A series of hexachloronadimides containing phosphine oxide in the backbone were synthesized by the reaction of bis(3-amino
phenyl) methyl phosphine oxide (BAP) with pyromellitic dianhydride (PMDA)/3,3’,4,4’-benzophenone tetracarboxylic acid dianhydride
(BTDA)/2,2-bis(3,4-dicarboxy phenyl) hexafluoropropane dianhydride (6F) and hexachloronadic anhydride in glacial acetic acid/acetone.
Structural characterisation of the resins was carried out by infrared, nuclear magnetic resonance spectroscopy and elemental
analysis. Thermal characterisation of uncured resin was done by differential scanning calorimetry and thermogravimetric analysis.
The decomposition temperature of uncured resins were above 31010C with Tmax 33010C in nitrogen atmosphere. Char yield at 800C ranged from 37–42%.