Dec 8 – 9, 2022
Marriott
Europe/Berlin timezone

Tunable morphologies in charged pentablock terpolymers in thin film geometry: effect of solvent vapor annealing

Dec 9, 2022, 2:00 PM
3h
Marriott

Marriott

Board: P-048
Poster Soft Matter Poster Session

Speaker

Ms Bahar Yazdanshenas (Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München)

Description

Self-assembled morphologies of thin films of a pentablock terpolymer with a symmetric architecture of two types of pH-responsive midblocks and short hydrophobic end blocks are investigated. Different degrees of charge, installed for the two pH-responsive blocks by varying the pH-value of the aqueous solution used for spin-coating, strongly define the film formation behaviour [1]. However, with the high glass transition temperatures of the middle pH-responsive block and the hydrophobic end blocks, the as-prepared films are not necessarily in equilibrium. Here, we investigate further accessible morphologies by swelling the films in the vapors of solvents having different selectivity. In situ grazing-incidence small-angle X-ray scattering (GISAXS) suggests that water vapour (exclusively swelling the pH-responsive blocks) disorders the film in the swollen state, while it leaves the nanodomains rather intact after drying. Methanol vapor (swelling all blocks), in contrast, enhances microphase separation, and the film stays ordered at all stages of SVA. Restructurization, in general, was found to be more pronounced at higher pH-values, where both pH-responsive blocks are uncharged.

[1] F. A. Jung, M. Schart, L. Bührend, E. Meidinger, J.-J. Kang, B.-J. Niebuur, S. Ariaee, D. S. Molodenskiy, D. Posselt, H. Amenitsch, C. Tsitsilianis, and C. M. Papadakis, Adv. Funct. Mater. 31, 2102905 (2021).

Primary author

Ms Bahar Yazdanshenas (Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München)

Co-authors

Dr Florian Jung (Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München) Mr Sina Ariaee (Department of Science and Environment Roskilde University) Prof. Dorthe Posselt (Department of Science and Environment Roskilde University) Prof. Heinz Amenitsch (Institute of Inorganic Chemistry, Graz University of Technology) Prof. Constantinos Tsitsilianis (Department of Chemical Engineering University of Patras) Christine Papadakis (Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie)

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