Composition distribution of ethylene or propylene-norbornene copolymers obtained with zirconocene catalysts

Naofumi Naga, Yukio Imanishi

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Copolymerization of ethylene or propylene and norbornene (NB) was carried out with stereospecific zirconocene catalysts rac-ethylenebis(indenyl)zirconium dichloride, rac-dimethylsilylenebis(indenyl)zirconium dichloride (2), rac-dimethyl-silylenebis(2-methylindenyl)zirconium dichloride, and diphenylmethylene(cyclopentadienyl)(9-fluorenyl)zirconium dichloride combined with cocatalysts at 40°C. Temperature-rising elution fractional of the copolymers was carried out with cross-fractionation chromatography with o-dichlorobenzene as a solvent, and a broad distribution of the copolymer composition was detected. The fraction eluted at lower temperature contained higher NB. The effect of the polymerization time was examined in the ethylene-NB copolymerization with catalyst 2, and the higher-temperature elution fraction increased with increasing polymerization time.

Original languageEnglish
Pages (from-to)441-448
Number of pages8
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume41
Issue number3
DOIs
Publication statusPublished - 2003 Feb 1
Externally publishedYes

Keywords

  • Composition distribution
  • Copolymerization
  • Norbornene
  • Polyethylene
  • Polypropylene
  • Temperature-rising elution fractionation

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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