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Stoichiometry of Formation and Conductivity Response of Amorphous and Crystalline Complexes Formed Between Poly(ethylene oxide) and Ammonium Salts: PEO x · NH 4 SCN and PEO x · NH 4 SO 3 CF 3
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1984
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Materials ScienceInorganic ChemistrySolid-state IonicConducting PolymerEngineeringApproximate Phase DiagramPolymer ScienceIonic ConductorConductivity ResponsePhysical ChemistryChemistryCf 3Phase DiagramAmorphous SolidFunctional MaterialsPolymer ChemistryEthylene OxidePolymers
Stoichiometries have been studied for the interaction between poly(ethylene oxide) and the ammonium salts and in the polymer to salt composition range 10:1 to 2:1. A single crystalline phase having the approximate composition was identified, and an approximate phase diagram was constructed. The system is more complex, and a phase diagram was not obtained; however, at least two compounds of 8:1 and 4:1 stoichiometry are indicated. Conductivity plots indicate that the metastable amorphous phase of the various materials has a conductivity approximately 103 Ω−1 cm−1 higher than that of the crystalline phase at room temperature. The ion rather than H+ is implicated as a charge carrier. We were not successful in determining transference numbers for anions and cations.