Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 4, Pages 3858-3865Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b04851
Keywords
Biobased materials; Flame retardants; Epoxy resins; Tannic acids
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Funding
- KIST Institutional Program
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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.
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