Speaker
Christina Geiger
(Frau)
Description
The diblock copolymer PMMA-b-PNIPAM in aqueous solution undergoes a reversible coil collapse transition at the lower critical solution temperature (LCST). This characteristic transition temperature can be tuned by the addition of organic co-nonsolvents such as ethanol or acetone. In order to investigate co-nonsolvency behavior in thin film geometry, we perform swelling experiments with a custom-made temperature-controlled vapor chamber. Complementary time-of-flight neutron reflectometry data and UV/Vis spectroscopic reflectometry data are used to access information about thickness and refractive index development, morphological changes, diffusion speeds and concentration gradients.
Primary authors
Christina Geiger
(Frau)
Dr
Cristiane Henschel
(Universität Potsdam)
Lucas Kreuzer
(TU München, Physik Department, E13)
Tobias Widmann
(TU München, Physik Department, LS Funktionelle Materialien)
Gaetano Mangiapia
(German Engineering Materials Science Centre (GEMS) am Heinz Maier-Leibnitz Zentrum (MLZ))
Volker Körstgens
(TU München)
Prof.
Andre Laschewsky
(Uni Potsdam, IAP Potsdam)
Christine Papadakis
(Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie)
Peter Müller-Buschbaum
(TU München, Physik-Department, LS Funktionelle Materialien)
