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The ion conductivity has been studied in comb polyelectrolytes consisting of a polysiloxane backbone with oligoether and lithium-sulfonate terminating perfluoroether sidechains. The room-temperature conductivity was found to reach a maximum of at 33 etheric oxygens per lithium ion. The cation mobility is coupled to the polymer segmental motion and is described by the Vogel-Tamman-Fulcher (VTF) equation. The mechanisms behind ion mobility are studied by means of the VTF parameters B , and In particular, the number of charge carriers as reflected in the parameter is shown to strongly correlate with the conductivity maxima as a function of lithium ion concentration.
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Snyder et al. (2003) studied this question.
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