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    Influence of NaCl on the Behavior of PEO-PPO-PEO Triblock Copolymers in Solution, at Interfaces, and in Asymmetric Liquid Films

    Year: 2005

    Journal: Langmuir 2005, 21, 4954-4963, 20111221

    Authors: O. V. Elisseeva, N. A. M. Besseling, L. K. Koopal, and M. A. Cohen Stuart

    Organizations: Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6702 HB Wageningen, The Netherlands

    The solution behavior of the polymeric surfactant Pluronic F127 (PEO99PPO65PEO99) and its adsorption behavior on aqueous-silica and aqueous-air interfaces, as well as the disjoining pressure isotherms of asymmetric films (silica/aqueous film/air) containing F127, are studied.Theinterfacial properties of adsorbed F127 layers (the adsorbed amount gamma and the thickness h) as well as the aqueous wetting film properties [film thickness (h) and refractive indexes] were studied via ellipsometry. The solution properties of F127 were investigated using surface tensiometry and light scattering. The interactions between the air-water andsilica-water interfaces were measured with a thin film pressure balance technique (TFB)andinterpreted in terms of disjoining pressure as a function of the film thickness. The relations between the behaviors of the asymmetric films, adsorption at aqueous air, and aqueous silica interfaces and the solution behavior of the polymeric surfactant are discussed. Special attention is paid to the influence of the concentrations of F127 and NaCl. Addition of electrolyte lowers the critical micelle concentration, diminishes adsorption on silica, and increases the thickness of the asymmetric film.