPID COMMUNICATIONS | 1995年 / 16卷 / 08期

关键词：

D O I：

10.1002/marc.1995.030160807

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Propylene was polymerized in the presence of the isospecific Et(Ind)(2)ZrCl2 (Et: ethylene, Ind: indenyl) and the aspecific (Ind)(2)ZrCl2 complexes in solution and anchored to SiO2 and SiO2/MAO (MAO: methylaluminoxane) supports. From the stereochemical analysis of the polypropene samples obtained it can be deduced that i) the same active species is formed when a metallocene is in solution and when it is anchored to the SiO2/MAO support and ii) a completely different active species is formed when the metallocene is anchored to the silica. The fact that both systems Et(Ind)(2)ZrCl2-SiO2 and (Ind)(2)ZrCl2-SiO2 produce the same prevailingly isospecific polymer suggests that only isospecific centers are formed in this case, independently of the metallocene stereochemical structure.

引用

页码：581 / 590

页数：10

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