Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.50: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Thermoresponsive switching behavior in thin films of cyclic and linear PNIPAM — •David Magerl1, Xing-Ping Qiu2, Françoise M. Winnik2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2Université de Montréal, Faculty of Pharmacy and Department of Chemistry, CP 6128 Succursale Centre Ville Montréal QC H3C 3J7, Canada
Stimuli-responsive hydrogels are a widely studied field of polymers with a huge potential of applications such as drug-delivery systems and sensors. Among this type of polymer PNIPAM is a well-known representative as a model system of a thermo-responsive polymer. It has been shown by comparative studies of linear and cyclic PNIPAM that a cyclic topography of the polymer greatly influences the switching behavior [1].Within the scope of this study the properties of spin-coated thin films of linear and cyclic PNIPAM with well-defined molecular weights and different film thicknesses are investigated. Film swelling, when exposed to water vapor, and the switching behavior under a thermal stimulus is investigated. Due to the confinement by the substrate no uniform (3D) swelling but a 1D swelling that results in a thickness change of the films is observed by white-light interferometry and further analyzed.
[1] X.-P. Qiu, F. Tanaka, and F.M. Winnik, Macromolecules 2007, 40, 7069 - 7071