Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Poster: Interfaces and Thin Films
CPP 13.14: Poster
Dienstag, 27. März 2012, 18:15–20:45, Poster A
Phase diagram of a diblock copolymer film in an electric field in the strong segregation limit — •Michael Harrach1, Marianne Heckmann1, Tiago Peixoto2, and Barbara Drossel1 — 1Institut für Festkörperphysik, TU Darmstadt — 2Institut für Theoretische Physik, Universität Bremen
We obtain phase diagrams for a thin film of diblock copolymers in an electric field at low temperatures in the strong-segregation limit. In this limit, the system consists of pure A and B domains, and the contributions to the free energy are due to interfacial and polymer stretching effects. We assign different dielectric constants to the two types of domains and evaluate the free energy for different types of phases that are composed of lamellar and cylindrical components, which may be deformed. We consider a two-dimensional system, assuming translational invariance in the third dimension, and periodic boundary conditions in the direction parallel to the condensator plates, between which the polymer film is confined. Specific three dimensional morphologies are considered as well. Phase diagrams are shown as function of film thickness and electric field. Results are presented for a ratio of permittivites of 1:5, for three volume fractions of monomers and four differing field strengths.