탄소섬유의 양극산화가 탄소섬유 강화 복합재료의 기계적 계면 특성에 미치는 영향 = Effect of Anodized Carbon Fiber Surfaces on Mechanical Interfacial Properties of Carbon Fibers-reinforced Composites

다국어 초록 (Multilingual Abstract)

In this work, the effect of anodic oxidation on surface characteristics of high strength PAN-based carbon fibers was investigated in mechanical interfacial properties of composites. The surface properties of the carbon fibers were determined by acid-base values, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and contact angles. And their mechanical interfacial properties of the composites were studied in interlaminar shear strength (ILSS) and critical stress intensity factor (K_IC). As a result, the acidity or the O_ls/C_ls ratio of carbon fiber surfaces was increased, due to the development of the oxygen functional groups. Consequently, the anodic oxidation led to an increase in surface free energy of the carbon fibers, mainly due to the increase of its specific (or polar) component. The mechanical interfacial properties of the composites, including ILSS and K_IC, had been improved in the anodic oxidation on fibers. These results were explained that good wetting played an important role in improving the degree of adhesion at interfaces between fibers and epoxy resin matrix.