Blends of Aromatic Polyethers Bearing Polar Pyridine Units and Their Evaluation as High Temperature Polymer Electrolytes |
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| Authors: | Elefterios K Pefkianakis Christina Morfopoulou Valadoula Deimede Joannis K Kallitsis |
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| Institution: | 1. Department of Chemistry, University of Patras, Patras 26504, Greece;2. Department of Chemistry, University of Patras, Patras 26504, Greece
Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Processes (FORTH-ICEHT), P.O. Box 1414, Patras 26504, Greece;3. Advent Technologies S.A., Patras Science Park, Stadiou Str., Patras 26504, Greece |
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| Abstract: | Aromatic polyethers containing polar pyridine units in the main chain have been synthesized using different difluoride monomers. Copolymers of 2,5-(4′,4″dihydroxy biphenyl)-pyridine and 3,3′,5,5′-tetramethyl-1,1′-biphenyl]-4,4′-diol with bis(4-fluorophenyl) sulfone or phenyl phosphine oxide difluoride or decafluorobiphenyl (PTMPySF, PTMPyPO, PTMPyDF) were synthesized. These polymeric structures despite their common structural characteristics, showed totally different behavior in terms of solubility and acid doping ability. Blends of these copolymers have been prepared in order to be evaluated in terms of fuel cell relevant parameters like acid doping ability and conductivity. In most cases flexible membranes were obtained by solution casting. The acid doping ability was controlled based on the blend constituents and composition. The doped membranes exhibited high conductivity values, in the range of 10−3 S/cm at room temperature which is increased at 2.5 × 10−2 S/cm at temperatures up to 180 °C. |
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| Keywords: | blends compatibility copolymerization fuel cells polyethers |
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