Polyimides were synthesised from a number of diamines and dianhydrides and their stability determined by thermogravimetric analysis at 400°C in air. Wherever possible high molecular weight films obtained by thermal condensation of the polyamic acid intermediates were studied. If this was not possible, films obtained from acetic acid anhydride ciclised polymers or thermally cured powders were used. A well defiend order of stability was observed for the polyimides prepared from pyromellitic dianhydride and a variety of diamines. The simplest and most symmetrical structures had the greatest thermal stability. Lowest stabilities were observed when linking groups were electronegative in nature.
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Dine‐Hart et al. (1972) studied this question.
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