Synthesis and characterisation of polyamideimides from bis(4†trimellitimidophenyl)sulfone

Several polyamideimides have been synthesised by the interaction of a number of aromatic diamines with an imidedicarboxylic acid. Since these polymers incorporated a preformed imide group, they did not pose the common problems encountered in imidisation of polyamic acids. They were synthesised by low temperature (<5°C) polycondensation, in 75–92% yields and had viscosities in the range 0.18–0.39 dl/g. They were characterised by IR spectra, elemental analysis, X‐ray and thermal methods, and possessed very high solubility in polar aprotic solvents. Copyright © 1992 Society of Chemical Industry