The synthesis and properties of new epoxy resin containing phosphorus and nitrogen groups for flame retardancy

A new type of epoxy resin, which contained phosphorus oxide and nitrogen gr oups in the main chain, was synthesized. The structure of the new type of e poxy resin was confirmed by infrared (IR) spectroscopy, H-1 nuclear magneti c resonance (H-1-NMR;IR), and C-13-NMR spectroscopic techniques. In additio n, compositions of the new synthesized epoxy resin (TGDMO) with three curin g agents, for example, bis(3-aminophenyl) methylphosphine oxide (BAMP), 4,4 '-diaminodiphenylmethane (DDM), and 4,4'-diaminodiphenylsulfone (DDS), were used for making a comparison of its curing reactivity, heat, and flame ret ardancy with that of Epon 828 and DEN 438. The reactivities were measured b y differential scanning calorimetry (DSC). Through the evaluation of therma l gravimetric analysis (TGA), those polymers which were obtained through th e curing reactions between the new epoxy resin and three curing agents (BAM P, DDM, and DDS) also demonstrated excellent thermal properties as well as a high char yield. (C) 1999 John Wiley & Sons, Inc.