Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 415, Issue -, Pages 42-50Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2012.04.057
Keywords
Thermal crosslinking; High temperature PEMFC; Proton exchange membrane; Membrane properties; Cell performance
Categories
Funding
- European Commission through the program Understanding the Degradation Mechanisms of Membrane-Electrode-Assembly for High Temperature PEMFCs and Optimization of the Individual Components'' [DEMMEA FCH-JU 245156]
- European Commission through the program Development of an Internal Reforming Alcohol High Temperature PEM Fuel Cell Stack'' [IRAFC FCH-JU 245202]
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New aromatic polyethers containing main chain polar pyridine groups, as well as crosslinkable side chain double bonds, have been synthesized employing various comonomers' ratios affording soluble high molecular weight copolymers. The new copolymers were characterized and thereafter subjected to thermal curing above the glass transition temperature without the use of crosslinking agent that successfully led to their crosslinked analogs. The properties of the crosslinked materials in respect to their potential use as high temperature polymer electrolytes were thoroughly investigated. All materials exhibit excellent film forming properties and advanced chemical and physicochemical properties with high oxidative stability, mechanical integrity, high glass transition temperatures (T-g even above 330 degrees C) and thermal stability up to 400 degrees C. The doping ability in phosphoric acid was decreased compared to the non-crosslinked copolymers. Despite the moderate phosphoric acid doping levels, in-situ conductivity reached values above 5 x 10(-2) S cm(-1). Polarization curves were obtained at temperatures up to 220 degrees C demonstrating their feasibility to be used as electrolytes for high temperature PEM fuel cells. (c) 2012 Elsevier B.V. All rights reserved.
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