| 초록 |
In this work, the fluorine-containing epoxy resin 2,2-diglycidylether of benzotrifluoride (FER) was prepared by reaction of 2-chlorobenzotrifluoride with glycerol diglycidylether in the presence of pyridine catalyst. The structure of the synthesized FER was confirmed by FT-IR, 13C NMR, and 19F NMR spectroscopy. The 4,4'-diaminodiphenol methane (DDM) was used as a curing agent. The cure activation energies (Ea) were determined by Flynn and Walls equation with dynamic differential scanning calorimetry (DSC). The glass transition temperature (Tg) was investigated by dynamic mechanical analysis (DMA). For the mechanical properties of the casting specimens, the critical stress intensity factor (KIC) and bending test were performed and their fractured surfaces were examined by using a scanning electron microscope (SEM). As a result, Ea and Tg of FER/DDM system were 53 kJ/mol and 86℃, respectively. KIC of the cured specimen showed higher values than commercial DGEBA epoxy resins. This was probably due to the introduction of trifluoromethyl (CF3) group into the side chain of the epoxy resins.
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