Optimization of the Surface Free Energy of Carbon Fiber through Electrolytic Oxidation

Fiber surface treatments are a method of improving fiber/matrix adhesion in composite materials. In this study, an electrolytic oxidation process was systematically optimized as a means of altering the interfacial region. A statistical experimental design was utilized to examine the effect of process variables on the surface energy of the carbon fibers. Using a Dynamic Contact Angle Analyzer, in conjunction with the Wilhelmy Plate Technique, the surface energy of each oxidatively treated fiber was determined. These data were used to develop an empirical model relating processing conditions to fiber surface energy. Fiber/matrix adhesion was then related to the polar component of the surface energy by means of the single-fiber fragmentation test.

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