The enthalpic effect due to the interaction between α, β poly(N-hydroxyethyl)-DL-aspartamide (PHEA) and sodium dodecylsulfate (SDS) in aqueous solutions as a function of the surfactant concentration was
measured by the calorimetric technique at various NaCl concentrations. A marked influence of the added electrolyte on the
PHEA-SDS interaction was observed. An analysis of the experimental enthalpies allows to estimate the electrostatic and the
hydrophobic contributions to the enthalpy of interaction between PHEA and SDS micelles. The results were rationalized in terms
of effects due to the screening of the charges residing on PHEA and SDS micelles.