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SYPF: Struktur und Dynamik in dünnen Polymerfilmen

SYPF 2: Poster Session

SYPF 2.12: Poster

Donnerstag, 14. März 2002, 09:00–18:00, Poster B

Phase segregation in mixed polymer brushes — •Usov Denys¹, Sergiy Minko¹, Andreas Scholl¹, Christian Froeck², and Manfred Stamm¹ — ¹Institut fuer Polymerforschung Dresden e.V., Hohe Strasse 6, 01069 Dresden — ²Lawrence Berkeley National Laboratory, Berkeley, CA 94720, US

We investigate phase segregation in thin polymer films composed of two different types of polymer chains covalently bound to a substrate by end-functional groups. The grafting points are randomly distributed over the surface. Two polymers are incompatible and morphology of the film is governed by phase segregation at nanoscopic scale. We expose the mixed brush to solvents of different quality and study the film morphology with AFM and XPEEM. In a non-selective good solvent we observe a No-dqrippleNo-dq structure, in which the different polymers segregate into parallel cylinders. Upon exposure to a selective solvent the film switches to a No-dqdimpleNo-dq structure, in which the unfavored component form clusters. Simultaneously, we observe an enhanced segregation perpendicular to the surface.