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C 1 ‐symmetric metallocenes for olefin polymerisation, 1. Catalytic performance of [Me 2 C(3‐ tert BuCp)(Flu)]ZrCl 2 in ethene/norbornene copolymerisation
Author(s) -
Arndt Michael,
Beulich Inken
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980601)199:6<1221::aid-macp1221>3.0.co;2-2
Subject(s) - norbornene , methylaluminoxane , metallocene , polymer chemistry , monomer , catalysis , polymerization , copolymer , migratory insertion , chemistry , post metallocene catalyst , organic chemistry , polymer
The mechanism of the alternating ethene/norbornene copolymerisation using [Me 2 C(3‐ tert BuCp)(Flu)]ZrCl 2 with methylaluminoxane as catalyst is investigated. Copolymerisation models to describe the copolymerisation behavior in the presence of metallocenes with heterotopic sites for monomer coordination are given and applied. It is shown that the microstructure of the copolymers produced at 30°C is the result of a chain migratory insertion mechanism (alternating mechanism) and the sterical hindrance for norbornene insertion at one of the two heterotopic sites of the metallocene. Further investigations on the influence of the reaction parameters showed that an increase in temperature (to 60°C) causes deviations from the alternating mechanism.