Cyclopolymerization of 1,7-octadiene with metallocene/ methylaluminoxane

Naofumi Naga, Takeshi Shiono, Tomiki Ikeda

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Polymerization of 1,7-octadiene was conducted with isospecific rac-dimethylsilylenebis(indenyl)zirconium dichloride (1), syndiospecific diphenylmethylene(cyclopentadienyl)(9-fluorenyl)zirconium dichloride (2) and aspecific bis(cyclopentadienyl)zirconium dichloride (3) metallocene catalysts combined with methylaluminoxane. The microstructure of the poly(1,7-octadiene)s produced was characterized by means of 1H NMR, 13C NMR and DEPT (distortionless enhancement by polarization transfer) spectroscopy. A portion of monomeric units in poly(1,7-octadiene)s is saturated as a result of cycloaddition. The fraction of the saturated units (cyclization selectivity) decreases in the following order: 1 > 3 > 2. The effect of polymerization temperature was studied, and the cyclization selectivity was found to decrease with lowering the polymerization temperature. The monomer concentration affects the microstructure of poly (1,7-octadiene), and the cyclization selectivity is drastically decreased with increasing monomer concentration.

Original languageEnglish
Pages (from-to)1466-1472
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume200
Issue number6
DOIs
Publication statusPublished - 1999 Jun

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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