Abstract
Temperature dependent micellization of 5 wt% F127 has been studied below and above its critical micellization temperature (CMT) using isothermal titration calorimetry. Monomer and micelle dissolution enthalpies are used to calculate solute–solute and solute–solvent interactions. Significant differences are observed at different temperatures indicating a difference in solvent re-structuring around the monomers and micelles. Variation in partial molar enthalpy of the solvent with change in solute concentration is found to be small, in passing from monomer dissolution regime at 288 K to micelle dissolution regime. Enthalpy measurement for the de-micellization process of aqueous F127 has indicated subsequent oligomer (or monomolecular micelle) formation in presence and absence of solubilized salicylic acid (SA). Significant reductions in critical micelle concentration (cmc) and enthalpy of micellization have been observed for F127 with solubilization of SA. Solution behavior of SA solubilized F127 system has been treated using regular solution theory and a decrease in the interaction parameter is observed with increased concentration of solubilized SA indicating its existence in the core region rather than corona.
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