THERMAL-STABILITY OF ALIPHATIC POLYIMIDES

Results on the preparation and thermoanalytical investigation of aliph atic bismaleamic acids and bismaleimides are presented. Correlations w ere established between the chemical structure and the thermal propert ies. The melting point and the thermal stability of the bismaleimides decrease as the number of carbon atoms in the structure increases. Che mically imidized samples have significantly higher thermal stability, which is almost independent of the chemical structure. Thermal polymer ization begins just after the melting of the materials. A thermal frag mentation scheme is proposed, based on the results of mass spectrometr y.