Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: New Instruments and Methods
CPP 28.6: Vortrag
Dienstag, 17. März 2015, 15:15–15:30, C 264
Characterization of deformation and fracture behaviour of semi-crystalline polymers by thermography with high lateral and time resolution — •Schneider Konrad1 and Stein Marcus2 — 1Leibniz-Institut für Polymerforschung Dresden, Dresden, Germany — 2Technische Universität Dresden, Fakultät Maschinenwesen, Institut für Verarbeitungsmaschinen und Mobile Arbeitsmaschinen, Germany
Plastic deformation during yielding and stretching as well as fracture propagation in semi-crystalline polymers dissipates a considerable amount of energy. This leads to a local temperature increase, connected with a change of local molecular mobility. By infrared thermography with high lateral and time resolution these changes can be quantified. With measurements on Poly(ethylene terephthalate) (PET) as well as Polycarbonate (PC) it will be demonstrated, how locally the glass transition temperature can be exceeded and how the deformation process in detail is affected by the really appeared temperature. Also the appearance of cavitation will be mainly affected by the thermal fields in the necking zone. Finally the strongly located energy dissipation during fracture will be presented and discussed in detail. This discussion shall throw a new light on the relevant molecular rearranging processes.