Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 29: POSTER: Polymer physics

CPP 29.15: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Temperature and thickness regulated domain spacings in thin films of a cylinder forming diblock copolymer — •Larissa Tsarkova, Armin Knoll, Robert Magerle und Georg Krausch — Physikalische Chemie II, Universität Bayreuth

Recent research on thin films of asymmetric block copolymers has demonstrated deviations from the bulk behavior due to confinement and surface field effects [1]. With scanning force microscopy (SFM) we study the phase behavior in thin films of a polystyrene-block-polybutadiene copolymer. Long range microdomain ordering as well as terrace formation was achieved by thermal annealing in vacuum. With the home made software [2] performing quantitaive processing of SFM images we analyze the cylinder spacings within the terraces and at transition film thickness (steps). We demonstrate systematic changes in the lateral domain spacing induced by a variation of the annealing temperature and the film thickness. Both results suggest novel routes to tune and control the microdomain dimensions on a nanometer scale without changing the composition of the polymer film. [1] A. Knoll, et al., PRL, 89, 035501 (2002).[2] A. Knoll, Ph.D. Thesis, Universität Bayreuth, Germany (2003).