Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 23, Pages 7770-7775Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.09.061
Keywords
PEM fuel cells; Polymer electrolytes; Thermomechanical properties; DMA
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The mechanical properties of sulfonated aromatic polymers (SAPs: SPEEK and SPPSU) are studied by tensile stress-strain tests and dynamic mechanical analysis (DMA). The elastic moduli are generally above 1 GPa with tensile strength between 25 and 80 MPa and elongation at rupture between 7 and 50%. These properties are consistent with polymers below their glass transition temperature. The glass transition and elastic moduli are strongly increased by thermal treatments of the SAP membranes, due to formation of cross-links between macromolecules. The cross-linking is observed in situ during DMA experiments on thermally untreated SPPSU. These data show that previously neglected SAPS might become very interesting PEM fuel cell membranes, if previously thermally treated. (C) 2009 Elsevier B.V. All rights reserved.
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