Abstract: Aluminum phosphate (AHP) and graphene (RGO) were used as flame retardants for poly (1,4-butylene terephthalate)（PBT）. The limit oxygen index and vertical burning tests showed that the addition of suitable amount of RGO could obviously improve the anti-dripping performance of PBT. The Micro calorimeter test showed that the sample of PBT/AHP-0.5 %RGO had the lowest peak heat release rate, which decreased from 518.7 to 433.0 W/g. A proper proportion of RGO could promote the formation of large quantity pores on the surface, which may prevent the escape of the flammable small molecules, thus to improve the flame retardant properties of materials.

Key words: aluminum hypophosphite, graphene, poly (1, 4-butylene terephthalate), flame retardancy, vesicles