Characteristic Features of Relaxation Processes in Thermoplastic Heat-Resistant Polymers Related to their Structure
Keywords:
heat–resistant polymer, stress relaxation, glassy-state transition, relaxation ss-transition, morphology, X-ray diffraction.Abstract
The article presents an analysis of structure-property relations of thermoplastic heat-resistant polymers (HRP) polyimides and polybenzoxazole evaluating stress relaxation conditions. The main characteristic features of mechanical behavior of HRP, such as very high glass transition temperatures (250 – 500 °C) and existence of relaxation ss-transitions (solid-solid transitions) were considered in comparison to peculiarities of their chemical structure and morphology. The influence of of hinge-type groups in polymer macromolecules on glass transition and relaxation transition temperatures was assessed.
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