Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
SYSO: Symposium Self-organizing Surfaces and Interfaces
SYSO 3: Self-Organizing Surfaces and Interfaces - Posters
SYSO 3.12: Poster
Mittwoch, 25. März 2009, 17:30–19:30, P3
Formation of lateral structures in thin diblock copolymer films by vapor treatment — •Christine M. Papadakis1, Peter Černoch2, Petr Štěpánek2, Detlef-M. Smilgies3, and Stephan V. Roth4 — 1TU München, Physikdepartment E13, Garching — 2Inst. Macromolecular Chemistry, Prague, Czech Republic — 3CHESS, Cornell University, Ithaca NY, USA — 4HASYLAB at DESY, Hamburg
Exposure of block copolymer thin films to solvent vapor allows to control the orientation of the mesostructure with respect to the film surface. Using grazing-incidence small-angle X-ray scattering (GISAXS), we have investigated the structural changes in thin films of lamellae-forming poly(4-octylstyrene-b-butylmethacrylate) [1] before and after exposure to solvents of different qualities and selectivities and have found that the treatment with the strongly selective solvent acetone results in the parallel orientation, whereas the weakly selective solvent cyclohexane (CHX) leads to the formation of perpendicular lamellae, thus a laterally structured film. In-situ, real-time GISAXS during swelling with saturated CHX vapor revealed that the lamellar reorientation takes place within the first 15 min of the swelling. The film thickness nearly doubles. Upon drying, the lateral structure is preserved, i.e. treatment with this solvent constitutes an attractive opportunity to induce lateral structures in thin block copolymer films.
1. P. Černoch, P. Štěpánek et al., Eur. Polym. J. 43, 1144 (2007).