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Polymers 2015, 7(6), 1066-1087; doi:10.3390/polym7061066

Perfluoro-p-xylene as a New Unique Monomer for Highly Stable Arylene Main-Chain Ionomers Applicable to Low-T and High-T Fuel Cell Membranes

1
Institute of Chemical Process Engineering, University of Stuttgart, Böblinger Straße 78, Stuttgart D-70199, Germany
2
Chemical Resource Beneficiation, North-West University, Potchefstroom 2520, South Africa
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Guiver
Received: 3 April 2015 / Revised: 22 May 2015 / Accepted: 9 June 2015 / Published: 15 June 2015
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Abstract

In this study, we present the synthesis and the characterization of novel functionalized arylene main-chain ionomers based on perfluoro-p-xylene (PFX). The polymers were prepared by polycondensation of PFX and 4,4'-dihydroxybiphenyl or bisphenol 2,2-bis(4-hydroxyphenyl)-hexafluoropropane (bisphenol AF). After polymerization, the PFX unit was still able to undergo nucleophilic aromatic substitution reaction, which was used to introduce phosphonic acid groups into the polymer via a reaction with tris(trimethylsilyl)phosphite. Furthermore, electrophilic sulfonation of these polymers was possible in the bisphenol unit when using H2SO4/SO3 as the sulfonation agent. The so-obtained water-soluble PFX-based polyelectrolytes showed excellent chemical stability and were blended with polybenzimidazoles. The blend membranes formed flexible and mechanically robust films with excellent chemical and thermal stabilities. View Full-Text
Keywords: perfluoro-p-xylene; acid-excess blend membrane; basic-excess blend membrane perfluoro-p-xylene; acid-excess blend membrane; basic-excess blend membrane
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hajdok, I.; Atanasov, V.; Kerres, J. Perfluoro-p-xylene as a New Unique Monomer for Highly Stable Arylene Main-Chain Ionomers Applicable to Low-T and High-T Fuel Cell Membranes. Polymers 2015, 7, 1066-1087.

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