[en] Highlights: • A novel hybrid of RGO-LDH/CuMoO₄ was synthesized by co-precipitation method. • RGO-LDH/CuMoO₄ were well-dispersed in EP matrix according to TEM observation. • RGO-LDH/CuMoO₄ has better flame retardancy and smoke suppression for epoxy resin. • The flame retardant mechanism of RGO-LDH/CuMoO₄ was studied. - Abstract: The co-precipitation method was used to synthesize a hybrid with MgAl-layered double hydroxide loaded graphene (RGO-LDH). CuMoO₄ was then introduced onto the surface of RGO-LDH to prepare a hybrid with CuMoO₄ modified RGO-LDH (RGO-LDH/CuMoO₄). The composition, structure and morphology of RGO-LDH/CuMoO₄ were characterized by X-ray diffraction, Laser raman spectroscopy and Transmission electron microscope-energy-dispersive X-ray spectroscopy. It was found that the hybrid of RGO-LDH/CuMoO₄ had been successfully prepared. The effects of flame retardancy and smoke suppression of epoxy resin were studied with added RGO-LDH/CuMoO₄. Results showed that the PHRR and THR of the EP composite with RGO-LDH/CuMoO₄ added were decreased dramatically. The char yield, LOI and UL-94 vertical burning rating of the EP composite were increased, with improved flame ratardancy. In addition, the SPR, TSP, and D_s,max of the EP composite were decreased drastically with added RGO-LDH/CuMoO₄. Its improved flame retardancy and smoke suppression performance were due mainly to the physical barrier of graphene and LDH, and the catalytic carbonization function of LDH. Meanwhile, Cu₂O and MoO₃ generated from RGO-LDH/CuMoO₄ in the combustion process helped enhance the production of char residue and raised the compactness of the char layer.

[en] The original version of this article unfortunately contained a mistake. The presentation of Fig. 1 was incorrect.