▎ 摘　　要

Soaring development in widely applicable materials raises an urgent demand to develop high-performance epoxy resin (EP) materials combining superior flame retardancy, smoke suppression and mechanical properties. Phosphorus, boron and nitrogen-containing flame retardants are high potential environmental-friendly flame-retardant additives in polymer manufacturing owing to their low toxicity, molecular diversity, and efficient flame resistance. In this paper, a novel additive flame retardant of RGO-HCCP@MPB compound was fabricated which involved the functionalization of reduced graphene oxide (RGO) with hexachlorocyclotriphosphazene (HCCP), and the simple complexing RGO-HCCP with melamine phosphate borate (MPB). The prepared RGO-HCCP@MPB was then directly mixed with EP matrix to evaluate its flame resistance. It found that the addition of RGO-HCCP@MPB obviously inhibited the heat release and smoke emission behaviors of EP matrix during combustion. With 5 wt% addition of RGO-HCCP@MPB in EP, the LOI value of EP/RGO-HCCP@MPB reached up to 28.4%, the peak heat release rate (PHRR) and the total heat release (THR) decreased by 61.1% and 30.5% compared to neat EP, respectively. Furthermore, the flexural strength and flexural modulus of the EP/RGO-HCCP@MPB were also promoted compared with that of the pure EP. The flame-retardant mechanism shows that elements of boron (B), nitrogen (N) and phosphorus (P) in RGO-HCCP@MPB compound play a synergistic role in the enhancement of the flame retardancy of EP in a combustion.