Surface properties of oxyfluorinated PAN-based carbon fibers |
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Authors: | Young-Seak Lee Byoung-Ky Lee |
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Affiliation: | a Nanotechnology Center, Department of Chemical Engineering, Sunchon National University, Sunchon 540-742, South Korea b Advanced Materials Research Center, Chungnam National University, Taejon 305-764, South Korea |
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Abstract: | In this study, the oxyfluorination of PAN-based carbon fibers was undertaken at room temperature using fluorine-oxygen mixtures, and the influence of oxyfluorination on properties such as wettability, surface polarity, surface free energy, conductivity and tensile strength was investigated. As the oxyfluorination time increased at a total pressure of 5 kPa, both the fluorine/carbon and oxygen/carbon ratios increased. The contribution of semicovalent C-F bond to F1s spectra is considerably decreased with increasing total pressure from 5 to 80 kPa, and at the same time, the contribution of covalent C-F bond is increased. As the total pressure of fluorine-oxygen mixtures increased, the contact angle of water significantly decreased and again increased to a similar value to that of as-received carbon fiber. A short oxyfluorination of carbon fibers considerably increased the wettability, that is, hydrophilicity.The electrical conductivity of oxyfluorinated carbon fiber is larger than that of the as-received fiber. This is because the surface region of carbon fiber is fluorinated. An increase in the tensile strength of about 18% after oxyfluorination is observed. The increase in tensile strength of oxyfluorinated carbon fibers can be understood as being due to a decrease in the diameter of the fiber. |
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Keywords: | A. Carbon fibers B. Surface treatment D. Functional groups, Surface properties |
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