Formation of polyimide from benzophenonetetracarboxylic acid diester complexes with different diamines. 4. Gas-chromatographic study of thermal cyclization of complexes
摘要:
Thermal cyclization of H complexes is characterized by one rate constant which significantly distinguishes it from thermal cyclization of polyamido acids. The degree of completion of thermal cyclization of the H complex and its rate are determined by diffusion processes related to the structure of the H complex and mobility (softening) of the system during thermal cyclization.