Effect of the degree of grafting in hydrophobically modified inulin polymeric surfactants on the steric forces in foam and oil-in-water emulsion films

► The adsorbing inulin-based graft copolymers form inulin-loops layers at film surfaces. ► Increase of the grafting degree leads to reduction of the inulin-loop size. ► The steric interaction between the layers of inulin-loops results in repulsive force. ► The steric force weakens with reducing inulin-loops size.