Abstract
The mechanical behaviour of a copolymer, consisting of ethylene, tetrafluoroethylene, hexafluoropropylene and perfluoropropylvinylether, unfilled and filled with short glass fibres has been investigated for strains less than 5%. Different deformation modes at room temperature and at 80 °C were recorded with a video system. The resulting stress-strain, relaxation and shrinkage curves are described with a model consisting of seven basic rheological elements of three different types: spring (Hooke model), dashpot (Newton model) and slip-element (St. Venant model). This seven-element model gives a very good approximation of all the investigated deformation modes and allows an interpretation of relaxation and retardation times of polymer segments. The plastic deformation, described by the slip-element, is assumed to be caused by slip processes in the highly disordered crystallites of the copolymer matrix.
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