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Synthesis of Silica‐Supported Metallocene Catalysts for Olefin Polymerization
Author(s) -
Bortolussi Frédéric,
Broyer JeanPierre,
Spitz Roger,
Boisson Christophe
Publication year - 2003
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/macp.200290032
Subject(s) - metallocene , polymer chemistry , ethylene , dispersity , polyethylene , copolymer , polymerization , catalysis , olefin fiber , polymer , ligand (biochemistry) , materials science , post metallocene catalyst , coordination polymerization , chemistry , organic chemistry , solution polymerization , biochemistry , receptor
Four supported metallocene catalysts were synthesized directly on silica [Si(CpZrCp), Si(CpZrInd), Si(IndZrCp), and Si(IndZrInd)]. The first ligand was chemically tethered to silica (internal ligand) while the second was free from silica (external ligand). The polymerization of ethylene and the copolymerization of ethylene with hexene were investigated. The activity of the catalysts and the molecular weights of the polymers were found to depend on the position of the ligands. In all cases, high‐molecular‐weight polyethylene with moderate polydispersity was obtained. Moreover, the copolymerization of ethylene with hexene provided a homogeneous polymer.Reaction of ZrCl 4 (OC 4 H 8 ) 2 with modified silica (SiCp).