Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.35: Poster

Monday, September 5, 2022, 18:00–20:00, P1

Tunable morphologies in charged multiblock terpolymers in thin film geometry: effect of solvent vapor annealing — •Bahar Yazdanshenas¹, Florian A. Jung¹, Maximilian Schart¹, Constantinos Tsitsilianis², and Christine M. Papadakis¹ — ¹Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie, Garching, Germany — ²University of Patras, Department of Chemical Engineering, Patras, Greece

Thin films of a pentablock terpolymer with a symmetric architecture of two types of pH-responsive midblocks and short hydrophobic end blocks are investigated. As-prepared spin-coated films from different pH-values have previously shown highly tunable and non-monotonous behavior of the lateral structure sizes, based on the charge [1]. However, with the high glass transition temperatures of the middle pH-responsive block and the hydrophobic end blocks, the films were not necessarily in equilibrium. Here, we investigate further accessible morphologies by swelling the films in the vapors of solvents having different selectivity. Results from spectral reflectance and atomic force microscopy suggest that water (exclusively swelling the pH-responsive blocks) leaves the nanostructures intact, while methanol (swelling all blocks) results in a reorganization. Mixtures of these vapors allow to tune the solubilities of the blocks and thus to find the minimum amount of methanol needed for equilibration.

[1] F. A. Jung, C. M. Papadakis et al., Adv. Funct. Mater. 2021, 31, 2102905.