On the relation of chemical structure and thermal properties of polyimides

The research explored the structural transformation in polyimides in a wide temperature range. To investigate the phase and relaxation transformations, we employed a combination of physical and chemical methods - thermal, thermogravimetry and thermomechanical analysis. We examined the possibilities of transformation in polyimides of different kinds and its manifestation depending on the structure of polymers (films and fibers). Moreover, we detected simultaneous behaviour of relaxation processes and phase rebuilding of the polymers. Based on the obtained experimental data, we calculated the thermal effects of the processes before imidization and examined their connection with temperatures of additional processing in a wide temperature range.

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