Conductivities for a wide variety of ionically conducting polymer electrolytes with a range of salt compositions have been investigated over the temperature region T g to 370 K. When the conductivity data are analyzed as a function of temperature using the empirical Vogel‐Tammann‐Fulcher (VTF) equation a common trend is observed in that deviations in the fits to the data invariably occur in the temperature range 1.2 T g to 1.4 T g for all of the samples investigated. This deviation is interpreted as a decoupling of the ions from polymer segmental motion. Recent 23 Na NMR and 22 Na positron annihilation studies of sodium salt‐based polymer electrolytes support this interpretation with evidence of a change in dynamics at about 1.2 T g .
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Chung et al. (1994) studied this question.
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