The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether

Toyoki Kunitake, Kunihide Takarabe, Shun Ichi Tsugawa

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The cationic polymerization of isobutyl vinyl ether was conducted with a variety of triphenylmethyl salts as initiators, and the steric structure of the polymer was determined from the methylene dyad peaks in the13C-NMR spectra. The fraction of the isotactic dyad increased with the increase in the counteranion size from BF4-to CIO4 to BC14, and then decreased: A trend similar to that observed for ɑ-methylstyrene. The correlation seems to be more complex for larger counteranions, and a periodical influence was clearly noticed. These results were explained by considering the tightness of the propagating ion-pair. Pentacoordinate counteranions showed peculiar influences in that the polymer structure was influenced by the counteranion concentration. The molecular weight distribution was unimodal, suggesting that a single propagating species is present.

Original languageEnglish
Pages (from-to)363-368
Number of pages6
JournalPolymer Journal
Volume8
Issue number4
DOIs
Publication statusPublished - Jan 1 1976

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Cationic polymerization
Ethers
Polymers
Molecular weight distribution
Salts
Nuclear magnetic resonance
Ions
vinyl ether
vinyltoluene

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry

Cite this

The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether. / Kunitake, Toyoki; Takarabe, Kunihide; Tsugawa, Shun Ichi.

In: Polymer Journal, Vol. 8, No. 4, 01.01.1976, p. 363-368.

Research output: Contribution to journalArticle

Kunitake, Toyoki ; Takarabe, Kunihide ; Tsugawa, Shun Ichi. / The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether. In: Polymer Journal. 1976 ; Vol. 8, No. 4. pp. 363-368.
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