Flame Retardancy Study on Phosphorus-Containing Epoxy Resin Synthesized by the Reaction of DOPO and the Diglycidyl Ether of Bisphenol A

A novel phosphorus-containing epoxy resin was synthesized by the reaction of DOPO(9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) and the diglycidyl ether of bisphenol A.The thermostability and flame retardancy after water immersion of phosphorus-containing epoxy resin were characterized by thermogravimetry analysis,limiting oxygen index test and UL-94 vertical combustion test.Test results showed that the intrinsically flame-retardant phosphorus-containing epoxy resin had better thermostability and more persistent flame retardancy,when compared with the phosphate-containing cases.