期刊
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
卷 29, 期 14, 页码 2156-2169出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0731684409341756
关键词
wettability; surface treatments; voids
资金
- Office of Naval Research [N00014-05-1-0341]
High-strength carbon fibers were oxidized by exposure to nitric acid and single-fiber wettability predictions were compared to the actual wettability of multiple fibers in resin. Single-fiber wettability was predicted through contact-angle measurements and surface-energy calculations. Multiple-fiber wettability in resin was evaluated by immersing treated fiber bundles in catalyzed vinyl ester resin, followed by cross-sectional viewing after curing. Fiber cohesion, macro-composite void content, and transverse tensile strength were also examined as a function of fiber treatment time. Fiber surface energy increased with treatment time, suggesting improved wettability. However, fiber cohesion also increased and composite wetting was found to suffer. Increasing fiber treatment times resulted in larger unwetted areas, higher void content, and declining transverse tensile strength.
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