Nano Composite Membranes of Branched Sulfonated Poly(Ether Ketone Sulfone) and SiO₂ for Fuel Cell Application

Abstract:

Branched sulfonated poly(ether ketone sulfone) copolymer was prepared from1,1,1- tris(4-hydroxyphenyl) ethane, 4,4-difluorophenylsulfone, 3,3'-disodiumsulfonylbenzophenone (40 mol% of bisphenol A) and bisphenol A by polycondensation with the elimination of water in toluene and NMP at 160) in the presence of anhydrous potassium carbonate. Composite membranes were successfully cast from the control of organic polymer with SiO2 4-10 wt% of polymer in DMSO. The films were converted from the salt to acid forms with dilute hydrochloric acid. Organicinorganic composite membranes for operation in polymer electrolyte membrane fuel cells (PEMFCs) were characterized and cell-tested. The physico-chemical properties of all membranes were investigated their thermal properties, water uptake, DSC and thermogravimetric analyzer (TGA). Branched copolymer and nano composite membranes exhibit proton conductivities from 1.7x10-3 to 8.3x10-3 S/cm2, water uptake from 22 to 26%, IEC from 1.28 to 1.46 meq/g and methanol diffusion coefficients from 1.2x10-7 to 1.7x10-7 cm2/S.

• Periodical: Solid State Phenomena (Volumes 124-126)
• Pages: 943-946
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.124-126.943
• Online since: June 2007
• Authors: Tae Whan Hong, Dong Hun Lee, Hae Suck Park, Dong Hwan Suh, Whan Gi Kim
• Keywords: Branched Polymer, Nanocomposite, Polymer Electrolyte Membrane Fuel Cell (PEMFC)

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