Abstract
Dielectric barrier discharge (DBD) plasma can significantly modify the surface of polymers, and DBD plasma is commonly generated by an ac power source. In this paper, homogeneous DBD plasma excited by repetitive unipolar nanosecond pulses is produced and studied in atmospheric air, and the application of surface treatment of polyethylene terephthalate (PET) and polytetrafluoroethylene (PTFE) is investigated under different experimental conditions. Results show that the nanosecond-pulse DBD efficiently enhances the hydrophilicity of the polymer surface, and homogeneous DBD with a low power density has a good treatment result. The effect of applied voltage, pulse repetition frequency, treatment time and air gap is obtained on polymer surface modification. After the treatment, the contact water angle is decreased from 78.8° to 27.7° with PET and from 107.9° to 67.7° with PTFE.
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