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Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: New Instruments and Methods

CPP 28.6: Talk

Tuesday, March 17, 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 Marcus21Leibniz-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.

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