Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: POSTERS Rheology

CPP 7.12: Poster

Montag, 25. Februar 2008, 16:45–19:00, Poster A

Time evolution of surface relief structures in thin block copolymer films — •Andriana Horvat¹, Larisa Tsarkova¹, Agur Sevink², Andrey Zvelindovsky³, Robert Magerle⁴, and Armin Knoll⁵ — ¹Physikalische Chemie II, Universität Bayreuth, Germany — ²Soft Condensed Matter Group, Leiden Institute of Chemistry, Leiden University, The Netherlands — ³Centre for Materials Science, Department of Physics, Astronomy and Mathematics, University of Central Lancashire, Preston, United Kingdom — ⁴Chemische Physik, Technische Universität Chemnitz, Germany — ⁵IBM Research GmbH, Sumerstrasse 4, Rüschlikon, Switzerland

The dynamics of early stage of terrace formation in thin supported films of cylinder forming triblock copolymers was studied both theoretically using self-consistent field theory (DSCFT) and experimentally by in-situ scanning force microscopy (SFM). In experiment, an initially flat film of incommensurable thickness was imaged continuously, and the evolution of vertical orientation of cylinders into parallel one, as well as the respective development of thickness gradient (terrace formation) was captured in detail. On the grounds of these experimental observations, the parameters of the computational model A₃B₁₂A₃ were determined to match the structures in experiment. Both systems show excellent agreement in details of structural phase transitions and in the dynamics of the step development, suggesting that the underlying transport mechanisms are governed by diffusion.