Abstract: The dynamics contact angle of some polymer materials is studied. For untreated polymers, it is found that advanced contact angle is greater than recede contact angle. The hysteresis between the advanced contact angle and recede contact angle is attributed to the heterogeneous of the chemical composition on the polymer surface. For the polymer materials treated by CF₄/CH₄ plasm a, it is found that the advanced contact angle increases greatly com pared with the recede contact angle. The hysteresis increases because of the increasing of chemical composition heterogeneous on the polymer surface. The surface dynamics decay rate constant changes with the plasm a treatment condition of CF₄(%) during the immersion of water for the polymer film s is treated by CF₄/CH₄ plasm a. Thew hole range of CF₄(%) can be divided into three regions, which are distinguished by their different plasm a mechanistic aspects, and different properties of the plasm a polymerized film s. The rate constants of polymer film pretreated by CH₄ plasm a are lower than that of unpretreated polymer film s. It proves that an ultra thin barrier layer provided by CH₄ plasm a is effective to prevent the movement of surface dynamics.

Key words: surface modification, plasma, dynamics contact angle, CF₄/CH₄, polymer, surface dynamics