Ebrahim Abouzari-Lotf - Phosphonated poly(arylene ether)s as potential high temperature proton conducting materials

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      Abouzari-Lotf, E., Ghassemi, H., Shockravi, A., Zawodzinski, T.,   Schiraldi, D. 52 (21) 4709-4717

      Abstract: The preparation and characterization   of new phosphonated polymeric ionomers based on a fully aromatic   poly(arylene ether) backbone with applications as proton exchange   membranes for fuel cell is reported. The high-molecular-weight   polymers were obtained by the polycondensation of the   phosphonated monomers with decafluorobiphenyl in high yields with   inherent viscosities up to 0.58 dL g-1. The hydrolysis of the   phosphonated ester into phosphonic acid groups was carried out   quantitatively under acidic conditions. The polymers were studied   by TGA after hydrolysis and showed10% weight loss above 430 °C.   Membranes with total ion-exchange capacities above 6 meq/g showed   proton conductivities of approximately92 mS/cm at 25 °C and 100%   relative humidity increasing to ca.150 mS/cm at 140 °C. Their   conductivity under dry condition showed values over 2 mS/cm at   120 °C which upon doping with phosphoric acid jumped to nearly   100 mS/cm. © 2011 Elsevier Ltd. All rights reserved.

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