Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Polymer Physics II

CPP 5.3: Vortrag

Montag, 26. März 2007, 15:00–15:15, H40

On the influence of excluded volume in polymer melts — •Hendrik Meyer, Joachim Wittmer, and Jörg Baschnagel — Institut Charles Sadron, CNRS, 67083 Strasbourg, France

Flory’s ideality hypothesis states that polymer chains in the melt have random walk like conformations as if there would be no excluded volume. However, it was shown recently that the excluded volume interaction induces corrections to scaling which are long range and which give rise to a power law decay of bond-bond correlation function [1] as well as to corrections to the Kratky plateau of the form factor [2]. In this presentation, we extend the study to dynamic quantities: The excluded volume potential is switched on gradually to study the crossover from phantom chains (representing perfect random walks described by the Rouse model) to real polymer melts. This gives evidence that subdiffusive behaviour found in contradiction to the Rouse model [3] is also caused by the excluded volume interaction.

[1] J. Wittmer, H. Meyer, J. Baschnagel et. al. Phys. Rev. Lett. 93 (2004) 147801.

[2] J. Wittmer et. al. cond-mat/0610359, cond-mat/0611322

[3] W. Paul, Chem. Phys. 284 (2002) 59.