Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: POSTER: INTERNAL SYMPOSIUM Scattering Experiments
CPP 7.6: Poster
Monday, March 26, 2007, 16:00–18:00, Poster B
Formation of lateral structures in thin diblock copolymer films by vapor treatment — •Christine Papadakis1, Peter Černoch2, Charles Darko1, Ezz Metwalli1, Petr Štěpánek2, Detlef-M. Smilgies3, and Stephan V. Roth4 — 1Physikdepartment E13, TU München, James-Franck-Str. 1, 85747 Garching — 2Inst. Macromolecular Chemistry, Prague, Czech Republic — 3Cornell University, Ithaca NY, USA — 4HASYLAB at DESY, Hamburg
Diblock copolymers in the melt spontanously self-organize into mesoscopically ordered structures. In order to understand their response to changes of the environment, in-situ and real-time methods are of great value. We have performed grazing-incidence small-angle X-ray scattering (GISAXS) measurements on thin films of poly(4-octylstyrene-b-butyl methacrylate) (OB) and poly(4-octylstyrene-b-methyl methacrylate) (OM) before and after vapor treatment with different solvents. In the bulk, OB is lamellar, whereas OM forms connected struts [1]. The solvent quality and selectivity were found to have a strong influence on the inner film structure. Solvents which are poor for one block and good for the other block preferentially lead to the formation of lateral structures. Time-resolved in-situ GISAXS measurements allowed us to follow the formation of lateral structures in the vapor, giving insight into the time scales and the mechanisms involved.
1. P. Černoch, P. Štěpánek et al., Eur. Polym. J., accepted.