Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Poster: Interfaces and Thin Films
CPP 14.13: Poster
Montag, 22. März 2010, 16:30–18:00, Poster C
Kinetics studies of lamellar poly(styrene-b-butadiene) diblock copolymer thin films during heat treatment — •Alessandro Sepe1, Zhenyu Di1, Tilo Hoppe1, David Magerl1, Jan Perlich4, Dorthe Posselt2, Detlef-M. Smilgies3, and Christine M. Papadakis1 — 1TU Munchen, Physikdepartment E13, Garching, Germany — 2Institute for Science, Systems and Models, Roskilde University, Denmark — 3Cornell High-Energy Synchrotron Source (CHESS), Ithaca, U.S.A. — 4HASYLAB at DESY, Hamburg
Nanostructured block copolymer thin films find a number of applications, especially as templates for anorganic materials, which may be used as optical elements or data storage devices. Thermal treatment has been applied to improve the orientation and the long-range order of the mesostructure.
We have studied thin films of lamellar poly(styrene-b-butadiene) (P(S-b-B)) diblock copolymers to elucidate the mechanisms of structural changes induced by thermal treatment and their kinetics. The lamellae initially have the perpendicular lamellar orientation. In-situ, real-time grazing-incidence small-angle X-ray scattering, as well as ex-situ atomic force microscopy and X-ray reflectometry were used. We found that the processes during thermal annealing strongly depend on the treatment temperature: Below the glass-transition temperature of the PS block, the perpendicular orientation is unchanged, whereas above, a more random lamellar orientation is observed and the film surface is flattened.