Regensburg 2019 – wissenschaftliches Programm
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.