Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Charged Soft Matter, Polyelectrolytes and Ionic Liquids I

CPP 32.1: Vortrag

Mittwoch, 3. April 2019, 09:30–09:45, H13

Polyelectrolyte Multilayers from Binary Mixtures of Polyanions: Different Composition in Film and Solution — •Annekatrin Sill, Antonia Weltmeyer, Peter Nestler, Amir Azinfar, Malte Paßvogel, and Christiane A. Helm — Universität Greifswald, Institut für Physik, Felix-Hausdorff-Str. 6, 17489 Greifswald

Polyelectrolyte multilayers were prepared from polyanion PSS and polycation PDADMA in 0.1 M NaCl. PSS consisted of binary mixtures of heavy deuterated PSSd (Mw(PSSd) = 80.8 kDa) and light protonated PSS (Mw(PSS) = 10.6 kDa). With neutron reflectivity, it was found that the film contained a larger mole fraction PSSd than the deposition solution. If the mole fraction φPSSd(80.8 kDa) in the deposition solution exceeded 5 %, the multilayer consisted only of heavy PSSd. The time-resolved adsorption was studied with in-situ ellipsometry. Each polycation deposition step was followed by partial desorption of the top layer which is attributed to desorption of PDADMA complexed by light PSS molecules. These studies show that the polymer composition in the adsorption solution and in the adsorbed multilayer may differ.