Dec 8 – 10, 2020 Online only
Online event
Europe/Berlin timezone

Cononsolvency-Induced Collapse Transitions in Thin PMMA-b-PNIPAM and PMMA-b-PNIPMAM Films

Dec 9, 2020, 2:30 PM
3h 30m
Online event

Online event

Speaker

Julija Reitenbach (Technical University of Munich, Chair of Functional Materials)

Description

Stimuli responsive thin films combine the advantages of polymers in bulk, i.e., their increased stability and of polymer solutions, i.e., their fast response and therefore are attractive for a wide range of applications. Towards future applications, we investigate the not yet well understood phenomenon of cononsolvency. For this we prepared thin films of the thermoresponsive diblock copolymers PMMA-b-PNIPAM and PMMA-b-PNIPMAM which exhibit cononsolvency induced collapse transitions when organic cosolvents, like acetone or methanol, are introduced into the surrounding atmosphere. The chemical structures of NIPAM (N-isopropylacrylamide) and NIPMAM (N-isopropylmethacrylamide) differ by an additional methyl group, which is able to influence the film collapse kinetics on a macroscopic scale. The macroscopic changes during the swelling and collapse transitions were investigated by spectral reflectance (SR) and verified through time-of-flight neutron reflectometry (ToF-NR) measurements. On a more molecular level we further elucidate the underlying mechanism by in situ Fourier-transform infrared spectroscopy (FTIR) measurements to gain further insight into the origin of the cononsolvency effect.

Primary author

Julija Reitenbach (Technical University of Munich, Chair of Functional Materials)

Co-authors

Christina Geiger (Technical University of Munich, Chair of Functional Materials) Lucas Kreuzer (TU München, Physik Department, E13) Tobias Widmann (TU München, Physik Department, LS Funktionelle Materialien) Peixi Wang (Workgroup Polymer Interfaces, TUM Department of Physics, Technical University of Munich) Gaetano Mangiapia (German Engineering Materials Science Centre (GEMS) am Heinz Maier-Leibnitz Zentrum (MLZ)) Cristiane Henschel (Universität Potsdam) Prof. André Laschewsky (Universität Potsdam, Institut für Chemie) Christine Papadakis (Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie) Peter Müller-Buschbaum (TU München, Physik-Department, LS Funktionelle Materialien)

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