| 초록 |
In this study, different fluorination conditions were applied to modify the surface properties of carbon fibers. The F2/N2 and F2/O2 gas mixtures were used in the content of 50/50 mixing ratio. The fluorination temperatures were varied with room temperature, 150℃, 300℃, and 400℃. The relationship between the degree of fluorination and the physicochemical properties of carbon fibers was studied using a combination of single fiber pull-out test and surface analytical technique in order to characterize the fiber/matrix interfacial adhesion. As a result, the surface analyses of fluorinated carbon fibers showed that the oxyfluorination introduced much higher surface functional groups than those of fluorination. And, the surface fluorine concentration of the fiber was increased with increasing the treatment temperature. Interfacial shear strength (IFSS) of fluorinated carbon fibers-reinforced composites was found to be an increase with increasing the fluorination temperature. This was probably due to the fact that the fluorine on carbon fibers was effective in altering its surface physical chemistry and polarity, resulting in improving the interfacial adhesion in fiber/matrix.
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