High ionic conductivity in PEO. PPO block polymer + salt solutions

Rongjian Xue, C. A. Angell

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

The conductivity of LiI dissolved in a block copolymer of polypropylene and polyethylene oxide sections of comparable length has been measured and found greater than for either of the pure polymer solutions. The composition of maximum conductivity occurs at low concentration as predicted from entropy theories in which the salt mainly serves to raise the glass transition temperature. A VTF equation gives a good description of the temperature dependence at high salt concentrations. At low concentrations, however, complications due to redistribution of salt between the distinct microregions of the microscopically segregated block units, causes a complex temperature dependence. At intermediate compositions two distinct glass transitions are observed. These blend into a single transition as the microregions blend at high salt concentrations.

Original languageEnglish (US)
Pages (from-to)223-230
Number of pages8
JournalSolid State Ionics
Volume25
Issue number2-3
DOIs
StatePublished - Nov 1987

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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