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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 42: Gels, Polymer Networks and Elastomers III

CPP 42.5: Talk

Thursday, March 21, 2024, 16:00–16:15, H 0106

Deformation-Induced Structure and Temperature Evolution of Natural Rubber — •Eric Euchler1, Konrad Schneider1, Anna Katharina Sambale1, Matthias Schwartzkopf2, and Sven Wießner1,31Leibniz-Institut für Polymerforschung, Dresden, Germany — 2Deutsches Elektronen Synchrotron DESY, Hamburg Germany — 3TUD Dresden University of Technology, Dresden, Germany

Natural Rubber (NR) vulcanizates show deformation-induced structure evolution, e.g. crystallization, explaining the outstanding mechanical performance in comparison to other elastomers. In this study, combined in situ experiments were realized by synchronizing wide-angle X-ray scattering (WAXS) and infrared (IR) thermography with the mechanical deformation of NR vulcanizates. Owing to the coupled methods, a unique database provides new insights into the mechanical behavior of NR, for example: (i) deformation-induced crystallization is primarily controlled by the mechanical stress; (ii) IR thermography allows to follow crystallization as a function of deformation; (iii) the onset of crystallization causes a rapid increase in temperature, however, only a slight increase in stress; (iv) deformation-induced crystallization shows a saturation plateau, which hardly changes with ongoing deformation; (v) surface temperatures show a certain fluctuation that may indicate a non-uniform crystallite distribution.

Keywords: in situ experiments; wide-angle X-ray scattering; infrared thermography; crystallization; natural rubber

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