| 초록 |
In this work, a direct oxyfluorination method was used to study the effect of oxygen content on surface and mechanical interfacial characteristics of oxy-fluorinated carbon fibers in an epoxy matrix system. The changes of surface functional groups, chemical compositions, and structures of the carbon fibers were characterized by Fourier-transform infrared spectrometer (FT-IR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) measurements. Also, the mechanical interfacial properties of the composites were evaluated by means of interlaminar shear strength (ILSS) and interlaminar fracture toughness (GIC) tests. The results indicated that graphitic carbon was the major carbon functional component on the carbon fiber surfaces and the other functional groups were also existed in C-O, C=O, HO-C=O, and C-Fx after oxyfluorination of carbon fibers. The structure of the oxyfluorinated fibers was not largely changed in the content of oxygen. Consequently, the introduction of oxygen functional groups on the carbon fiber surfaces led to an improvement of the ILSS and the fracture energy of the composites.
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