Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 94, Issue 5, Pages 1912-1916Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/app.20990
Keywords
composites; fibers; recycling; resins
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The recycling of carbon fibers from carbon/epoxy composites was attempted with a solvent method in nitric acid solutions. Gel permeation chromatography and gas chromatography/mass spectrometry showed that the epoxy resin could entirely decompose into low-molecular-weight compounds, and the main components of the dissoluble decomposed compounds were 2,4-dinitrophenol and 2-nitro-4-carboxylphenol. Electron probe microscopy showed no damage to the recycled carbon fibers. The single-fiber tension strength loss of the recycled carbon fibers was 1.1% under the following conditions: a decomposition temperature of 90degreesC, a nitric acid solution concentration of 8M, and a ratio of the sample weight to the nitric acid solution volume of 6 g:100 mL. Through orthogonal experimentation, the recycling conditions for the carbon/epoxy composites were examined. The best combination was a decomposition temperature of 90degreesC, a nitric acid solution concentration of 8M, and a ratio of the sample weight to the nitric acid solution volume of 4 g:100 mL. This method could liquefy raw materials for rocket engine shells reinforced with carbon fibers. (C) 2004 Wiley Periodicals, Inc.
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