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. 2019 Jul 14;11(7):1182. doi: 10.3390/polym11071182

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A–C) Cole-Cole plots of the complex impedance measured in dry conditions at different temperatures for the samples: (☐) PBI@SiNF, (⚪) PBI@SiNF–NH₂ and (Δ) PBI@SiNF–SO₃H. (D) The solid line represents the fitting to the equivalent circuit models shown in Figure 6A. The inset in plots at 40 and 100 °C corresponds to the small arc indicated by the arrow and observed for the composite membrane PBI@SiNF.