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Issue 106, 2015
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Synthesis and characterisation of permethylindenyl zirconium complexes and their use in ethylene polymerisation

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Abstract

We report the synthesis of two zirconocenes, dimethylsilylbis(hexamethylindenyl) zirconium dichloride, rac-(SBI*)ZrCl2, and nbutyldimethylsilyl(hexamethylindenyl) zirconium trichloride, [(Ind*SiMe2nBu)Zr(μ-Cl)Cl2]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 kgPE−1 molZr−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 kgPE−1 molZr−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.

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

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The article was received on 03 Oct 2015, accepted on 07 Oct 2015 and first published on 08 Oct 2015


Article type: Paper
DOI: 10.1039/C5RA20465H
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RSC Adv., 2015,5, 87456-87464

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

    J. Buffet, T. A. Q. Arnold, Z. R. Turner, P. Angpanitcharoen and D. O'Hare, RSC Adv., 2015, 5, 87456
    DOI: 10.1039/C5RA20465H

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