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- Title
Novel monocyclopentadienyl zirconium and hafnium trialkoxide complexes: Syntheses and catalytic properties for olefin polymerization.
- Authors
Ting‐Jui Hsiao; Jing‐Cherng Tsai
- Abstract
Monocyclopentadienyl trialkoxy compounds of zirconium and hafnium [CpZr(OR)3and CpHf(OR)3], which cannot be prepared by earlier methods, are synthesized in situby reacting bis(cyclopentadienyl) magnesium with zirconium tetraalkoxides [Zr(OR)4] and with hafnium tetraalkoxides [Hf(OR)4], respectively. The generation of CpZr(OR)3and CpHf(OR)3compounds involves a highly effective cyclopentadienyl ligand (Cp) transfer reaction from the Cp ligand of bis(cyclopentadienyl) magnesium to Group 4 metal alkoxides. The utilization of CpZr(OR)3and CpHf(OR)3compounds as catalyst precursors for mediating α‐olefin polymerizations was carefully investigated. Results show that highly active catalysts can be generated by reacting these mono‐Cp Zr and Hf alkoxides with methylaluminoxane. The resulting active CpZr(OR)3/MAO and CpHf (OR)3/MAO catalysts induce ethylene polymerization and ethylene/propylene copolymerization with high activity (e.g., 1820 kg PE/mole of catalyst‐h). © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
- Subjects
ZIRCONIUM; HAFNIUM; MAGNESIUM; LIGANDS (Chemistry); ALKOXIDES
- Publication
Journal of Applied Polymer Science, 2010, Vol 116, Issue 4, p2040
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.31731