ABSTRACT
152The properties of Langmuir films of polyaniline (PAn) and also its derivatives (namely, poly-o-methoxyaniline (PoMA), poly-o-toluidine (PoT)), as well as compositions of these polymers with polymethyl methacrylate and copolymer of styrene and maleic anhydride have been investigated. Monomolecular Langmuir films were obtained on water surface by their application both from the individual and from the mixed solutions of polymers in organic solvents (tetrahydrofuran, chloroform). It is shown that the initial surface concentration of the substance and the nature of a solvent used for the deposition of a monolayer have an impact on the magnitude of the surface pressure of PAn monolayers. Dependence of the effective area of monomer link (S eff) on the composition of binary mixture has been studied on a basis of isotherms of surface pressure of binary compositions. It was discovered both of S eff magnitude increasing and decreasing compared to the total values of the areas for individual components. Such behavior of Langmuir films can be conditioned due to the conformational changes undergone by macromolecules into composite monolayers. During an investigation of monomolecular films under conditions of compression–expansion it was determined that the PAns can form both equilibrium and non-equilibrium monolayers. The polymer “memory” effect is developed in a case when the monolayers of PAns are applied on water surface.
