Berlin 2001 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 19: Poster: New Methods, Thin Polymer Films, Monolayers
CPP 19.21: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT1
Cross-over from dewetting and wetting examined in thin polymer bilayer films — •O. Wunnicke1, P. Müller-Buschbaum2, and M. Stamm1 — 1Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden — 2TU München Physik Department LS E13, James-Franck-Str.1, 85747 Garching
Utilizing the spin-coating technique it is possible to prepare thin polymer films even on non-wetable surfaces. We examined thin bilayer films of polystryene (PS) on top of polyamide (PA) layers [1]. The thickness of the PS layer was kept constant and the thickness of the PA layer was varied. Due to the thickness dependence of the effective Hamaker constant, the wetting properties of the underlying PA layer change [2]. While PS is stable on thinner PA layers, PS films dewet on thicker PA layers. This cross-over in the wetability from the dewetting into the wetting regime is studied by optical microscopy, scanning force microscopy, optical phase interference microscopy and X-ray specular and off-specular scattering [3].
[1] C. Renger, P. Müller-Buschbaum, M. Stamm, G. Hinrichsen; Macromolecules 33, 8388 (2000)
[2] A. Sharma, G. Reiter; J. Colloid Interface Sci. 178, 383 (1996)
[3] P. Müller-Buschbaum, P. Vanhoorne, V. Scheumann, M. Stamm; Europhys. Lett. 40, 665 (1997)