Polyethylene Terephthalate Film Surface Relaxation after Plasma Treatment

This article describes relaxation processes of the Polyethylene terephthalate (PET) film surface after two different plasma treatment methods. It has been found that after direct plasma treatment the PET film wetting angle returns into its initial value. The change of the wetting angle is related to the structural or chemical changes of the surface under atmospheric conditions. The surface was investigated by XPS (X-ray Photoelectron Spectroscopy) method. During the investigation there has been established that alternating current plasma treatment method induces significant chemical properties changes of PET film surface. These changes can be a reason of residual wetting angle value and slower wetting angle relaxation evolution