Heat capacities and volumes in aqueous polymer and polymer–surfactant solutions

Abstract

. Can. J. Chem. 65, 990 (1987). The apparent molar volumes and heat capacities of aqueous mixtures of neutral polymers and ionic surfactants were measured at 25°C. The polymers chosen were poly(vinylpyrrolidone) (PVP) and poly(ethy1eneoxide) (PEO) and the surfactants were the C8, Clo, and C I 2 homologs of sodium alkylsulfates and the C l o , C12, and C16 homologs of alkyltrimethylammonium bromides. The polymer-surfactant interactions depend on the nature of both components and on the chain length of the surfactant. The thermodynamic properties of the cationic surfactants are essentially the same in the absence and presence of polymer indicating little surfactant-polymer interaction. On the other hand, the thermodynamic properties of anionic surfactants are shifted, upon the addition of polymers, in the direction of enhanced hydrophobic association. The effect increases with the surfactant chain length and with the polymer concentration. The effect is larger with PVP than with PEO.

Studies of the Interaction of Cationic Gemini Surfactants with Polymers and Triblock Copolymers in Aqueous Solution

“…The transfer volumes obtained for the 12-3-12 and 12-6-12 surfactants in polymer solutions bear remarkable similarity to those obtained for mixed dodecyltrimethylammonium bromide-alcohol systems (43)(44)(45). ing the characteristic surfactant-polymer interaction, such as the SDS/PEO or SDS/PVP system, where the variation of the polymer concentration brings about only marginal changes in the volume behavior as a function of surfactant concentration (46,47). The variations in the apparent molar volume of the gemini surfactants in aqueous Pluronic solutions is more indicative of a mixed micelle formation or solubilization process as observed for the short to medium carbon chain length alcohols and can be rationalized in a manner similar to that for the surfactant-alcohol systems by considering two concentration regions.…”

Viscosity of Nonionic Polymer/Anionic Surfactant Complexes in Water

“…They confirmed that the anionic surfactant, such as sodium dodecyl sulfate, which was associated with polymer, was indeed in the form of micelles that were attached to the hydrocarbon backbone of the polymer. This structure can also be verified by measurement of heat capacities and apparent molar volumes (8).…”

“…[8] will return to Huggins equation for pure polymer solution, and if ξ = 0, it will return to the viscosity equation for pure polyelectrolyte solution. The constant B and D can be estimated from the viscosity data of the surfactant-free polymer solution by Huggins viscosity equation.…”

“…The parameter A and ξ can be estimated from the viscosity data of polymer-surfactant solution by Eq. [8].…”

Interactions of Polyacrylamide with Cationic Surfactants: Thermodynamic and Surface Parameters

“…The electrostatic interactions between the polymer and surfactant groups are important [9,10]. It has been observed that the interaction between uncharged water-soluble polymer is much easier with more facile anionic surfactants [11][12][13]. The uncharged water-soluble polymers appear weakly associated [14,15] with cationic surfactants, and deriving forces responsible for cationic surfactant-water-soluble polymer interactions is poorly understood in comparison to that of anionic surfactants.…”