Speaker
Christina Geiger
(Technical University of Munich, Chair of Functional Materials)
Description
After exposure to mixed water/cosolvent vapor, hydrated thin films of stimuli-responsive block copolymers with PNIPAM or PNIPMAM blocks exhibit a co-nonsolvency behavior. In a rapid film contraction, in either system, both water and cosolvent are expelled. Film swelling and contraction kinetics from saturated vapor are investigated in time-of-flight neutron reflectometry (ToF-NR) with simultaneous spectral reflectance (SR). Molecular interactions of the solvent with the respective polymer chains are analyzed with Fourier-transform infrared (FTIR) spectroscopy. The response kinetics are found to be dependent on the solvation potential of specific functional groups.
Primary author
Christina Geiger
(Technical University of Munich, Chair of Functional Materials)
Co-authors
Julija Reitenbach
Peixi Wang
(Workgroup Polymer Interfaces, TUM Department of Physics, Technical University of Munich)
Ms
Cristiane Henschel
(Institut für Chemie, Universität Potsdam, 14476 Potsdam-Golm, Germany)
Gaetano Mangiapia
(German Engineering Materials Science Centre (GEMS) am Heinz Maier-Leibnitz Zentrum (MLZ))
Jean-Francois Moulin
(Hereon)
André Laschewsky
Christine Papadakis
(Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie)
Peter Müller-Buschbaum
(1 Technische Universität München, Fakultät für Physik, Lehrstuhl für Funktionelle Materialien, James-Franck-Str.1, 85748 Garching, Germany 2 Heinz Maier-Leibnitz-Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany)
