Study On Surface Modification Of High Performance Fiber Via Atmospheric Pressure Plasma

The objective of this study was to establish a continuous atmospheric pressure plasma treatment system through our own developed atmospheric pressure device. Discharge characteristics of atmospheric pressure plasma for analysis and use of its high performance fiber surface modification to improve wettability of fiber surface modification mechanism and analysis.To research the various plasma state under different applied power and gas composition, electrical and optical characterization of plasma have been analysis. Argon plasma discharge current-voltage characteristics and discharge images show that the discharge is mainly composed of a number of very fine filament discharge, appearance close to the glow discharge, the discharge cycle decreases with the increased applied power, discharge filaments began to focus on until became the obvious filamentary discharge. To show the particles state, electron excitation temperature and electron number density from plasma on applied power and variation of ratio of O2/Ar in the plasma, the optical emission spectrum and intensity of specific line were taken. The optical emission intensities is proportional with the power supply at wavelengths of 309 nm, 763nm and 777 nm, as representation of dominating species in discharge, correspond to OH, Ar and O, respectively.Electron excitation temperature and electron number density will dramatic change under certain applied power and have significant impact to the state of the plasma. Continuous atmospheric pressure plasma treatment system was employ to modification the high performance PET fiber, Kevlar fiber and UHMWPE fiber. The change of the surface properties after atmospheric pressure plasma treatment was studied and discussed by SEM and dynamic contact angle. SEM results showed that with the increase of power supply, fiber surface etching effect increased. But the contact angle of the fiber and the applied power supply power is not proportional to the size relationship.In summary, this study carried out by atmospheric pressure DBD plasma discharge characteristics, and fiber modification and the results of their combined analysis of plasma fiber treatment mechanism.