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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Poster Session II

CPP 25.23: Poster

Dienstag, 2. April 2019, 14:00–16:00, Poster B1

Co-nonsolvency induced self-organization of thermo-responsive block copolymers in thin films — •Christina Geiger¹, Cristiane Henschel², André Laschewsky², Christine M. Papadakis³, and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — ²Universität Potsdam, Institut für Chemie, Angewandte Polymerchemie, 14476 Potsdam — ³TU München, Physik-Department, Physik weicher Materie, 85748 Garching

PMMA-b-PNIPAM and PMMA-b-PNIPMAM in aqueous solution undergo a reversible shell collapse transition at the lower critical solution temperature (LCST), which can be moderated by gradually introducing organic solvents. In thin film configuration, this co-nonsolvency behavior makes them promising materials for vapor-sensitive nano-sensors and actuators. We prepare and examine thin films exhibiting various block ratios and subsequently perform swelling experiments in mixed vapor atmospheres. Morphological changes, as well as the kinetics of individual solvent and cosolvent diffusion into the films, concentration gradients and the development of thickness and refractive index are investigated with a focus on white light interferometry and in-situ TOF neutron reflectometry experiments.