关键词: 等离子体, 甲烷, 四氟化碳, 表面改性, 接触角, 高聚物

This paper studied the surface dynamics for some polymers treated by CF~4/CH~4 plasma during the immersion of water at different temperatures. Arrhenius plots of the surface dynamic decay rate constants showed conspicuous breaks at characteristic surface transition temperature T~s. T~s represents the change of driving force due to the change in basic properties of water in contact with a surface (vicinal water) at the major Drost-Hansen temperature at 15 ℃. The activation energies for the surface configuration change in the water immersion case are found to be small. Results indicate that the surface configuration changes do not require large segmental motions or migration of macromolecules. Motions responsible for surface configuration changes could be well perceived as relatively small rotational motions of the introduced chemical moieties from the surface into the bulk of the film. The dynamic contact angle hysteresis for different polymers treated by CF~4/CH~4 plasma had minimum at T~s. The hysteresis increases at temperature of higher than T~s, and reaches a maximum, then decreases along with the increase of temperature.

Key words: PLASMAS, METHANE, CARBONTETRAFLUORIDE, SURFACE MODIFICATION, CONTACT ANGLE, HIGHPOLYMER