Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 7: Interfaces and Thin Films (joint session CPP/DY)

DY 7.1: Vortrag

Montag, 1. April 2019, 15:00–15:15, H14

In situ GISAXS Investigations of Multi-responsive Block Copolymer Thin Films during Solvent Vapor Annealing — •Florian Jung¹, Panayiota A. Panteli², Detlef-M. Smilgies³, Dorthe Posselt⁴, Constantinos Tsitsilianis⁵, Costas S. Patrickios², and Christine M. Papadakis¹ — ¹Physics Department, Soft Matter Group, Technical University of Munich, Garching, Germany — ²Department of Chemistry, University of Cyprus, Nicosia, Cyprus — ³Wilson Laboratory, Cornell University, Ithaca, USA — ⁴Department of Science and Environment, Roskilde University, Roskilde, Denmark — ⁵Department of Chemical Engineering, University of Patras, Patras, Greece

In the present work, we investigate the structure of a pH and temperature responsive, CBABC type pentablock terpolymer in thin films during solvent vapor annealing (SVA) using grazing-incidence small-angle X-ray scattering. The C end blocks are statistical copolymers of the hydrophobic n-BuMA and the thermoresponsive TEGMA, the B blocks are the weak cationic polyelectrolyte PDMAEMA and the A block is the hydrophilic PEG. Films were prepared by spin coating from aqueous solutions of different pH values. SVA experiments were carried out using both water and toluene as solvents. Films prepared at low pH feature a spherical morphology, and swell strongly in water, but only weakly in toluene vapor. At high pH, no structural features are observed, indicating the importance of ionization for microphase separation. During swelling in toluene, a morphology of small spheres is observed in the swollen state, while water has no noticeable effect.