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CPP: Chemische Physik und Polymerphysik

CPP 15: POSTER: Polymers and Biomaterials

CPP 15.28: Poster

Dienstag, 9. März 2004, 17:00–19:00, B

Soft particle model for block-copolymer systems — •Alexei Karatchentsev¹, Frank Eurich¹, Wolfgang Dieterich¹, and Philipp Maass² — ¹Fachbereich Physik, Universität Konstanz, Germany — ²Institut für Physik, Technische Universität Ilmenau, Germany

We extend earlier work on the Gaussian ellipsoid model for homopolymers [1,2] to diblock copolymers by developing a soft disphere model. In this model diblock copolymers are described as two spheres connected by an effective bond potential. The radii of the spheres and the monomer densities within the spheres are derived from the Gaussian chain model. By means of Monte-Carlo simulations we explore the complex phase diagram of microphase segregation for the disphere model and compare our results with experimental phase diagrams and with those obtained from self-consistent field theory. In particular we discuss the scaling of characteristic domain sizes with respect to the Flory-Huggins parameter and the chain length. Furthermore we show how the kinetics of microphase ordering can be studied on large time and length scales, where entanglement effects are negligible.
[1] F. Eurich and P. Maass, J. Chem. Phys. 114, 7655 (2001).
[2] F. Eurich, P. Maass, and J. Baschnagel, J. Chem. Phys. 117, 4564 (2002).