SURFACE PROPERTIES AND GAS PERMEABILITIES OF POLYBUTADIENE MEMBRANE TREATED WITH VARIOUS FLUORINE CONTAINING GAS PLASMAS

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A membrane surface of polybutadiene (PBD) has been treated with CF₂ClCF₂Cl-. CF₂Cl₂- and CF₄-plasmas. The scanning electron microscopy (SEM), water contact angle, and X-ray photoelectron spectroscopy (XPS) results clarified that these three plasmas modified PBD surface in a different manner. That is, CF₂ClCF₂Cl and CF₂Cl₂ plasma induced not only graft reaction but also polymerization on the PBD surface. On the other hand, CF₄-plasma modified the PBD surface only by graft reaction. CF₂ClCF₂Cl- and CF₂Cl₂-plasma modifications remarkably improved the gas permselectivity of PBD membrane due to the introduction of both fluorine and chlorine atoms at the surface.