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SEM/XPS analysis of fractured adhesively bonded graphite fibre-reinforced polyimide compositesThe surfaces of the graphite fiber-reinforced polyimide composites presently pretreated prior to bonding with polyimide adhesive contained variable amounts of a fluoropolymer, as determined by X-ray photoelectron spectroscopy. Lap shear strengths were determined for unaged samples and for those aged over 500- and 1000-hour periods at 177 and 232 C. Unaged sample lap strengths, which were the highest obtained, exhibited no variation with surface pretreatment, but a significant decrease is noted with increasing aging temperature. These thermally aged samples, however, had increased surface fluorine concentration, while a minimal concentration was found in unaged samples. SEM demonstrated a progressive shift from cohesive to adhesive failure for elevated temperature-aged composites.
Document ID
19850062572
Document Type
Reprint (Version printed in journal)
Authors
Devilbiss, T. A. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Messick, D. L. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Wightman, J. P. (Virginia Polytechnic Institute and State University Blacksburg, United States)
Progar, D. J. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1985
Publication Information
Publication: Composites
Volume: 16
ISSN: 0010-4361
Subject Category
COMPOSITE MATERIALS
Distribution Limits
Public
Copyright
Other