Dynamics of sulfonated polystyrene copolymers using broadband dielectric spectroscopy

Pornpen Atorngitjawat, Robert J. Klein, James Runt

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

We examine the dynamics of acid and methylated precursors to sulfonated polystyrene ionomers. Dielectric relaxation spectroscopy was the primary tool used in the investigation of the dynamics, and dynamic mechanical analysis, Fourier transform infrared spectroscopy, and differential scanning calorimetry were employed in a complementary role. Monodisperse polystyrene was sulfonated to 1 and 7 mol % and the behavior compared to that of neat polystyrene and methyl-sulfonated polystyrene. Three relaxations were identified in dielectric spectra of the acid form of the sulfonated polystyrenes: the segmental α process, a relaxation arising from the presence of hydrogen bonds (α*), and a local β process. The α* process followed Arrhenius behavior, and its relaxation strength decreased significantly with increasing temperature, indicating that the strength is related to the number of associating complexes, which decreases with increasing temperature. A qualitatively similar trend is observed in the infrared absorption indicative of hydrogen bonding over the same temperature range.

Original languageEnglish (US)
Pages (from-to)1815-1820
Number of pages6
JournalMacromolecules
Volume39
Issue number5
DOIs
StatePublished - Mar 7 2006

All Science Journal Classification (ASJC) codes

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

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