Abstract

Conductivity and glass transition temperature data were collected for poly (propylene oxide)-K/NaSCN mixed alkali systems. Polymer complexes containing various mole fractions of potassium and sodium were prepared. Polymer systems with mixed mole fraction but varying total cation concentration were also made. The mixed-alkali effect was observed as a minimum in the conductivity data at a potassium mole fraction of 0.25 for all polymer salt complexes. The conductivity versus concentration data were fitted to an equation derived from the Vogel-Tamman-Fulcher equation where the glass transition temperature is assumed to be a linear function of salt concentration. Differential scanning calorimetry data may indicate that ion groupings in the polymer may be mixed K +/Na + in nature.

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