Atmospheric Pressure Glow Discharge And Its Effect On The Polyester Fabric Surface Modification Research

The surface modification of chemical fiber and textile is a subject that has important academic significance and practical profit. Plasma processing is a kind of sanitary, "dry" processing technique that has huge attractive and competitive advantages. Many progresses have been achieved on textile surface modification by glow discharge typically generated at low pressure. However, it is very difficult to be industrialized due to requirement for vacuum systems.An atmospheric-pressure glow discharge plasma (APGDP) reactor controlled by dielectric barrier is brought forward and developed in this thesis. The glow discharge can be driven by application of 10/20KHz supply. The electrodes are two parallel metal plates covered by insulating dielectric plates. The gap is 6-7mm. Many kinds of working gasses such as He/Ar,Ar,Ar/acetone and Ar/ethanol can be used. The measurements of the current-voltage curve and Lissajous figure of voltage-electric charges provide sufficient evidence to demonstrate that this is a really stable and homogeneous glow discharge at atmospheric pressure. The discharge course is depicted theoretically and experimentally. The effects of discharge frequency, gap, dielectric on discharge are also discussed in this thesis.Study on PET (polyethylene terephthalate) fabric surface modification by APGD is carried to improve its hydrophilic property and dyeing ability. The effects of working gasses (He/Ar,Ar, Ar/acetone and Ar/ethanol) , discharge duration and voltage on above performances are examined. The results of textile plasma treatment show that the wettability, critical surface tension and dyeing saturation were increased considerably because of the surface etching by non-reactive gas and surface polymerization of large numbers of radicals in ionized organic gasses. The results of plasma grafting polymerization processing show that surface grafting AA is an effective method to overcome the timing-effect. FTIR indicates that a mass of oxygen-contained groups (C=O, C-O, -COOH) are incorporated onto the surface. The APGDP surface modification of PET is very effective. It causes almost the same effects as low-pressure glow discharge plasma, but simpler in operation and industrial application.