Abstract: In this paper, flame retarded epoxy resin (EP) composites containing diethyl phosphinate aluminum (OP930) was prepared and the mechanical properties, morphologies of fracture surfaces, thermal stability, and flame retardancy of EP/OP930 composites with different contents of OP930 have been studied. Results showed that EP/OP930 composite with only 15 wt % OP 930 can achieve the optimal flame retardancy (limiting oxygen index was 28.8 % and reach UL 94 V-0 rating). The composites exhibited satisfying thermal properties as well as good compatibility with the matrix. Compared to neat resin, the mechanical properties of composites were also on a very good level.

Key words: thermal stability, mechanical property, dialkyl phosphinate aluminium, flame retardancy, epoxy resin