| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9614645 | Journal of Molecular Catalysis A: Chemical | 2005 | 10 Pages |
Abstract
The catalytic behavior of Cr(II) and Cr(IV) catalyst precursors for the polymerization of ethylene and norbornene are compared. Cr(allyl)2/MAO catalysts polymerize norbornene but not ethylene, whereas Cr(II) undergoes one-electron transfer with B(C6F5)3 to generate [CrIII(allyl)2]+ which readily polymerizes ethylene. By contrast, the Cr(IV) complex Cr(CH2SiMe3)4/MAO oligomerizes norbornene but is highly active for ethylene/norbornene copolymerizations to high molecular weight copolymers with up to 60Â mol% norbornene content. Significantly, activity increases with norbornene concentration.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Timothy J. Woodman, Yann Sarazin, Shaun Garratt, Gerhard Fink, Manfred Bochmann,