Free radical polymerization kinetics of vinylsulfonic acid and highly acidic properties of its polymer

Teruyuki Okayasu, Toshiyasu Hibino, Hiroyuki Nishide*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Poly(vinylsulfonic acid) (PVS) possesses a high acid content (ion-exchange capacity in the chemical formula = 9.2 meq · g-1). Its monomer, vinylsulfonic acid (VSA), had a high acid dissociation ability (Hammett acid function = 0.74 in water), and a high ionic conductivity (0.04-0.11 S · cm-1). The radical polymerization of VSA with various initiators was kinetically investigated. The ESR spectrum of the VSA polymerization mixture showed a strong signal ascribed to the propagation carbon radical of VSA. The molecular weight of PVS increased with the increasing monomer concentration and decreasing radical initiator concentration to yield the PVS with a molecular weight of 4.0 × 104. Proton-conductivity of PVS under hydrated and nonhumidified conditions was on the order of 10-1 and 10-3-10-6 S · cm-1, respectively. Poly(vinylsulfonic acid) (PVS) has a high acid density (IEC=9.2 meq·g-1) and is the solid-state organic analog of sulfuric acid. Radical polymerization of the acid form of vinylsulfonic acid is kinetically investigated. PVS with a high molecular weight is obtained as a transparent membrane and shows a high proton-conductivity under both hydrated and nonhumidified conditions.

Original languageEnglish
Pages (from-to)1072-1079
Number of pages8
JournalMacromolecular Chemistry and Physics
Issue number10
Publication statusPublished - 2011 May 17


  • kinetics
  • proton-conductivity
  • radical polymerization
  • sulfonic acid polymer
  • vinyl compound

ASJC Scopus subject areas

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


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