Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Interfaces and Thin Films I

CPP 1.13: Vortrag

Montag, 26. März 2012, 13:00–13:15, C 130

Stability and Orientations of Lamellae in Confined Block Copolymer Films — •Vanessa Weith, Alexei Krekhov, and Walter Zimmermann — Theoretische Physik I, Universität Bayreuth, 95440 Bayreuth, Germany

The study of self-assembly of block copolymers offers substantial opportunities to control the morphology of the evolving patterns. This is of considerable fundamental and technological importance for developing new materials to achieve specific properties.

Microphase separation in block copolymers is described by a two-dimensional mean-field model and its stationary, spatially periodic solutions are investigated for unconfined systems and for systems confined between two parallel boundaries having either equal or different wetting properties.

We determine the different stability and existence ranges of the periodic solutions in one and two spatial dimensions as well as the effects of confinement and of the block copolymer surface interaction on the free energy of lamellar solutions. This helps to determine which orientation of the lamellae is selected depending on the input parameters.

Furthermore the spatio-temporal behavior of the phase separation process of confined block copolymers is characterized.