The flame retardancy and smoke suppression effect of a hybrid containing CuMoO4 modified reduced graphene oxide/layered double hydroxide on epoxy resin
2018
Xu, Wenzong | Zhang, Bingliang | Wang, Xiaoling | Wang, Guisong | Ding, Ding
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 Dₛ,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.
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