Synthesis and characterisation of permethylindenyl zirconium complexes and their use in ethylene polymerisation

被引：32

作者：

Buffet, Jean-Charles ^{[1
]}

Arnold, Thomas A. Q. ^{[1
]}

Turner, Zoe R. ^{[1
]}

Angpanitcharoen, Phakpoom ^{[1
]}

O'Hare, Dermot ^{[1
]}

机构：

[1] Univ Oxford, Dept Chem, Chem Res Lab, Oxford OX1 3TA, England

来源：

RSC ADVANCES | 2015年 / 5卷 / 106期

关键词：

LAYERED DOUBLE HYDROXIDES; X-RAY-DIFFRACTION; OLEFIN POLYMERIZATION; METALLOCENE CATALYSTS; CRYSTAL-STRUCTURES; SILICA; DENSITY; BEHAVIOR; TRIMETHYLALUMINUM; COPOLYMERIZATION;

D O I：

10.1039/c5ra20465h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the synthesis of two zirconocenes, dimethylsilylbis(hexamethylindenyl) zirconium dichloride, rac-(SBI*)ZrCl2, and (n)butyldimethylsilyl(hexamethylindenyl) zirconium trichloride, [(Ind*(SiMe2Bu)-Bu-n)Zr(mu-Cl) Cl-2](2). The complexes were characterised by NMR spectroscopy and X-ray crystallography, and the bonding was evaluated using density functional theory. rac-(SBI*)ZrCl2 demonstrated a very high activity for solution phase polymerisation of ethylene (ca. 22 500 kg(PE)(-1) mol(Zr)(-1) h(-1) bar(-1)). Both rac-(SBI*)ZrCl2 and rac-(EBI*)ZrCl2 (EBI* = ethylenebis(hexamethylindenyl)) have been supported on MAO modified silica and AMOST layered double hydroxides (AMO-LDHs), and evaluated as catalysts in the slurry-phase polymerisation of ethylene. The highest catalytic polymerisation activities for rac-(SBI*)ZrCl2 and rac(EBI*) ZrCl2 on the layered double hydroxides were 9657 and 4325 kg(PE)(-1) mol(Zr)(-1) h(-1) bar(-1) respectively, for MAO modified Mg2Al-SO4 LDH. However, rac-(EBI*)ZrCl2 was a three times more active catalyst than rac-(SBI*)ZrCl2 when supported on silica.

引用

页码：87456 / 87464

页数：9

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