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Copolymerization of ethylene with 1‐hexene or 1‐hexadecene over siloxy‐substituted metallocene catalysts
Author(s) -
Härkki Outi,
Lehmus Petri,
Leino Reko,
Luttikhedde Hendrik J. G.,
Näsman Jan H.,
Seppälä Jukka V.
Publication year - 1999
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(19990601)200:6<1561::aid-macp1561>3.0.co;2-a
Subject(s) - comonomer , copolymer , metallocene , methylaluminoxane , ethylene , polymer chemistry , 1 hexene , hexene , substituent , post metallocene catalyst , chemistry , catalysis , polymerization , polyethylene , organic chemistry , polymer
A series of ethylene copolymerizations with 1‐hexene or 1‐hexadecene over four different siloxy‐substituted ansa ‐metallocene/methylaluminoxane (MAO) catalyst systems was studied. High copolymerization activities and comonomer responses were observed in all cases and high molecular weight ethylene copolymers were obtained. Unsaturations resulting from vinyl and vinylidene double bonds were observed in the produced copolymers. It can be concluded that the position of the siloxy substituent has a large influence on polymerization activity and that the replacement of the tert ‐butyldimethylsiloxy groups with triisopropylsiloxy groups increases copolymerization ability of the catalysts.