Journal
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
Volume 32, Issue 6, Pages 393-401Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0731684412468369
Keywords
Carbon fibers; electrochemical oxidation; composites; interlaminar shear strength
Categories
Funding
- National Key Basic Research and Development Program [2011CB605602]
- Zhejiang Province Key Science and Technology Innovation Program [2011R50013]
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Polyacrylonitrile-based carbon fibers were electrochemically oxidized under a wide variety of current densities, and then surface changes in the morphological structures and the chemical compositions were characterized by scanning electron microscopy and X-ray photoelectron spectroscopy. Finally, the effects of carbon fiber surface chemistry on the interfacial properties of carbon fiber reinforced composites were researched. The results showed that surface contaminants generated during the production process were removed and the relative contents of oxygen and nitrogen elements increased by 322% and 432%, respectively, after the electrochemical oxidation. Increases in the O/C and N/C ratios resulted in the increase in the interlaminar shear strength values of composites. However, much higher O/C and N/C ratios led to decline in the interlaminar shear strength values. Carboxyl groups were responsible for strong interactions between carbon fiber surfaces and the epoxy resin. When the current densities were more than 5 A/m(2), the interfacial bonding between carbon fibers and the epoxy resin became weak and the interlaminar shear strength values also decreased.
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