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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.55: Poster

Tuesday, February 26, 2008, 14:30–20:00, Poster A

structural chances in thin block copolymer films during vapor treatment — •zhenyu di¹, christine papadakis¹, charles darko¹, dorthe posselt², and detlef-m smilgies³ — ¹Physikdepartment E13, TU München — ²Roskilde University, Denmark — ³Cornell University, USA

The mesoscopic structures formed by self-assembly of diblock copolymers in thin film geometry are interesting for a variety of applications. However, spin coating leads to domain structures with defects. Vapor treatment has been shown to be an effective way to increase the long-range order.

We have studied the structural changes in thin films of poly(styrene-b-butadiene) diblock copolymers and their kinetics during vapor treatment. In this system, the initial lamellar orientation (parallel or perpendicular to the substrate) can be controlled by the block copolymer molar mass [1]. We have investigated both initial orientations as well as the influence of the initial film thickness, solvent selectivity, and the vapor pressure using grazing-incidence small-angle x-ray scattering with a time resolution of a few sec. The growth of the lamellar domains can be controlled by the degree of swelling.

[1] P. Busch, D. Posselt, D.-M. Smilgies, C.M. Papadakis et al. Macromolecules 36, 8717 (2003) and Macromolecules 40, 630 (2007).