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Sterically demanding bis(2‐silylindenyl)zirconium(IV) dichlorides as polymerisation catalyst precursors
Author(s) -
Hannisdal Andreas,
Möller Andreas C.,
Rytter Erling,
Blom Richard
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450909
Subject(s) - comonomer , steric effects , zirconium , catalysis , hydride , polymerization , chemistry , monomer , mole fraction , polymer chemistry , medicinal chemistry , inorganic chemistry , organic chemistry , hydrogen , ethylene , polymer
A set of different 1‐ and 2‐silyl‐substituted zirconocene dichloride/MAO catalyst systems was investigated with respect to their performance in ethene/1‐hexene copolymerisations. In‐depth studies of bis(2‐dimethylsilylindenyl) zirconium(IV) dichloride ( 1 ) revealed a multi‐site behaviour, illustrating sensitivity to the reaction temperature and the comonomer mole fraction. Surprisingly, an upper limit is observed for the latter, leading to complete catalyst inhibition. Analysis of the chain termination processes implies the possibility of a predominant, although in general less favourable, β ‐hydride elimination route under certain polymerisation conditions.