The aim of the study was to determine surface properties of perfluorodecalin–water system supplemented with surface active polymer Pluronic F-68 which has been dissolved in the aqueous phase at 37°C. Surface tensions were measured by the du Noüy ring method for polymer concentration ranged from 0.00012 up to 0.12 mM. Analogous measurements were performed for air–water system. Surface properties, i.e. the critical micelle concentration (CMC) and the standard free energy of micellization (ΔG⁰_mic) for both studied two – phase systems were determined. Due to the fact that Pluronic F-68 is insoluble in perfluorodecalin, as well as perfluorodecalin does not dissolve in the aqueous phase, both obtained CMC values were similar. Calculated values of ΔG⁰_mic indicated that formation of micelles was spontaneous for polymer concentrations higher than CMC.

13-18