Abstract
A complex of physico-chemical processes taking place in polyamic acids of different chemical structure during thermal ring formation in solid state, were examined. It was shown that the absolute degree of polyamic acid breakdown varies between 1 and 6–8%, according to chemical structure. Anhydride end groups formed during the breakdown of polyamic acids may at increased temperature (⩾200°C) be resynthesized. At T>300° anhydride rings break down, resulting in crosslinking of PI. Possible reactions of crosslinking are proposed.
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