Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 29: Polymerphysics I
CPP 29.9: Vortrag
Donnerstag, 28. Februar 2008, 11:45–12:00, C 130
Characterisation of structural changes during deformation and relaxation of semi-crystalline polymers by simultaneous online SAXS and WAXS measurements — •Konrad Schneider1, Andreas Schöne1, Andreas Timmann2, and Manfred Stamm1 — 1Leibniz Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, 01069 Dresden, Germany — 2DESY, Hasylab, Notkestr. 85, 22607 Hamburg, Germany
Time resolved small and wide 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 polyolefins 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. There are found changes on a scale of seconds during relaxation, while the structural changes during relaxation in the other regions are much less pronounced.