Dielectric Relaxation and Conductivity Study of Polytetrafluorene‐Ethyl Ionomers

1 October 1992

journal article
Published by The Electrochemical Society in Journal of the Electrochemical Society

Vol. 139 (10) , 2871-2874
https://doi.org/10.1149/1.2068994

Abstract

Dielectric relaxation measurement was performed on the containing ionomer from Dow Chemical with poly‐tetrafluoro‐ethylene (PTFE) backbones. The temperature Cole‐Cole plot of the complex permittivity was employed to separate the dielectric relaxation of the polar groups from the conducting ions at low temperatures. The resulting conductivities reached 10⁻² S/cm at 295 K, comparable to that of Nafion®. The temperature dependence of the dc resistance was found to be non‐Arrhenius and fitted by the Vogel Tamman‐Fulcher expression , yielding a of 90 K and of 0.12 eV. The difference between this and the is much larger (over 250 K) than that of PEO (≈50 K). The polar‐group relaxation extracted at temperatures between 90–160 K produced an activation energy of 0.075 eV. This relaxation is attributed to the restricted water molecules and pendant groups of PTFE affecting the ion transport.

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