The flame retardancy and smoke suppression effect of a hybrid containing CuMoO4 modified reduced graphene oxide/layered double hydroxide on epoxy resin

Abstract The co-precipitation method was used to synthesize a hybrid with MgAl-layered double hydroxide loaded graphene (RGO-LDH). CuMoO 4 was then introduced onto the surface of RGO-LDH to prepare a hybrid with CuMoO 4 modified RGO-LDH (RGO-LDH/CuMoO 4 ). The composition, structure and morphology of RGO-LDH/CuMoO 4 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/CuMoO 4 had been successfully prepared. The effects of flame retardancy and smoke suppression of epoxy resin were studied with added RGO-LDH/CuMoO 4 . Results showed that the PHRR and THR of the EP composite with RGO-LDH/CuMoO 4 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/CuMoO 4 . 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, Cu 2 O and MoO 3 generated from RGO-LDH/CuMoO 4 in the combustion process helped enhance the production of char residue and raised the compactness of the char layer.