Elsevier

Solid State Ionics

Volume 68, Issues 1–2, February 1994, Pages 151-158
Solid State Ionics

Anion dynamics and conductivity in glassy polyelectrolytes - a two-dimensional solid state NMR study

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Abstract

For the first time, the dynamics of the anions of ionically conducting amorphous polyelectrolytes have been investigated by applying one-and two-dimensional solid state13C-NMR techniques. The glass transition in cationic polyelectrolytes of the type “ionenes” is characterized by the softening of a network formed by N+-cations which are linked by organic segments. However, the counterions are already mobile below the glass transition. About 40 K below Tg, the anion dynamics are found to be spatially isotropic on the NMR timescale, which is in good agreement with results obtained by dielectric spectroscopy. The ionic conductivity in the glassy state can be described as thermally activated anion transport. Its high activation energy indicates a cooperative character of the anion motion.

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