Abstract

A. D. Mudawadkar¹, G. H. Sonawane¹* and T. J. Patil²

The solvation and desolvation phenomenon of non-ionic surfactants, Iso-Octyl phenoxy polyethoxy-ethanol (Triton-X-100) have been studied by determining the cloud point (CP) at various surfactant concentrations in pure and mixed system with Poly-N-Vinyl 2 – Pyrrolidone (PVP). The CP of pure Triton X-100 was found to be increased with increasing surfactant concentration. The CP of pure surfactant (Triton-X-100) found to be decreased with increased concentration of additive PVP. The CP of mixed system also shows same trends with increased [PVP]. This is mainly due to increase in micelle concentration, also due to the removal of water molecules by added polymers which helps the surfactant micelles to come closer with each other resulting into lowering of CP of the present polymer surfactant systems. The phase separation results from micelle-micelle interaction. Considering CP as a threshold temperature of the solubility, the thermodynamic parameters of clouding process (#DELTA;G0cl, ΔH0cl and #DELTA;S0cl) have been evaluated using “Phase Separation Model” The findings of the present work supports to make the probable evidence of polymer-surfactant interactions in aqueous medium.

Micellization; Cloud Point (CP); Triton-X-100; Poly-N-Vinyl-2 Pyrrolidone (PVP); Phase separation model

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