Regensburg 2010 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 53: Nanostructured Materials IV
MM 53.4: Vortrag
Donnerstag, 25. März 2010, 14:45–15:00, H16
Simulation of the gyroid phase in copolymer systems — •Alexei Karatchentsev1, Wolfgang Dieterich2, Philipp Maass3, and Jens-Uwe Sommer1 — 1Leibniz-Institut für Polymerforschung, 01069 Dresden, Germany — 2Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 3Fachbereich Physik, Universität Osnabrück, 49069 Osnabrück, Germany
We employ a coarse-grained model to study the formation of
periodic continuous mesostructures in diblock and triblock copolymer
melts. Within this model, the blocks of the copolymer molecule are
mapped onto soft spheres with fluctuating radii of gyration and
the distance between the centers of the spheres [1]. The probability
distribution functions for these quantities as well as the monomer
number densities of the blocks are derived from the Gaussian chain model.
The kinetics of the mesophase segregation is driven by a Monte-Carlo
algorithm. First we explore in detail the gyroid phase observed
in the diblock copolymer system and discuss its stability. Then we
study the system of linear triblock copolymers and show how such
system can possibly increase the region of stability of the gyroid phase.
[1] F. Eurich, A. Karatchentsev, J. Baschnagel, W. Dieterich,
and
P. Maass J. Chem. Phys. 127, 134905 (2007)