Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE In this study, a cyano group-containing organophosphate salt flame retardant, BAP, was synthesized. Whilst enhancing the flame retardancy of EP, it also improved its mechanical properties, thereby offering a new approach for the application of high-performance EP.

ABSTRACT
Within the domain of epoxy resin (EP) flame retardant modification, research indicates that single-component flame retardants are often insufficient to meet comprehensive performance requirements. Consequently, the development of synergistic flame-retardant systems incorporating multiple elements and structural motifs is increasingly advocated. Organophosphate salt flame retardants have gained significant attention due to their simple synthesis and remarkable efficacy. The introduction of cyano groups, which possess catalytic carbonization capabilities, into flame retardants can further enhance their flame-retardant efficiency. Additionally, the highly polar nature of cyano groups theoretically exerts positive effects on both the curing process and mechanical properties of epoxy resins. The study reports the synthesis of a cyano group-containing organophosphate salt flame retardant, designated BAP, achieved through a proton transfer reaction introducing a cyano group into a phosphorus-containing small molecule. Analysis revealed that incorporating BAP enhanced both the mechanical properties and flame retardancy of EP.