Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Polymer Networks and Elastomers I

CPP 5.7: Vortrag

Montag, 12. März 2018, 11:30–11:45, PC 203

Molecular properties and growth conditions associated with PSS diffusion during annealing in polyelectrolyte multilayers — •Annkatrin Sill, Amir Azinfar, Sven Neuber, Peter Nestler, and Christiane A. Helm — Inst. f. Physics, Greifswald University, Germany

During annealing of polyelectrolyte multilayers in concentrated solutions (1 M NaCl) interdiffusion of polyelectrolytes occurs. We investigate the interdiffusion perpendicular to the substrate using neutron reflectivity and selectively deuterated polyanions (poly(styrene sulfoante), PSS). Multilayers formed at 10 mM consist of flatly adsorbed chains. The diffusion constant of PSS can be tuned by five orders of magnitude; it decreases exponentially with the degree of polymerization of PDADMA (poly(diallyldimethylammonium)). Multilayers formed at 100 mM NaCl consist of interdigitated chains. When the degree of polymerization of PDADMA exceeds the one of PSS, the diffusion constant drops suddenly by three orders of magnitude and remains low. Such sudden transitions are better known from network than from polymer theory.