Weight watching: In ethylene polymerization, approximately 70 fold increases in molecular weight are achieved with C1-Zr2 compared to ethylene-bridged C2-Zr2 (see scheme). With MAO as the cocatalyst, approximately 600 fold increases in polyethylene (PE) molecular weight are achieved with C2-Zr2Cl4 and C1-Zr2Cl 4 compared to a mononuclear analogue. These results support the argument that Zr-Zr proximity significantly influences chain-transfer rates, and such effects are highly cocatalyst-sensitive.
|Original language||English (US)|
|Number of pages||4|
|Journal||Angewandte Chemie - International Edition|
|State||Published - Sep 20 2004|
- Cooperative effects
- Homogeneous catalysis
ASJC Scopus subject areas