| 초록 |
To improve thermal property of epoxy composites, expanded graphite (EG)/epoxy composites were prepared, in which the EG was modified by different oxyfluorination conditions. The surface-chemical property of oxyfluorinated EG was investigated by X-ray photoelectron spectroscopy (XPS). The fracture surfaces and thermal property of these composites were measured by scanning electron microscope (SEM) and thermogravimetric analysis (TGA) according to the conditions of oxyfluorination. The oxyfluorinated EG/epoxy composites showed ~27% enhancement of thermal stability as compared to neat epoxy. Especially, OF55-EG/epoxy composite appeared the highest thermal stability. These results were indicated that interfacial interaction between EG and epoxy resin was improved by oxyfluorination due to the functional groups including oxygen and fluorine which increase the polarity on the surface of EG. Therefore, oxyfluorination improved the thermal property of EG/epoxy composites. |
