SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Crystallization, Nucleation and Self-Assembly
CPP 19.7: Vortrag
Dienstag, 28. März 2023, 11:30–11:45, MER 02
New experimental setup to analyze structure formation in thermoplastic polymer melts — •Anna Katharina Sambale1, Eric Euchler1, Regine Boldt1, Kai Uhlig1, Laura Neumann1, Konrad Schneider1, 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 microstructure of semi-crystalline thermoplastics is significantly influenced by the processing procedure and its parameters. Inhomogeneous shear and extensional flow fields occurring during processing can cause constraints to the chain conformations, which in turn lead to altered crystallization behavior. Although the influence of crystallization kinetics on the properties of the most commonly used polymers is considered to be sufficiently known, (local) conditions and parameters in commercially used melt processing technologies are not fully understood. We recently started to develop a new experimental setup to study structure formation in polymers induced by melt processing. The first results on the crystallization processes in quiescent polymer melts under isothermal conditions investigated by X-ray scattering measurements will be presented. In particular, time- and temperature-dependent crystallization of polylactic acid (PLA) and isotactic polypropylene (iPP) with different crystallization rates were examined and proved the concept of the experimental setup.