Journal
FUEL CELLS
Volume 13, Issue 2, Pages 107-117Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/fuce.201200010
Keywords
Fuel Cell; Hydrocarbon Polymer; Polymer Electrolyte; SPEEK
Categories
Funding
- EU [GA 245339]
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The cross-link reaction between macromolecular chains of sulfonated poly(ether ether ketone) (SPEEK) by thermal treatment above 150 degrees C in presence of dimethylsulfoxide (DMSO) is investigated by various techniques, including elemental analysis, acid-base titration, infrared spectroscopy, water uptake (WU) measurements, and thermogravimetry. The conditions of thermal treatment are analyzed. The cross-linking reaction occurs in at least three more or less activated and deactivated positions with different activation energies, leading to different time dependencies of the cross-link reaction. The role of residual solvent DMSO is studied particularly: the cross-linking depends significantly on the amount of solvent in the membranes. Implications on WU and thermal stability are of particular importance for the development of high performance proton-conducting membranes.
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