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By Gerhard Maier, Jochen Meier-Haack (auth.), Günther G. Scherer (eds.)

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108 S/cm at 90 ◦ C) of all samples under investigation in this study due to the formation of an interpenetrating ionic network. Further increase of the DS of sPAES resulted in a demixing of the different blocks. In order to get sulfonated polysulfones with the functional groups in the side-chain and a predefined degree of sulfonation, Meier-Haack et al. prepared polysulfones with phenylhydroquinone moieties in the backbone [126–128]. The sulfonation was conducted with various sulfonating agents, such as concentrated sulfuric acid or chlorosulfonic acid trimethylsilylester.

In more fundamental works, Kim et al. studied the influence of (hydro)thermal pre-treatment and the state of water in sulfonated polymers on the membrane performance [166–168]. Again, BPSH samples with different degree of sulfonation were used for the investigations. Kim indicated three Sulfonated Aromatic Polymers for Fuel Cell Membranes 53 Fig. 29 Proton conductivities of sulfonated poy(arylene ether sulfone) membrane and its blend with a heteropolyacid in comparison with Nafion® 117 (data taken from [164]) irreversible morphological states (regimes, borders indicated by arrows in Fig.

20 G. Maier · J. Meier-Haack Fig. 2 Sulfonated Poly(Arylene Ether Ketone)s in DMFC Sulfonated poly(aryl ether ketone)s appear to have their merits especially in DMFC, where one of the problems of current commercially available perfluorinated membranes is the relatively high methanol permeability, which translates to a reduced power efficiency of the fuel cell. Sulfonated poly(arylene ether ketone)s have been shown to possess lower methanol permeability than Nafion® by a factor of 3–4 (corrected for membrane thickness) [42].

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