Modification of the polycarbonate-polysiloxane block copolymer by poly(ethylene oxide) and poly(N-vinylpyrrolidone)

The introduction of poly(ethylene oxide) and poly(N-vinylpyrrolidone) into the polycarbonate-polysiloxane block copolymer is shown to significantly enhance the hydrophilicity of its films while preserving their high gas permeability and favorable mechanical properties. The effect of the morphology of the block copolymer-poly(ethylene oxide) and block copolymer-poly(N-vinylpyrrolidone) blend films obtained from a solution in a common solvent (methylene chloride) on their physical properties is analyzed. To estimate the compatibility of the polymeric components and to establish the influence of phase decomposition in solution on the final morphology of the blend films, the phase state of the methylene chloride-block copolymer-poly(ethylene oxide) ternary system is studied within a wide range of compositions.