Abstract:In recent years, benzoxazine resins have attracted increasing attention in academia and many industrial manufacturing industries due to good thermal, chemical, electrical and mechanical properties, in addition to their low melt viscosity, the addition of no catalyst and no small molecule released during the curing process. The benzoxazine monomer has sixelement O, N-containing heterocyclic structure, and a compound with N-containing mesh structure similar as phenolic resin can be polymerized through ringopening polymerization, which is hard to burn, however, the flame retardant property of traditional benzoxazine resin still can not meet application demand of high flame retardant field, which restricting their applications as matrices for some high-performance composites. Therefore, the flame-retarded modification and application of benzoxazine have aroused great interest. In this paper, the flame-retarded modification of benzoxazine resin in recent years were reviewed from the aspects of intrinsically flame-retarded modification, copolymerization modification and physical blending modification. Meanwhile, the application of benzoxazine as flame retardant synergist was summarized, and the flame retardant modification directions of benzoxazine were prospected.