To improve the flame-retardant performance of epoxy resin (EP), EP composites were developed using aluminum diethylphosphonate (ADP) and melamine polyphosphate (MPP) as a compound flame retardant, and calcium-based MOF (calcium terephthalate, CaT) as a synergist (MOF refers to metal-organic frameworks). The results demonstrated that the combination of CaT and ADP/MPP significantly enhanced the flame-retardant properties of EP. With only 2% CaT and 5% ADP/MPP (relative to the mass of EP), the LOI value of EP composite reached 33.8%, and UL-94 V-0 grade was achieved. The peak heat release rate, the total heat release and the total smoke production values decreased by 44.2%, 25.6%, and 52.0%, respectively. The addition of a small amount of CaT improved the mechanical strength and toughness of EP. The relevant mechanism was discussed to explain the synergistic effect of CaT and ADP/MPP in EP. The results indicated that the incorporation of CaT not only enhanced the stability of char layer but also suppressed the release of toxic gases during combustion. As a cost-effective MOF material, CaT has a potential application in improving the fire safety of EP.
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