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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session 2

CPP 37.36: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P3

Complex macrophase separated nanostructure induced by microphase separation in lamellar diblock copolymer thin films — Jianqi Zhang¹, Dorthe Posselt², Konstantinos Kyriakos¹, Sebastian Jaksch¹, Jan Perlich³, Detlef-M. Smilgies⁴, and •Christine M. Papadakis¹ — ¹TU München, Physik-Department, Garching — ²IMFUFA, Roskilde University, Denmark — ³DESY, Hamburg — ⁴Cornell University, Ithaca, NY, USA

Complex, macrophase-separated structures in thin films may be prepared from binary blends of diblock copolymers. We have investigated the nanostructures of thin films spin-coated from binary blends of compositionally symmetric poly(styrene-b-butadiene) (P(S-b-B)) diblock copolymers having different molar masses using atomic force microscopy (AFM) and grazing-incidence small-angle X-ray scattering (GISAXS) after spin-coating and after subsequent solvent vapor annealing. The as-prepared thin films from these binary blends feature mainly perpendicular lamellae in the one-phase state, indicating that the higher molar mass diblock copolymers dominate the lamellar orientation. The lamellar thickness decreases linearly with increasing volume fraction of the low molar mass diblock copolymer. After solvent vapor annealing, well-defined macrophase separated nanostructures appear which feature parallel lamellae near the film surface and perpendicular ones in the bulk.