Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 67: Polymer and Molecular Dynamics, Friction and Rheology

CPP 67.3: Vortrag

Freitag, 5. April 2019, 10:15–10:30, H13

Rheology of Nonequilibrium Polymer Melts — •Manjesh K. Singh, Hsiao-Ping Hsu, and Kurt Kremer — Max Planck Institute for Polymer Research, Mainz, Germany

Polymers have become very popular in everyday use because of ease in processing of polymeric materials. Polymers are processed to different complex shapes from the molten state. Polymer melts display rich viscoelastic behavior in the typical length and time scales. The processing of polymer melts become difficult with increase in molecular weight (Mw) because of increase in viscosity. The long polymer chains in a melt have to move in a specific way due to the topological constraints "entanglements" imposed by neighboring chains. This happens because of the fact that the in a polymeric systems each monomers are connected to their neighboring monomers and can not crossover each other. Increase in number of entanglements with increase in Mw leads to increase in viscosity.

We have used complementary experimental and simulation approaches to study the development of entanglements in a fully disentangled melt of collapsed polymer chains and changes in viscosity, moduli and glass-transition temperature during the process.