Abstract
The emergence of free radicals of polyconjugated systems (PCS) in the thermal and thermooxidative degradation of polyamidoimide films was observed in the temperature range 553–673°K. According to the ESR spectra these radicals are practically identical in character. The rate of accumulation and the limit concentrations of these PCS radicals are significantly higher in the thermal oxidation as compared with thermal degradation processes. This is attributable to a difference in the rates of formation of isoimide rings and in their limit concentrations in these processes. In the case of thermal oxidation the kinetic curves of accumulation of PCS radicals are described by a model of kinetic nonequivalence of reactive centres in solidphase radical reactions. Effective rate constants and activation energies have been determined for the accumulation of PCS radicals during the thermal oxidation.
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