Аннотация:The results of an experimental study by X-ray photoelectron spectroscopy of the chemical compositionof the surface of polyethylene naphthalate films modified by low-pressure dc discharge at the anodeand cathode are presented. Filtered atmospheric air was used as the plasma gas. X-ray photoelectron spectroscopyhas been used to study the change in the chemical structure of plasma-modified films and to showthe formation of a significant amount of oxygen-containing groups on the polymer surface.