Abstract
AbstractUnder conditions of high temperature, polyimides and their prepolymers undergo a number of chemical transformations, the most part of which relate to reaction of polycondensation. New aspects of thermal cyclodehydration in the presence of heteroaromatic compounds used as stereospecific catalysts were studied. The mechanism of thermal decarboxylation and decarbonylation of polyimides under conditions of heating in inert and self‐generating atmosphere was ascertained. A study of the polycondensation processes leading to the formation of ordered domains in polyconjugated products of high temperature thermolysis was carried out. The principal parameters of the thermochemical transformation of the polyimide structure depending on the chemical nature of the polyimide unit were determined by means of the kinetics of the structural changes of the basic fragments of polyimide series. The role of nitrogen atoms in the formation of the turbo‐straticulate centres in the products of polyimide thermolysis is discussed.
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