Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 52: Poster: Hydogels, Microgels, Responsive Polymers
CPP 52.1: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
H2O - D2O exchange kinetics in PNIPAM based block copolymer films followed with in-situ neutron reflectivity — •Lucas Kreuzer1, Tobias Widmann1, Nuri Hohn1, Kun Wang1, Jean-Francois Moulin2, Viet Hildebrand3, André Laschewsky3, Christine Papadakis1, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2HZG at MLZ, Lichtenbergstr. 1, 85748 Garching — 3Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm
Responsive polymers, especially in thin film morphology, are of great interest for a wide variety of applications where a strong change of volume is desired even for small changes of an external stimulus such as temperature. In this context the most prominent representative is poly(N isopropylacrylamide) (PNIPAM). We study a new block copolymer which comprises a PNIPAM block and a poly(sulfobetaine) (PSB) block. Thin films are prepared by spin coating on silicon substrates. We have followed the swelling of such films in water vapor atmosphere and found signature of H2O - D2O exchange in FT-IR data. We use neutron reflectivity to study the swelling behavior and the H2O - D2O exchange of PNIPAM-b-PSB films in more detail. In-situ neutron reflectometry enables to follow the kinetics and determine the underlying fundamental processes.