Correlation between the Adsorption of the Fluorocarbon Surfactants at the Polymer-Solution and Solution-Air Interfaces and the Parameter of the Interfacial Interaction

Using the literature data of the surface tension and contact angle of the fluorocarbon surfactants Zonyl FSN-100 (FSO100) and Zonyl FSO-100 (FSO100) on polytetrafluoroethylene (PTFE) and polymethyl methacrylate (PMMA), the values of the interfacial tension at the PTFE/PMMA-solution interface were calculated. Because of the possibility of the existence of the surfactant film on the PMMA surface, these calculations for PMMA were performed in two ways, that is with the assumption that the surface tension of PMMA is constant and that it is changed proportionally to the values of the surface tension of aqueous solution of surfactants. Next, the values of the Gibbs surface excess concentration, activity, and monomer mole fraction of the studied surfactants at the PTFE/PMMA-solution interface were determined and correlated with the Lucassen-Reynders equation. Also the values of the parameter of the interfacial interaction were calculated on the basis of the Girifalco and Good and Neumann et al. approaches.