Abstract: A reagent 2-methy-2,5-dioxo-1,2-oxaphospholane (OP) was introduced into epoxy resin/DDM system as both a flame retardant and a curing agent, for it containing phosphorus atoms and anhydride groups. It was found that OP played a good flame retardant effect on the epoxy resin/DDM system. In the neat epoxy resin, the limiting oxygen index reached 24.2 % and UL94 grade reached V-0 level. When the mole ratio of epoxy and acid anhydride groups was 1:1, the curing process could be completed in 6h at 160 ℃.

Key words: 2-methy-2, 5-dioxo-1, 2-oxaphospholane, epoxy resin, flame retardancy, curing property