摘要
Proton exchange membranes based on fluorinated poly（ether sulfone）s with disulfonated naphthyl pendants （sSPFES） have been successfully prepared by post functionalization through polymeric SNAr reaction. Copolymer structure was confirmed by H-nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy, the physico-chemical properties of the sSPFES membranes were evaluated by thermogravimetric analysis, gel permeation chromatography, electro-chemical impedance spectroscopy, atomic force microscopy, Fenton, water-swelling and fuel cell test. The pendant grafting degree was controlled by varying the feeding amount of the disulfonaphthols, resulting in the ion exchange capacity about 1.28-1.73 mmollg. The obtained sSPFES membranes were thermal stable, mechanical ductile, and exhibited dimensional change less than 17%, water uptake below 70%, and proton conductivity as high as 0.17-0.28 S/cm at 90℃ in water. In a single H2/O2 fuel cell test at 80℃, the sSPFESB-3.2 membrane （1.61 mmol/g） showed the maximum power output of 593-658 mW/cm^2 at 60%-80% relative humidity, indicating their rather promising potential for fuel cell applications.
Proton exchange membranes based on fluorinated poly（ether sulfone）s with disulfonated naphthyl pendants （sSPFES） have been successfully prepared by post functionalization through polymeric SNAr reaction. Copolymer structure was confirmed by H-nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy, the physico-chemical properties of the sSPFES membranes were evaluated by thermogravimetric analysis, gel permeation chromatography, electro-chemical impedance spectroscopy, atomic force microscopy, Fenton, water-swelling and fuel cell test. The pendant grafting degree was controlled by varying the feeding amount of the disulfonaphthols, resulting in the ion exchange capacity about 1.28-1.73 mmollg. The obtained sSPFES membranes were thermal stable, mechanical ductile, and exhibited dimensional change less than 17%, water uptake below 70%, and proton conductivity as high as 0.17-0.28 S/cm at 90℃ in water. In a single H2/O2 fuel cell test at 80℃, the sSPFESB-3.2 membrane （1.61 mmol/g） showed the maximum power output of 593-658 mW/cm^2 at 60%-80% relative humidity, indicating their rather promising potential for fuel cell applications.
基金
We gratefully thank the National Natural Science Foundation of China （Grant Nos. 21276128 and 21006052） and the Basic Research Program of Jiangsu Province of China （BK20141398） for the financial supports.
