Abstract
The properties of mixtures of poly (ethylene oxide) (PEO) and mixed micelles formed from sodium cholate (NaC) and sodium dodecyl sulfate (SDS) in tris/HCl buffered solutions at pH 9.00 were investigated by measuring the mean surface tension. The variation in the superficial tension as a function of the time after formation of solutions containing PEO and NaC was characterized by monitoring the time required for the system to reach equilibrium between the micellar and aqueous phases. These results could serve as a reference for the minimum aging time required for solutions before any surface tension measurements can be performed.
Highlights
The interactions between surfactants and neutral water-soluble polymers have been the focus of intense investigation over the last decade [1]-[8]
The dependence of the reduction of surface tension on time induced by a polymer molecule must involve a growth in the number of segments adsorbed at the interface per unit of area with time; the surface properties of a solution containing a polymer depend on the length and distribution of those segments
Kratohvil and collaborators [22] determined the aggregation number of 10 monomers per aggregate at concentrations near the cmc. They concluded that the formation of dimers occurred through hydrogen bonding and that, with an increase in concentration, aggregates grew through hydrophobic interactions between dimers
Summary
The interactions between surfactants and neutral water-soluble polymers have been the focus of intense investigation over the last decade [1]-[8]. The motivation for this research was identifying the physical-chemical properties of the solutions and any possible mechanisms that describe the bonding of the surfactant to the polymer. (2014) Determination of the Stabilization Time of the Solution-Air Interface for Aggregates Formed by NaC in Mixtures with SDS and PEO, Investigated by Dynamic Surface Tension Measurements. Many questions have been raised about the nature of the interaction stability between surfactants and polymers. Several factors have been proposed that may help identify the mechanisms and forces that drive the formation of these complexes [9]. The most “popular” interpretation refers to the hydrophobic character of both the surfactant and sections of the polymer chains [10]
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