Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 26: Poster: Charged Soft Matter, Polyelectrolytes, Ionic Liquids
CPP 26.4: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster B2
Combing polyelectrolyte brushes with polyelectrolyte multilayer: A neutron reflectivity study in humid conditions — •Oliver Löhmann1, Samantha Micculla1, Olaf Soldwedel2, and Regine von Klitzing1 — 1Technische Universität Berlin — 2Max Planck Institut für Festkörperforschung Stuttgart
Polyelectrolyte brushes and polyelectrolyte multilayer (PEM) are two powerful approaches to modify surfaces. Both have their advantages due to their different geometrical orientation and their different binding to the surface. A combination of both can favor special properties. The covalent binding of the polymer brush to surface can lead to a long stability. The diversity of PEM results in an enormous variety of stimuli responsive coatings. Here, a combination of the well-known PMETAC brush and PSS/PDADMAC PEM is investigated. Neutron reflectivity is used to get information about swelling behavior and the interdigitation while changing the humidity. Therefore, a contrast between the interface is generated by deuterating the PEM.
Here, we show the impact of humidity on the system. The combined system do not swell like the separate ones. The total system can be separated in two regimes: brush and PEM regime. The brush regime absorbs more water than the PEM regime but not as much as an uncoated brush. Additionally, the amount of PEM, which is diffused into the brush, can be calculated.