Chemical Attack of Graphite/Epoxy by Hydrogen Peroxide

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Techniques for studying the mechanisms of chemical corrosion in fiber-reinforced plastics are of considerable importance. The most common analysis technique for studying chemical changes in polymers is Fourier transform infrared (FT-IR) spectroscopy. For polymers reinforced with graphite fibers, however, study of the matrix is hindered by the presence of the graphite, which strongly absorbs IR radiation in a broad band of wavelengths. The purpose of this study was to investigate the degradation of AS-4/3501-5a graphite/epoxy composite material exposed to solutions of hydrogen peroxide. Evidence was also sought for degradation in high pH (up to pH = 12) solutions. After long-term environmental exposure, a simple gravity flotation technique was used to separate the epoxy matrix from the graphite fibers for FT-IR analysis. The resulting spectroscopic evidence indicates that hydrogen peroxide attacks the secondary amines in the cured epoxy structure. No evidence of attack by high pH solutions was found.

Keywords: Composite materials; Corrosion; FTIR spectroscopy; Graphite/epoxy; Hydrogen peroxide; Hydroxide; Infrared; pH

Document Type: Research Article


Affiliations: University of California, San Diego, La Jolla, California 92093-0222; current address: Allied Fibers Technical Center, SPECTRA Composites Group, P.O. Box 31, Petersburg, VA 23804

Publication date: March 1, 1992

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