Treatment of polytetrafluoroethylene films by atmospheric AR three-dielectric layers barrier discharge plasma

Atmospheric pressure dielectric barrier discharge(DBD) plasma surface treatment is a useful means to modify the properties of polytetrafluoroethylene(PTFE) films, such as hydrophily, adhensive ability. A generator with more dielectric layers will affect the plasma characteristics, and then affects the treatment effects on PTFE films. To investigate this influence, some experiments were carried out with a three-dielectric-layer generator induced by a sub-microsecond pulsed power, whose amplitude is about 120kV, pulse width 230ns, rise time 120ns and frequency 130Hz~1kHz. And The plasma was obtained in atmospheric pressure Argon gas. The Surface properties are investigated by different conditions, including the applied voltage, current and frequency and compared to the results from two-dielectric-layer discharge plasma. The surface water contact angle changed from 118 degree to about 85 degree on more strict conditions. The most important is that the treatment surface area is increased one time. It indicates that this means is effective and potential.