Regensburg 2019 – wissenschaftliches Programm
CPP 8.1: 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.