Aromatic polyamides and polyimides of high molecular weight are currently under development by many industrial laboratories. Wire enamels, laminating and impregnating resins, and varnishes incorporating this new class of thermally stable polymers withstand higher operational temperatures than do most organic polymeric materials in use today. The thermal and oxidative stability of two of these resins has been investigated in air, in oxygen, and in O18-enriched oxygen over a temperature range of 300–400°C. The mechanism of degradation is postulated to be that of a unit by unit destruction of the polymer.
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Scala et al. (1965) studied this question.