31 March 2009 Development of proton exchange membrane from bisphonol S for using in direct methanol fuel cell
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A novel PEM based on sulfonated poly(ether ether ketone) (S-PEEK) was synthesized by the nucleophilic aromatic substitution polycondensation between bisphonol-S and 4,4'-difluorobenzophenone (system A), bisphenol S and 4,4'- dichlorobenzophenone (system B), whose properties are compared with commercial PEEK 150XF (system C) from Victrex. The main difference between the systems A and B is the cost of 4,4'-difluorobenzophenone which is 4 times more expensive than 4,4'-dichlorobenzophenone. Bisphenol-S increase the thermal stability due to its high melting point (245°C). The post-sulfonation reaction was carried out using a concentrated sulfuric acid. Sulfonated poly(ether ether ketone) (S-PEEK) samples were characterized by FTIR and 1H-NMR to confirm the chemical structure of the S-PEEK, by TGA to investigate the thermal property, and by a LCR meter to determine the dependences of the dielectric permittivity on frequency. Both FTIR and 1H-NMR data show the characteristic peaks of sulfonic acid group confirming the successful sulfonation. The PEEK thermal data show 2-steps degradation temperatures. The first degradation represents the splitting of the sulfonic group, and the second is due to polymer backbone degradation. The IEC, DS, and water uptake (%) increase with increasing sulfonation time. Most of all S-PEEK systems showed the dielectric permittivities (ε') were independent with the frequencies.
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Sairung Changkhamchom, Sairung Changkhamchom, Anuvat Sirivat, Anuvat Sirivat, } "Development of proton exchange membrane from bisphonol S for using in direct methanol fuel cell", Proc. SPIE 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009, 728922 (31 March 2009); doi: 10.1117/12.814847; https://doi.org/10.1117/12.814847

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