Dynamics of sulfonated polystyrene ionomers using broadband dielectric spectroscopy

Pornpen Atorngitjawat, James Runt

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

The dynamics of sulfonated polystyrene ionomers were investigated by using broadband dielectric relaxation spectroscopy. Dynamic mechanical analysis, Fourier transform infrared spectroscopy, differential scanning calorimetry, and small-angle X-ray scattering were employed in a complementary role. Sulfonated polystyrene ionomers were prepared from the precursor sulfonic acid polystyrene, having 1 and 7 mol % sulfonic acid, by exchanging the protons of the acid functionality with Na, Cs, and Zn cations. Three dielectric relaxations were observed above the glass transition temperature: the segmental α process and relaxations associated with Maxwell-Wagner-Sillars interfacial polarization and electrode polarization. The low-frequency broadening of the a transition is related to constraints imposed by the ionic aggregates. A relaxation in the glassy state was observed for the precursor sulfonic acid polystyrene and ionomers and attributed to the local motion of sulfonated phenyl groups. The relaxation strengths of the β processes of the ionomers were suppressed by interaction with the cations that create physical cross-links, and the relaxation times decreased with increasing strength of the electrostatic interaction of the ion pairs.

Original languageEnglish (US)
Pages (from-to)991-996
Number of pages6
JournalMacromolecules
Volume40
Issue number4
DOIs
StatePublished - Feb 20 2007

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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