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Ethylene polymerizations with disiloxane-bridged indenyl and cyclopentadienyl metallocene catalysts

✍ Scribed by Baiquan Wang; Liming Su; Shansheng Xu; Ru Feng; Xiuzhoug Zhou; Dawei He

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 420 KB
Volume: 198
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.1997.021981017

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

ansa‐Tetramethyldisiloxane‐bridged indenyl, tetrahydroindenyl and cyclopentadienyl zirconium complexes 1–4 were prepared. The pure rac‐1–3 and meso‐1–2 complexes were separated by fractional crystallization. Indenyl complexes, both rac‐1 and meso‐1, in the presence of methylaluminoxane (MAO), have very high activities for ethylene polymerization. The molecular weight of polyethylene produced with rac‐1 is extremely high and significantly dependent on polymerization temperature. The tert‐butyl‐substituted cyclopentadienyl complex exhibits low activity and produces polyethylene of low molecular weight.

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