SURFACE TENSION OF MIXTURES OF POLYACRYLAMIDE WITH NON-IONIC SURFACE-ACTIVE SUBSTANCES

The aim of this work is to study the surface properties of mixtures of polyacrylamide (PAA) with nonionic surfactants. In this work, kinetic curves of a decrease in the surface tension of PAA were obtained in the concentration range of 1 * 10-5 ÷ 1 * 10-3 base mol/l, and on the basis of the equilibrium values of surface tension, isotherms of the surface tension of aqueous solutions of composite mixtures based on polyacrylamide (PAA) were obtained with surfactants - nonionic amphoteric N, N – dimethyldodecylamine N-oxide (DMDAO) and nonionic cocoamidopropyl betaine (CAPB). It has been shown that compositions of surfactant with a polymer in the region of low concentrations have a lower surface tension, which is associated with an increase in the surface activity of surfactant – PAA composites in comparison with individual surfactants. The surface tension isotherms were used to determine the critical micelle concentration (CMC) of the surfactant and surfactant-PAA compositions. It was found that the addition of a polymer to a surfactant lowers the CMC by an order of magnitude for the DMDAO - PAA mixture and by more than two orders of magnitude for the CAPB - PAA mixture, which also indicates an increase in the surface activity of the surfactant - polymer mixtures. The use of PAA compositions with surfactants as stabilizers for foams and emulsions opens up prospects for the development of effective emulsifiers and foaming agents.

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