Berlin 2024 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Crystallization, Nucleation and Self-Assembly I
CPP 3.4: Talk
Monday, March 18, 2024, 10:30–10:45, H 0110
New in situ X-ray experiments to investigate shear-induced crystallization effects in thermoplastics — •Anna Katharina Sambale1, Eric Euchler1, Kai Uhlig1, Regine Boldt1, Matthias Schwartzkopf2, Stephan Roth2,3, and Markus Stommel1,4 — 1Leibniz-Institut fuer Polymerforschung, Dresden, Germany — 2Deutsches Elektronen Synchrotron DESY, Hamburg, Germany — 3KTH Royal Institute of Technology, Stockholm, Sweden — 4Technical University Dresden, Dresden, Germany
The thermo-rheological conditions during the processing of semi-crystalline thermoplastics have a significant influence on their microstructure and, therefore, on the performance of the final product. During processing, inhomogeneous flow fields affect the polymer melt with different shear conditions, which significantly influence the crystallization behavior during cooling and solidification. Although studies have already been conducted on the crystallization behavior of polymer melts under shear, some interactions are still unknown, for example, the influence of (local) process conditions in commercial technologies, such as melt extrusion, on the crystallization behavior of polymorphic thermoplastics. To investigate such kind of interactions, a new experimental setup has been realized to investigate the structure formation of polymer melts in situ by synchrotron X-ray scattering. In this contribution, the first results are presented on the structure formation of iPP. Owing to the high temporal and spatial resolution, new insights into the shear-induced crystallization behavior of iPP under variations of the process parameters have been achieved.
Keywords: polymorphic thermoplastics; synchrotron radiation; shear-induced crystallization; polymer processing