INVESTIGATION OF THE SURFACE DYNAMICS OF PET TREATED BY CF4 CH4 PLASMAS - IV - APPLICATION OF STATIC STATE, DYNAMIC CONTACT-ANGLE AND ANGLE-DEPENDENT XPS METHODS/

The surface dynamic behaviors of PET modified by CF4/CH4 plasmas were investigated by static state, dynamic contact angle and X - ray photoe lectron spectroscopy (XPS) techniques. It was found that the hydrophob ic characteristics of the modified PET surface decreased through water immersion. Decay constant k of Surface Dynamics of the modified surfa ce can be calculated using the measurement results of the contact angl e and the angle - dependent XPS, being a probe, k values can be used t o characterize the surface dynamic behavior of the modified PET. Exper iments proved that the CF4/CH4 plasmas show stronger hydrophobic effec t than that of pure CF4 plasma alone.