Microstructure of metallocene-catalyzed propene/1-pentene copolymers

被引：20

作者：

Sacchi, MC

Forlini, F

Losio, S

Tritto, I

Wahner, UM

Tincul, I

Joubert, DJ

Sadiku, ER

机构：

[1] CNR, Ist Studio Macromol, I-20133 Milan, Italy

[2] Sasol Technol, ZA-1947 Sasolburg, South Africa

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2003年 / 204卷 / 13期

关键词：

copolymerization; metallocene; microstructure; NMR; polyolefins;

D O I：

10.1002/macp.200350024

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The microstructure of propen/1-pentene copolymers prepares with metallocene catalysts rac-Et(Ind)(2)ZrCl2 and rac-Me2Si((2)-MeBenz-[e]Ind)(2)ZrCl2 was studied by C-13 NMR spectroscopy. Both catalysts lead to the formation of random copolymers although rac-Me2Si(2-MeBenz-[e]Ind)(2)ZrCl2 favors a somewhat higher incorporateion of 1-pentene than rac-Et(Ind)(2)ZrCl2. Surprisingly, the presence of 1-pentene has a significant influence on the stereoregularity of the copolymers formed with rac-Me2Si(2-MeBenz-[e]Ind)(2)ZrCl2. Propene/1-pentene copolymers produced with rac-Et(Ind)(2)ZrCl2 retained the isotacticity of polypropene and featured only the stereoerror pentads mmmr, mmrr and mrrm typical for enantiomorphics site control. However, propene/1-pentene copolymers obtained with rac-Me2Si(2-MeBenz-[e]Ind)(2)ZrCl2 are characterized by a gradual loss of tacticity which is concurrent with an increace in the amount of all irregular pentads. It is proposed that the presence of 1-pentene can lead to a reversible loss of stereo-control over a whole sequence of inserted monomer units. Subsequently, more of less atactic blocks are formed besides isotactic blocks.

引用

页码：1643 / 1652

页数：10

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