Abstract
By the action of a temperature field of force a highly oriented crystalline structure could be obtained for four polymers prepared from pyromellitic acid dianhydride and unable to crystallize during imidization by heat. Results are given of a study of the structure and mechanical properties of fibres of this group of polymers. It was shown that, in contrast to pyromellitimide (PM), diamine fragments and not dianhydride fragments are responsible for intermolecular packing of chains. It was assumed that increasing the cross section of the diamine fragment of the recurrent unit, compared with the dianhydride one, weakens intermolecular contacts in the dianhydride layer and is the main cause of noticeably poorer mechanical properties of polymers, compared with similar properties of PM.
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