Blend miscibility of sulfonated polystyrene ionomers with polystyrene: Effect of counterion valency and neutralization level

Nancy C. Zhou, Wesley Roth Burghardt, Karen I. Winey*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Elastic recoil detection (ERD) was used to characterize the phase behavior of blends involving neutralized poly(styrene-ran-styrenesulfonate) ionomers (P(S-SSx)-M) and deuterated polystyrene (dPS). The lightly sulfonated ionomers (acid mole fraction x = 0.007) were neutralized with various cations (M): sodium (Na+), barium (Ba2+), and zinc (Zn 2+). The dPS:P(S-SS0.007)-M blends have a higher upper critical solution temperature (UCST) than the dPS:P(S-SS0.007) blends, indicating that neutralizing the acid copolymer reduces blend miscibility. The UCST is higher when P(S-SS0.007) is neutralized (125%) with divalent cations, Ba2+ and Zn2+, rather than with a monovalent cation, Na+. In addition, as the level of neutralization increases from 25% to 125%, the miscibility in the dPS;P(S-SS0.007)-Zn blends decreases; this was not observed in the dPS:P(S-SS0.007)-Na blends. Complementary linear viscoelastic measurements were performed on a copolymer and ionomers with a higher acid content. Upon neutralization, the storage moduli at lower frequencies indicate slower polymer chain relaxations and the self-assembly of ionic functional groups. The specific interactions that produce these physical cross-links also impede blend miscibility.

Original languageEnglish (US)
Pages (from-to)6401-6405
Number of pages5
JournalMacromolecules
Volume40
Issue number17
DOIs
StatePublished - Aug 21 2007

ASJC Scopus subject areas

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

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