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Humic acid (HA), a biomass material with plentiful oxygen‐containing functional groups, showed huge potential to be considered as a promising charring agent in flame retardancy. In this study, this HA was modified with four different metal ions like Fe2+, Mn2+, Al3+, and Cu2+ and finally, introduced into the epoxy resin (EP) to enhance the flame retardancy of the EP and the dispersion of these flame...
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