Abstract: A novel cyclophosphazene flame retardant monomer with allyl group, 2-allyl phenoxy-pentaphenoxycyclotriphosphazene(APPCP), was synthesized by using hexachlorocyclotriphosphazene(HCCP), 2-allylphenol and phenol as the starting materials. The structure of the product was characterized by FTIR, MS, 1H NMR and elemental analysis. The flame retardant acrylate resin was prepared through copolymerized with APPCP and acrylate resin monomers, and the effects of APPCP on the thermal and flame-retardant properties were investigated. With the addition of 20%APPCP, the flammability class of the copolymerized acrylate resin was attained to V-0, with the limiting oxygen index(LOI) value increased to 31.2%, and the residual mass up to 23.2% at 600 ℃.

Key words: cyclotriphosphazene, flame retardant, acrylate, copolymerization