Effect of Pressure on Conductivity in Poly(Ethylene Oxide) Complexed with Alkali Metal Salts.
Interim technical rept.,
NAVAL ACADEMY ANNAPOLIS MD DEPT OF PHYSICS
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Audio frequency complex admittance measurements at a number of temperatures have been performed on PEO complexed with various alkali metal perchlorates and thiocyanates at pressures up to 0.2 GPa. In general, the activation volumes tend to increase with the size of both the cation and anion. The trend is best explained if the ion transport mechanism involves both anions and cations. The results are in good agreement with the predictions of a dynamical diffusion theory with an attempt mode Gruneisen parameter appropriate for interchain vibrations. This implies that diffusion takes place via interstice-interstice hopping of the ions. Next, it is shown that free volume considerations lead to unreasonable results if To is interprected as the glass transition temperature. Finally, the effect of pressure on the activation volume is determined.
- Organic Chemistry
- Energy Storage