Dresden 2009 – wissenschaftliches Programm
CPP 11.9: Poster
Dienstag, 24. März 2009, 14:00–16:30, P3
Wetting and surface tension dynamics of aqueous anionic surfactant/cationic polyelectrolyte mixture — •V. Dutschk1, R. Slavchov1,2, B. Radoev2, G. Petzold1, and B. Breitzke3 — 1Leibniz Institute of Polymer Research Dresden, Germany — 2Faculty of Chemistry, University of Sofia, Bulgaria — 3Sasol Germany GmbH
It is well-known that the interaction between polyelectrolyte and surfactant starts at very low concentrations, therefore basic research is often carried out for low concentrations of surfactant solutions below the cmc.
Differences in the wetting kinetics depend on adsorption mechanisms. Modifying the highly hydrophobic polymer surfaces with solutions and mixtures allowed the conclusion that hydrophilisation of highly hydrophobic polymer surfaces occurs if modifying them with positively charged surfactant-polyelectrolyte mixtures (depending on the concentration of the both components). If the surfaces were modified with negatively charged mixtures, no change in the wettability of the Parafilm surface were observed. An essential conclusion is that the degree of wettability of a highly hydrophobic polymer surface with aqueous surfactant solutions and their mixtures can be assessed from the measurements of dynamic surface tensions. The corresponding isotherms of the surface tension and the contact angle show almost the same shape if the measuring points are recorded in non-equilibrium state at the same time.