Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 29: Posters II

DY 29.23: Poster

Donnerstag, 29. März 2012, 17:00–19:00, Poster A

Probing anomalous diffusion in a polymer melt with a continuous-time random walk ansatz — •Julian Helfferich¹, Falko Ziebert², Hendrik Meyer², Alexander Blumen¹, and Jörg Baschnagel² — ¹Theoretical Polymer Physics, University of Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg, Germany — ²Institut Charles Sadron, Université de Strasbourg, CNRS, 23 rue du Loess, 67037 Strasbourg Cedex, France

Continuous time random walks (CTRW) have been repeatedly advanced for describing the dynamics of low-temperature polymer melts and binary mixtures. A CTRW picture allows for a systematic description of the long-time dynamics, averaging over the strongly correlated motions on small time- and length-scales; in this way it also serves in analysing the results of molecular dynamics (MD) simulations, allowing to determine the relevant parameters.

Using MD simulations we analyse the single particle trajectories, identify jumps and determine the waiting time and jump length distributions. Furthermore, based on tests for correlations, we determine the time- and length-scales on which the CTRW description is adequate.