Morphology of Lightly Carboxylated Polystyrene Ionomers

Hidemi Tomita, Richard A. Register

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Lightly carboxylated polystyrene (CPS) ionomers have been synthesized via free-radical copolymerization of styrene and 4-vinylbenzoic acid, and their morphology and properties compared with those of lightly sulfonated polystyrene (SPS) ionomers. CPS ionomers neutralized with Na+ give SAXS patterns similar to those exhibited by SPS ionomers, suggesting rather complete aggregation of ionic groups. However, when neutralized with Zn2+, a poorly-ordered morphology is produced, with many ionic groups remaining unaggregated. Differences are also evident in the dynamic mechanical behavior, with NaCPS exhibiting a strong high-temperature relaxation peak whose temperature increases faster than that of the matrix glass transition, while ZnCPS shows a weak high-temperature peak whose temperature increases in step with the matrix transition. By using a weaker acid substituent, cation effects on morphology are amplified relative to those seen in SPS ionomers.

Original languageEnglish (US)
Pages (from-to)2791-2795
Number of pages5
JournalMacromolecules
Volume26
Issue number11
DOIs
StatePublished - 1993

All Science Journal Classification (ASJC) codes

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

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