Copolymerization of ethylene and cyclopentene with zirconocene catalysts: Effect of ligand structure of zirconocenes

Naofumi Naga, Yukio Imanishi

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Copolymerization of ethylene and cyclopentene (CPE) was carried out with various non-bridge and bridged zirconocene catalysts using methylaluminoxane as a cocatalyst. Non-bridged metallocene catalysts effected ethylene homopolymerization without copolymerization. On the other hand, bridged zirconocene catalysts produced copolymers containing cis-1,2-cyclopentane units. Among the used catalysts, rac-ethylenebis(indenyl)zirconium dichloride [Et(Ind)2ZrCl2] gave copolymers containing the highest amount of CPE units by 1,2-insertion of 1,3-insertion. Temperature-rising elution fractionation of the copolymers using 1,2-dichlorobenzene as a solvent showed a broad distribution of copolymer composition in copolymers obtained by specific zirconocene catalysts.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume203
Issue number1
DOIs
Publication statusPublished - 2002 Jan 9
Externally publishedYes

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Keywords

  • Copolymerization
  • Cyclopentene
  • Effect of ligand
  • Ethylene
  • Zirconocene catalyst

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Organic Chemistry
  • Physical and Theoretical Chemistry

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