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Nano Composite Membranes of Sulfonated Poly(ether sulfone) Containing 4,4-Bis(4-hydroxylphenyl)valeric Acid and SiO2 for PEMFC

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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. Composite membranes were prepared with copolymers and SiO2 nanoparticles(20 nm, 4-10 wt%). The composite membranes were cast from DMSO.A series of composite membranes 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.

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Periodical:

Materials Science Forum (Volume 695)

Pages:

37-40

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.695.37

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Online since:

July 2011

Authors:

Young Don Lim, Dong Wan Seo, Soon Ho Lee, Md. Monirul Islam, Hyun Mi Jin, Ho Hyoun Jang, Insuk Jeong, Whan Gi Kim

Keywords:

Electrolyte, Fuel Cell (FC), Membrane, Nanocomposite, PEM, PES, Polymer, SiO2, Sulfonation, Valeric Acid

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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