Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: POSTER: INTERNAL SYMPOSIUM Scattering Experiments
CPP 7.21: Poster
Montag, 26. März 2007, 16:00–18:00, Poster B
Characterisation of structural changes during deformation and relaxation of semi-crystalline polymers by SAXS — •Konrad Schneider1 and Peter Bösecke2 — 1Leibniz-Institut für Polymerforschung Dresden, Hohe Str. 6, 01069 Dresden — 2European Synchrotron Radiation Facility (ESRF), BP 220, F38043 Grenoble, France
Time resolved small angle x-ray scattering using synchrotron radiation allows to follow up structural changes during deformation and relaxation of semi-crystalline polymers. On the example of polypropylene as well as high-density polyethylene copolymers the changes of the structure in the crystalline and in the amorphous domains were followed during the three characteristic stages of the load-displacement curves: The elastic stage and the plastic range composed of the stage of the lowering load in the force-displacement-curve (yielding) and the strain hardening. It is found that most rigorous changes are observed during yielding, whereas changes on a scale of second during relaxation are more pronounced than during the loading steps.