Sonderforschungsbereich 481

    Komplexe Makromolekül- und Hybridsysteme in inneren und äußeren Feldern

Horvath, A; Knoll, A.; Krausch, G.; Tsarkova, L.; Lyakhova, K.S.; Sevink, G.; Zvelindovsky, A.V.; Magerle, R.: Time Evolution of Surface Relief Structures in Thin Block Copolymer Films, Macromolecules, 40(19), 6930–6939 (2007), doi:10.1021/ma071107a
Abstract:
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. The simulation A3B12A3 model was parametrized to reproduce 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. The early stage of terrace formation are characterized by the development of the step height up to ~80% of its equilibrium value and associated reorientation of cylindrical domains.

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