Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Poster: Polymer Dynamics

CPP 31.7: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster C

Permeation of a polymer chain through nanopores -- timescales and mechanism — •Sara Marleen Hellenkamp, Andreas Heuer, and Monika Schönhoff — Institute of Physical Chemistry, University of Münster, Corrensstr. 28/30, 48149 Münster, Germany

We investigate the permeation of polymers through the nanoporous wall of hollow capsules, in particular the correlation between polymer molecular weight and exchange time. In a previously analysed system consisting of polyelectrolyte multilayer capsules and poly(ethylene glycol) as probe molecules two scaling regimes were identified [1]. In a theoretical study, a scaling law was derived and confirmed by Monte Carlo simulations, where the polymer is represented as a Rouse chain [2].

In the present study, we combine experiments of chain permeation by diffusion time dependent Pulsed Field Gradient NMR diffusion studies with Monte Carlo Simulation of a polymer chain threaded through a nanopore. The simulations are a first step to understand the whole mechanism of polymer permeation through a nanopore. We investigate the correlation between the exchange time and several parameters, in particularly the chain length and the wall thickness. The final goal of this study is to identify general laws governing chain permeation.

[1] R. Choudhury, P. Galvosas, M. Schönhoff, J. Phys. Chem. (2008)

[2] J. L. A. Dubbeldam, A. Milchev, V.G. Rostiashvili, T.A. Vilgis, Cond. Mat. (2007)