We report the study of the equilibrium and dynamic properties of Langmuir monolayers of poly(styrene-co-malcic anhydride) partial 2-buthoxyethyl ester cumene terminated polymer and the effect of the Mg(NO3)(2) addition in the water subphase on the Film properties Results show that the polymer monolayer becomes more expanded when the electrolyte concentration in the subphase increases Dense polymer films aggregate at the interface The aggregates are transfer red onto silicon wafers using the Langmuir-Blodgett methodology and the morphology is observed by A FM The structure of aggregates depends on the subphase composition of the Langmuir him transferred red onto the silicon wafer