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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 Sommer11Leibniz-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)

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