Abstract
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 |
|---|---|
| Pages (from-to) | 4937-4940 |
| Number of pages | 4 |
| Journal | Angewandte Chemie - International Edition |
| Volume | 43 |
| Issue number | 37 |
| DOIs | |
| Publication status | Published - Sep 20 2004 |
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Keywords
- Cooperative effects
- Copolymerization
- Homogeneous catalysis
- Zirconium
ASJC Scopus subject areas
- Chemistry(all)
Cite this
Polynuclear olefin polymerization catalysis : Proximity and cocatalyst effects lead to significantly increased polyethylene molecular weight and comonomer enchainment levels. / Li, Hongbo; Li, Liting; Marks, Tobin J.
In: Angewandte Chemie - International Edition, Vol. 43, No. 37, 20.09.2004, p. 4937-4940.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Polynuclear olefin polymerization catalysis
T2 - Proximity and cocatalyst effects lead to significantly increased polyethylene molecular weight and comonomer enchainment levels
AU - Li, Hongbo
AU - Li, Liting
AU - Marks, Tobin J
PY - 2004/9/20
Y1 - 2004/9/20
N2 - 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.
AB - 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.
KW - Cooperative effects
KW - Copolymerization
KW - Homogeneous catalysis
KW - Zirconium
UR - http://www.scopus.com/inward/record.url?scp=4744362714&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4744362714&partnerID=8YFLogxK
U2 - 10.1002/anie.200460288
DO - 10.1002/anie.200460288
M3 - Article
C2 - 15372564
AN - SCOPUS:4744362714
VL - 43
SP - 4937
EP - 4940
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
SN - 1433-7851
IS - 37
ER -