Preparation and Characterization of Sulfonated Poly(ether Sulfone) Using 4,4-Bis(4-Hydroxylphenyl)valeric Acid for Proton Exchange Membrane Fuel Cell Application

Dong Wan Seo; Young Don Lim; M. S. Islam Mollah; Soon Ho Lee; Sang Ho Moon; Sang Young Pyun; Whan Gi Kim

doi:10.4028/www.scientific.net/MSF.620-622.73

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HomeMaterials Science ForumMaterials Science Forum Vols. 620-622Preparation and Characterization of Sulfonated...

Preparation and Characterization of Sulfonated Poly(ether Sulfone) Using 4,4-Bis(4-Hydroxylphenyl)valeric Acid for Proton Exchange Membrane Fuel Cell Application

Abstract:

Poly(ether sulfone)s (PES) containing 25-75 mol % valeric acid were prepared with bisphenol A, bis(4-chlorophenyl)sulfone and 4,4-Bis(4-hydroxylphenyl)valeric acid using potassium carbonate in DMAc (dimethylacetamide) at 160 °C. Copolymers containing carboxylacid group were reduced to hydroxy group by BH3 solution 1M in THF and NaBH4 co-catalyst. Sulfonated poly(ether sulfone)s (S-PES) were obtained by reaction of 1,3-propanesultone and the reduced copolymer (PES-OH) with potassium t-butoxide. A series of copolymers were studied by 1H-NMR spectroscopy, differential scanning calorimetry (DSC), and thermo gravimetric analysis (TGA). Sorption experiments were conducted to observe the interaction of sulfonated polymers with water and methanol. The S-PES membranes exhibited proton conductivities from 1.20  10-3 to 3.40  10-3 S/cm, water swell from 12.25 to 31.50 %, IEC from 0.43 to 0.72 meq/g and methanol diffusion coefficients from 3.60  10-7 to 4.90  10-7 cm2/S at 25 °C.

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Materials Science Forum (Volumes 620-622)

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73-76

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https://doi.org/10.4028/www.scientific.net/MSF.620-622.73

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April 2009

Authors:

Dong Wan Seo, Young Don Lim, M. S. Islam Mollah, Soon Ho Lee, Sang Ho Moon, Sang Young Pyun, Whan Gi Kim

Keywords:

Fuel Cell (FC), Fuel Cell Membrane, Poly(ether sulfone), Proton Exchange Membrane Fuel Cell

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