Journal
MACROMOLECULAR RESEARCH
Volume 14, Issue 4, Pages 438-442Publisher
POLYMER SOC KOREA
DOI: 10.1007/BF03219107
Keywords
fuel cell; membrane; poly(aryl ether ketone); polybenzoxazole; sulfonation
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Novel sulfonated poly(aryl ether ketones) containing benzoxazole were directly synthesized by aromatic nucleophilic polycondensation using various ratios of 2,2'-bi[2-(4-flurophenyl)benzoxazol-6-yl]hexafluoropropane to sodium 5,5'-carbonylbis(2-fluorobenzenesulfonate). The copolymers were soluble in polar aprotic solvents such as N-methyl-2-pyrrolidone, N,N-dimethylacetamide, and N,N-dimethylformamide at a relatively high solid composition (> 15 wt%) and formed tough, flexible and transparent membranes. The membranes exhibited a degradation temperature of above 290 degrees C. The exact dissolution times of these membranes at 80 degrees C in Fenton's reagent (3 wt% H2O2 containing 2 ppm FeSO4) were undetectable, confirming their excellent chemical stability in fuel cell application. The membranes showed a moderate increase in water uptake with respect to increasing temperature. The proton conductivities of the membranes were dependent on the composition and ranged from 1.10 X 10(-2) to 5.50x 10(-2) Scm(-1) at 80 degrees C and 95% relative humidity (RH). At 120 degrees C without externally humidified conditions, the conductivities increased above 10(-2) Scm(-1) with respect to increasing benzoxazole content, which suggested that the benzoxazole moieties contributed to the proton conduction.
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