The synergistic effect of layer-by-layer coatings based on binary hybrids of graphene oxide(GO) and carbon nanotube(CNT) on FPU foam is studied.First,the binary hybrids of graphene oxide(GO) and carbon nanotube(CNT) are fabricated onto the surface of FPU foam by layer-by-layer assembled method.Then,the flame retardancy of FPU foams with coating is studied by the use of macro combustion analysis and cone calorimeter.It is found that the FPU foams with binary hybrids(GO/CNT) have lower peak heat release rate ...