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

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry

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