Sulfonated Poly(Ether Ether Ketone)(S-PEEK) as Derived from Bisphenol-S for a Proton Exchange Membrane (PEM) in Direct Methanol Fuel Cells (DMFC)
The currently used Proton Exchange Membrane (PEM) in a Direct Methanol Fuel Cell (DMFC) is NafionÒ, an excellent proton conductor in a fully hydrated membrane. However, it has major drawbacks, such as very high cost, and loss of conductivity at elevated temperature and low humidity. In this work, a novel PEM based on sulfonated poly(ether ether ketone) (S-PEEK). Poly(ether ether ketone) (PEEK) was synthesized by the nucleophilic aromatic substitution polycondensation of Bisphonol-S and 4,4'-difluorobenzophenone for system A, and Bisphenol S and 4,4'-dichlorobenzophenone for system B. Bisphenol-S helps to increase the thermal stability due to its high melting point (245°C). The post-sulfonation reaction was performed by using 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, and by TGA to investigate the thermal property.
Pietro VINCENZINI and Giuseppe D'ARRIGO
S. Changkhamchom and A. Sirivat, "Sulfonated Poly(Ether Ether Ketone)(S-PEEK) as Derived from Bisphenol-S for a Proton Exchange Membrane (PEM) in Direct Methanol Fuel Cells (DMFC)", Advances in Science and Technology, Vol. 54, pp. 255-260, 2008