Glass transition and ionic conduction in plasticized and doped ionomers

Shihai Zhang, Shichen Dou, Ralph H. Colby, James Runt

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89 Scopus citations


The relationship between ionic conduction and matrix glass transition was investigated in selected plasticized and doped poly((ethylene glycol) n-co-5-sulfoisophthalate lithium) ionomers. Plasticization with a poly(ethylene glycol) oligomer significantly increases the ionic conductivity, despite a decrease in lithium concentration. Doping with LiClO4 leads to much lower conductivity, despite the increase in Li+ content. These observations were reconciled by considering the corresponding change in ionomer glass transition temperature (Tg), and it was found that ionomers with different plasticizer/dopant levels exhibit similar conductivity at constant T - Tg. The fact that Tg plays such a strong role suggests that Li+ ion mobility is controlled by segmental motion of PEO.

Original languageEnglish (US)
Pages (from-to)2825-2830
Number of pages6
JournalJournal of Non-Crystalline Solids
Issue number33-36 SPEC. ISS.
StatePublished - Sep 15 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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