Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster: Charged Soft Matter
CPP 22.5: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
On the internal structure of polyelectrolyte multilayers — •Malte Paßvogel1, Peter Nestler1, Olaf Soltwedel2, Ralf Köhler3, and Christiane A. Helm1 — 1Institut für Physik, Uni Greifswald, Felix-Hausdorff-Str. 6, 17487 Greifswald, Germany — 2FRM II, Lichtenbergstr. 1, 85747 Garching, Germany — 3Stranski-Lab, TU Berlin, 10623 Berlin; Institut F-I2, HZB Berlin, 14109 Berlin, Germany
Polyelectrolyte multilayers from PSS and PDADMAC formed in 0.1 M NaCl solution are investigated. With in-situ ellipsometry first exponential, then linear growth is observed. In the linear growth regime, with increasing PDADMAC molecular weight the thickness per deposited PDADMAC layer and thus the thickness per PDADMA/PSS layer pair increase for PDADMAC polymer weight below 100 kDa, then they level off. Qualitatively, the same results are obtained with X-ray reflectivity from films formed with a different number of PSS/PDADMA layer pairs. However, quantitative comparison shows that films in the exponential growth regime shrink much more on drying (ca 55 %) than the thicker films in the linear growth regime (35 %). With neutron reflectivity the position and width of an internal interface between protonated and deuterated blocks is determined. While the position of the internal interface does not move after deposition, the width increases due to interdiffusion. It is smallest next to the film/air interface and increases towards the core zone of the film until an equilibrium value is reached.