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

80 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

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Keywords

  • Cooperative effects
  • Copolymerization
  • Homogeneous catalysis
  • Zirconium

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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