Аннотация:The interaction between stoichiometric interpolyelectrolyte complexes (cross-linked poly(sodium acrylate) - linear polyamine) and anionic surfactants has been investigated. It was first stated that the polyelectrolyte gels can sorb effectively anionic surfactants. The driving force of the process is the substitution reaction which results in the polymer-colloidal complex (linear polyamine-anionic surfactant) formation within cross-linked matrix. The structure of the reaction products was studied by means of wideangle and small-angle X-ray scattering and differential scanning calorimetry. It was shown that cross-linked matrix does not prevent from forming lamellar structure of the micellar phase characterizing for polymer-colloidal complexes.