Polynuclear olefin polymerization catalysis

Proximity and cocatalyst effects lead to significantly increased polyethylene molecular weight and comonomer enchainment levels

Hongbo Li, Liting Li, Tobin J Marks

Research output: Contribution to journalArticle

78 Citations (Scopus)

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 languageEnglish
Pages (from-to)4937-4940
Number of pages4
JournalAngewandte Chemie - International Edition
Volume43
Issue number37
DOIs
Publication statusPublished - Sep 20 2004

Fingerprint

Alkenes
Polyethylene
Catalysis
Olefins
Polyethylenes
Ethylene
Molecular weight
Polymerization
Monoamine Oxidase
ethylene

Keywords

  • Cooperative effects
  • Copolymerization
  • Homogeneous catalysis
  • Zirconium

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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title = "Polynuclear olefin polymerization catalysis: Proximity and cocatalyst effects lead to significantly increased polyethylene molecular weight and comonomer enchainment levels",
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.",
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T2 - Proximity and cocatalyst effects lead to significantly increased polyethylene molecular weight and comonomer enchainment levels

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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

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