▎ 摘　　要

Graphene oxide (GO) was functionalized with phosphorus-containing groups to give the flame retardancy to the polypropylene (PP)/GO nanocomposites. The composites were prepared via melt mixing with maleic anhydride-grafted PP (MAPP) as a compatibilizer. Through the Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS), covalently-bonded flame retardant moieties on GO were characterized. The effect of the functionalization of GO and the use of compatibilizer on the morphology, flame retardancy, and mechanical properties of the PP/GO composites were investigated. SEM observation of the composites showed that the addition of MAPP improved the exfoliation and dispersion state of the GO sheets by improving the interfacial interaction between the filler and the matrix. For PP/functionalized GO composites, the limiting oxygen index (LOI), Young's modulus, and tensile strength were increased compared with PP/GO composites.