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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 56: Molecular and Polymer Dynamics, Friction and Rheology I

CPP 56.3: Vortrag

Freitag, 13. März 2026, 11:30–11:45, HÜL/S386

Polymer melt dynamics in the light of viscoelastic hydrodynamic interaction — •Hendrik Meyer — Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, 67034 Strasbourg, France

Our group has shown that anomalous center-of-mass (CM) diffusion occurring on intermediate time scales in polymer melts can be explained by the interplay of viscoelastic and hydrodynamic interactions (VHI). The theory has been solved for unentangled melts in 3D [1] and 2D [2] and excellent agreement between theory and molecular dynamics simulation is found. The theory was developed for momentum conserving dynamics as well as Langevin dynamics. The physical mechanism considers that hydrodynamic interactions are time dependent because of increasing viscosity before the terminal relaxation time. We show that this mechanism is generally active and relevant in melts including entangled systems, rings or stars.

[1] PRL 107, 178301 (2011); PRE 85, 051807 (2012). [2] PRL 109, 248304 (2012); Soft Matter 9, 4249 (2013).