THERMODYNAMIC STUDY OF THE TEMPERATURE-CONCENTRATION DEPENDENCE ALONGTHE KRAFFT BOUNDARY - DIFFERENTIAL SCANNING CALORIMETRY MEASUREMENTS AND MODELING FOR THE N-DODECANOYL-N-METHYLGLUCAMINE-WATER SYSTEM

The dependence of the surfactant solubility temperature on the micella r solution concentration is analyzed on the basis of strict thermodyna mic relationships and using the ideal monodispersed micellar solution model. The approach is illustrated in application to theN-dodecanoyl-N -methylglucamine-water system. Experimental measurements of the surfac tant dissolution temperatures and heats have been performed for the sy stem under study by the differential scanning calorimetry (DSC) method . The calculated temperature change along the Krafft boundary is in re asonable agreement with the experiment. Problems of the DSC data treat ment for the phase transition of interest are discussed.