Structural and thermal characterisation of nadimide resins

A series of hexachloronadimides containing phosphine oxide in the backbone were synthesized by the reaction of bis(3-amino phenyl) methyl phosphine ox ide (BAP) with pyromellitic dianhydride (PMDA)/3,3',4,4'-benzophenone tetra carboxylic acid dianhydride (BTDA)/2,2-bis(3,4-dicarboxy phenyl) hexafluoro propane dianhydride (6F) and hexachloronadic anhydride in glacial acetic ac id/acetone. Structural characterisation of the resins was carried out by infrared, nucl ear magnetic resonance spectroscopy and elemental analysis. Thermal charact erisation of uncured resin was done by differential scanning calorimetry an d thermogravimetric analysis. The decomposition temperature of uncured resi ns were above 310+/-10 degreesC with T-max 330+/-10 degreesC in nitrogen at mosphere. Char yield at 800 degreesC ranged from 37-42%.