| 초록 |
The microwave curing which has been found to be a practicable alternative method for the curing of thermosetting resins offers many distinct advantages over conventional heating, such as, volumetric, fast, direct, selective, instantaneous, and controllable heating. In this work, the microwave radiation is used to cure a diglycdyl ether bisphenol A (DGEBA) epoxy resin with a benzylquinoxalinium hexafluoroantimonate (BQH) as a microwave curable initiator. As experimental results, the effects of cure time on cure behaviors of epoxy resins are discussed in near-infrared spectroscopy (NIRS). The conversions (α) of epoxy resins cured over 20 min are almost similar in the specimens studied. Thermal stabilities determined from thermogravimetric analysis (TGA) are increased with increasing the cure time, which are probably due to the increase of crosslinking density and structural stability, resulting from constant heat diffusion by radiation. Dynamic mechanical properties of cured DGEBA are discussed in dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM). |
