Optimization Of Configuration Used To Treat Material Surface By Dielectric Barrier Discharge At Atmospheric Pressure

In this paper, it is based on previous results of our research group and "Studies on the Surface Modification to Synthetic Fibers and Fabrics Using Atmospheric Pressure Dielectric Barrier Discharge"(No:02SG28) supported by the "Dawn Project" of Municipal Education Commission that configuration Used to Treat Material Surface by Dielectric Barrier Discharge at Atmospheric Pressure is optimized. It also achieves the results by using this configuration to materials surface modification as we were expected at the beginning of the research.In this paper, Experimental results indict that dielectric constant and dielectric thickness are primary factors to effect on discharge by material surface modification experiment and equivalent capacitance experiment by Lissajous figure of the oscilloscope. For optimizing equipment and improving efficiency, discharge, choice of insulation dielectric should adopt principia of using higher dielectric and lower dielectric thickness. In this paper it also optimizes the electrode by taking cylindricalelectrodes instead of flat ones to treat wool to prevent material surface from being etched. The results of experiments indict that this way improve not only anti-felting property of wool but also using efficiency of output power.Qualitative analysis on emission spectrum of dielectric barrier discharge at atmospheric pressure indict that improvement of prompting voltage can improve plasma intensity. The greater gas flow is, the lower plasma intensity is, mezzo gas flow is advantaged to improve plasma intensity. As to gas mixture, increase or decrease the content of gas which is easy to discharge can reduce or elevate plasma intensity. Improvement of plasma intensity is advantaged to maintain discharge and plasma actual application . In actual application, we can change discharge plasma state by adjusting gas parameter according to needs.In this paper, some macromolecule textile materials such as fine denier polypropylene .. terylene and wool are modified surface by optimized dielectric barrier discharge plasma atmospheric pressure. Wetability of treated fine denier polypropylene is improved greatly. Fine denier polypropylene is from hydrophobic to hydrophilic. In the same condition of discharge, Argon discharge^ Argon-O2(9:l) discharge and argon discharge with continuous movement of textile material all have etching effect on treated material by SEM pictures. Etching effect of Argon-O2(9:l) discharge is more distinct. By analysis of FTIR assimilatespectrum, microcosmic structure of treated materials all have been changed. Material treated by Argon-O2 (9:1) discharge can be found oxygenic radical or double bond structure. By the analysis of dyeing property , dyeing effect has visibly deep color effect. By testing capillary effect > instant hygroscopic and distilled water contact angle of terylene textile treated by argon discharge, it can point that wetability of terylene textile is also improved greatly and antistatic capability of terylene textile increases obviously but rupture intensity of terylene textile decreases little. After wool is treated by dielectric barrier discharge, its anti-felting property ameliorates evidently.In theory analysis it indicts that one inductance circuitry which is added between power supply and plasma reactor in dielectric barrier discharge circuitry is advantaged to protect power supply and improve efficiency. In the process of discharge, impedance matching network of the whole circuitry is in the state of self-adjusting. Impedance matching theory has reference value to design plasma power. Experimental results also indict that power frequency has effect on discharge. In actual application, choice of power frequency should be appropriate, and in general, at atmospheric pressure, it had better tens kilo-Hertz.