FTIR characterization of thermally cycled PMR-15 compositesChemical characterization results are presented for a variety of PMR-15/graphite composites, differentiated according to prepreg types and cure cycles, which were subjected to 1000 thermal cycles between 0 and 450 F. Fourier transform IR spectroscopy was used in conjunction with diffuse reflectance sampling to examine whether changes in the matrix resin chemistry due to environmental exposure may have contributed to microcracking. Analysis based on compound spectra revealed behavior associated with the oxidation of methylene groups to carbonyl groups on the composite surface; evidence of crosslinking also emerged, although the two phenomena do not appear to be related.
Document ID
19880055138
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Young, Philip R. (NASA Langley Research Center Hampton, VA, United States)
Chang, A. C. (PRC Kentron, Inc. Hampton, VA, United States)