Ethylene-bridged (4-Substituted Indenyl) (Fluorenyl) Zirconium Complexes: Synthesis and Catalytic Behavior for α-Olefins Polymerization

被引：1

作者：

Huang Wenzhong ^{[1
]}

Ma Haiyan ^{[1
]}

Huang Jiling ^{[1
]}

机构：

[1] E China Univ Sci & Technol, Lab Organometall Chem, Shanghai 200237, Peoples R China

来源：

CHINESE JOURNAL OF CATALYSIS | 2011年 / 32卷 / 04期

基金：

中国国家自然科学基金;

关键词：

ansa-metallocene; zirconium; polymerization; isotactic polypropylene; polyethylene; METALLOCENE CATALYSTS; ISOTACTIC POLYPROPYLENE; ZIRCONOCENES; PROPYLENE; MECHANISM; C-1;

D O I：

10.3724/SP.J.1088.2011.01239

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Three new ethylene-bridged (4-substituted indenyl) (fluorenyl) zirconium complexes (2a-2c) were successfully synthesized. They exhibited high isotactic selectivity, which increased with the decrease of polymerization temperature for the polymerization of propylene upon the activation of MAO (methylaluminoxane). Complex 2a with 2-methyl group on indenyl displayed the highest isotactic selectivity of 93.6 % at 0 degrees C. At 60 degrees C, complexes 2a-2c reached their optimum catalytic activity, and complex 2a displayed the highest activity of 7.80 x 106 g PP/(mol-Zr.h). Meanwhile, complexes 2a-2c were also studied for ethylene homopolymerization and linear polyethylenes with broad molecular weight distributions were obtained. Complex 2c with 4-isopropyl substituent on indenyl showed high activity of 3.45 x 10(6) g PE/(mol-Zr.h) even at a low Al/Zr molar ratio of 500.

引用

页码：657 / 665

页数：9

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