| 초록 |
Thermosetting epoxy resin has been applicable to various fields such as adhesives, coatings, and advanced composites. Recently, according with the rise of environmental issues, epoxy resins from bioresources as precursors have been synthesized and researched. In this study, tannic acid (TA) is used as a multifunctional epoxy hardener owing to the possession of phenolic hydroxyl group in its structure. Reaction condition between TA and the epoxy ring of commercially-available diglycidyl ether of bisphenol A (DGEBA) is empirically optimized by dynamic scanning calorimetry (DSC) and Brillouin spectra. Mechanical and flame-retardant properties of TA-based epoxy polymers depending on the ratio of TA:DGEBA are confirmed. These results can be explained by the distinct characteristic of TA such as existence of multiple hydrogen bonding sites in the molecular structure, charring effect, and radical quenching. |
