PHASE-DIAGRAM OF THE POLY(ETHYLENE OXIDE)CA(CF3SO3)2 SYSTEM

M A MEHTA, P LIGHTFOOT, P G BRUCE

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9 Citations (Scopus)

Abstract

Variable-temperature powder X-ray diffraction (VTXRD) and differential scanning calorimetry (DSC) have been used to determine the poly(ethylene oxide):Ca(CF3SO3)2 phase diagram. A new crystalline complex with a stoichiometry corresponding to 6 ether oxygens/Ca2+ ion has been identified. The data show that this complex exhibits a phase transition at approximately 200-degrees-C between a low temperature, alpha and high temperature, beta, polymorph; at higher temperature the beta polymorph melts incongruently. At lower salt contents, precipitation of Ca(CF3SO3)2 from the amorphous phase upon increasing the temperature is observed, indicating a negative entropy for the dissolution of the salt in the polymer. Finally, temperature dependent conductivities are presented for a range of compositions.

Original languageEnglish
Pages (from-to)1338-1343
Number of pages6
JournalChemistry of Materials
Volume5
Issue number9
Publication statusPublished - Sept 1993

Keywords

  • POLYMER ELECTROLYTES
  • OXIDE)
  • COMPLEXES

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