| 초록 |
To improve thermal stability of epoxy composites, expanded graphite (EG)/epoxy composites were prepared, in which the EG was functionalized by various concentrations of oxygen and fluorine gas. The surface chemical composition of oxyfluorinated EG (OF-EG) was investigated by X-ray photoelectron spectroscopy (XPS). The dispersion and interfacial interaction of these composites were observed by scanning electron microscope (SEM). Also, thermal stability was measured by thermogravimetric analysis (TGA). The OF-EG/epoxy composites showed ~125% and 30% increase of integral procedural decomposition temperature (IPDT) and thermal stability index (A*K) as compared to neat epoxy. Especially, epoxy composite with OF-EG treated by O2:F2=5:5 appeared the highest IPDT and A*K. These results were indicated that oxyfluorination effects on the dispersion and interfacial interaction in epoxy composites which lead to enhance the thermal stability of OF-EG /epoxy composites. |
