| 초록 |
In this work, the effect of oxy-fluorination on surface characteristics of carbon fibers are investigated in mechanical interfacial properties of carbon fibers-reinforced composites. The surface properties of the carbon fibers are determined by X-ray photoelectron spectroscopy (XPS), FT-IR and contact angle measurements. And their mechanical interfacial properties of the composites are studied in interlaminar shear strength (ILSS) and critical stress intensity factor (KIC). As experimental results, the F1S/C1S ratio of carbon fiber surfaces is increased by oxy-fluorination, due to the development of the oxygen containing functional groups. Consequently, the oxy-fluorination leads to an increase of specific components of surface free energy on carbon fibers. The mechanical interfacial properties of the composites, including ILSS and KIC, have been improved in the oxy-fluorination on fibers. These results could be explained that the oxy-fluorination is resulted in the increase of the adhesion of between fibers and matrix in a composite system. |
