Low-temperature carbonization of polyimides

The early stage of carbonization of the industrial polyimide film based on pyromellitimide was studied under various high-temperature operating condit ions. The mechanisms of intramolecular and intermolecular thermochemical re actions of polyimide structures and the products of their degradation were studied by spectral and thermal analyses. The materials-science characteris tics of polyimide carbonizates, practically important for high-temperature operation of polypyromellitimide films and fibers, were determined.