Journal
MACROMOLECULES
Volume 42, Issue 23, Pages 9302-9306Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma901953e
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Novel proton exchange membranes were prepared and investigated as polymer electrolyte membranes (PEMs) for polymer electrolyte membrane fuel cells (PEMFCs). Polymers having poly(arylene ether sulfone) in the main chain and -CF2CF2OCF2CF2SO3H in the side chain (PES-PSA) were synthesized by dehalogen coupling of poly{oxy-4,4'-(3,3'-dibromobiphenylene)oxy-4,4'-diphenylsulfone} (PES-Br) and potassium 1,1,2,2-tetrafluoro-2-(1,1,2,2-tetrafluoro-2-iodoethoxy)ethanesulfonate (PSA-K) using copper metal, followed by treatment with aqueous HCl. The proton conductivity of PES-PSA with an ion exchange capacity (IEC) of 1.58 mmol/g was 0.12 S/cm at 80 degrees C under 90% relative humidity. PES-PSA with an IEC of 1.34 mmol/g was used as the membrane for PEMFC, and the maximum power Output at 80 degrees C was 805 mW/cm(2) when fully humidified hydrogen and air were provided. A DMA measurement and a tensile test revealed that PES-PSA had a higher alpha-relaxation temperature than Nafion and higher flexibility than sulfonated polyethersulfone (SPES).
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