Kim, Young-O Cho, Jaehyun Yeo, Hyeonuk Lee, Byoung Wan Moon, Byung Joon Ha, Yu-Mi Jo, Ye Rin Jung, Yong Chae 2024-01-19T20:34:18Z 2024-01-19T20:34:18Z 2021-09-02 2019-02-18 2168-0485 https://pubs.kist.re.kr/handle/201004/120340 Flame retardant epoxy is closely related to the safety of a humans life against the surrounding fire threat. Flame retardant properties can be obtained by supplementing with additives, such as phosphorus compounds and nanomaterials, or synthesizing flame retardant monomers. The principle of improving flame retardancy is based on the capture of oxygen radicals and the formation of a char layer, which blocks flammable gases. This paper focuses on a flame retardant epoxy resin using naturally occurring tannic acid (TA) as a hardener, which is both an oxygen-radical quencher and a charring agent. TA is reacted with the commercially available diglycidyl ether of bisphenol A (DGEBA). The reaction between the epoxy ring of the DGEBA and multiple functional groups in TA is empirically demonstrated using dynamic scanning calorimetry (DSC) and Brillouin spectra. The most effective flame-retardant TA-DGEBA (TD) thermoset had an limiting oxygen index (LOI) value 46% higher than the control sample. This result suggests that TA-based epoxy resins could be promising flame-retardant polymers. English American Chemical Society MECHANICAL-PROPERTIES DIGLYCIDYL ETHER FIRE PERFORMANCE RESIN COMPOSITES NANOCOMPOSITES THERMOSETS MONOMER Flame Retardant Epoxy Derived from Tannic Acid as Biobased Hardener Article 10.1021/acssuschemeng.8b04851 1 ACS Sustainable Chemistry & Engineering, v.7, no.4, pp.3858 - 3865 ACS Sustainable Chemistry & Engineering 7 4 3858 3865 scie scopus 000459367400024 2-s2.0-85061542082 Chemistry, Multidisciplinary Green & Sustainable Science & Technology Engineering, Chemical Chemistry Science & Technology - Other Topics Engineering Article MECHANICAL-PROPERTIES DIGLYCIDYL ETHER FIRE PERFORMANCE RESIN COMPOSITES NANOCOMPOSITES THERMOSETS MONOMER Biobased materials Flame retardants Epoxy resins Tannic acids