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
Publication statusPublished - 1999 Jun
Externally publishedYes

Fingerprint

dichlorides
Cyclization
Zirconium
polymerization
selectivity
Polymerization
monomers
Monomers
Nuclear magnetic resonance
nuclear magnetic resonance
microstructure
Microstructure
Cycloaddition
cycloaddition
Spectroscopy
Polarization
catalysts
Temperature
Catalysts
temperature

ASJC Scopus subject areas

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

Cite this

Cyclopolymerization of 1,7-octadiene with metallocene/ methylaluminoxane. / Naga, Naofumi; Shiono, Takeshi; Ikeda, Tomiki.

In: Macromolecular Chemistry and Physics, Vol. 200, No. 6, 06.1999, p. 1466-1472.

Research output: Contribution to journalArticle

Naga, Naofumi ; Shiono, Takeshi ; Ikeda, Tomiki. / Cyclopolymerization of 1,7-octadiene with metallocene/ methylaluminoxane. In: Macromolecular Chemistry and Physics. 1999 ; Vol. 200, No. 6. pp. 1466-1472.
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