Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Polymer Dynamics I

CPP 49.2: Vortrag

Donnerstag, 3. April 2014, 17:15–17:30, ZEU 260

Viscoelastic hydrodynamic interactions and anomalous CM diffusion in polymer melts — •Hendrik Meyer, A.N. Semenov, and Jean Farago — Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, France

We have recently discovered 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 simulation is found. 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).