The micellization behaviour of anionic surfactant sodium caprylate (SCAP) and cationic surfactant cetyl pyridinium chloride (CPC) in the presence of polymers (polyvinyl pyrrolidone, Tween-20, Tween-40, Tween-60, and Tween-80) in aqueous solutions was investigated using conductivity and viscosity measurements at 298.15 K. In water and aqueous polymer solutions of various concentrations, the critical micellar concentration (CMC), critical aggregation concentration (CAC), and polymer saturation point (PSP) for both surfactants have been determined. As the polymer concentration increased, the CAC values for both surfactants declined slightly, while the PSP values remained virtually constant.
The standard free energy of transfer (Go) and degree of ionisation () have been calculated. As polymer concentrations grew, it was revealed that Go values decreased. At 298.15 K, the relative viscosity,, of the aforesaid systems has also been calculated in various polymer solutions. With increasing polymer concentration, the maximum value of I/I,max (I is the interaction viscosity) as a function of R (ratio of surfactant to polymer concentration) changes towards lower values of R. The data were examined in light of the many interactions that occur in these systems.
Author (S) Details
Dr. Ashwani Kumar Sood
Guru Nanak Dev University, Amritsar, india.
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