Polypropylene Fabric Of Atmospheric Pressure Glow Discharge Plasma Surface Modification

The surface modification of polypropylene fiber (FFP) by atmosphere pressure glow discharge plasma (APGDP) has been researched in this thesis, which adopted the APGDP treatment processing and aimed at the characteristics of poor wettability and dyability of PPF.In this thesis, firstly we trial-produced an APGDP reactor. After comparison of several electrode materials and constructions, we chose the stainless steel flat panel metal electrode, and after continuous improving and perfecting its surface lightness, it came to the standard of discharge. According to electrode construction and electric circuit parameters, we customer-made Quartz insulating dielectric plates with particular size and thickness, and the gap between two electrodes is adjustable according to the operation. In consideration of industrialization prospect of plasma treatment, we made a series of experiments with many kinds of working gases, and stable, homogeneous APGDP has been established with gases such as He/CO2, He/NH3, He/Ar ,He , and etc. Secondly, volt-ampere characteristic is measured. Comparing the discharge current and voltage waveform at low and atmospheric pressure, It demonstrates that the stable, homogeneous APGDP has been established. Thirdly, The generation and mechanism of discharge, and some factors that affect discharge are investigated in detail.The impedance matching between the power supply and reactor directly affects the quality of discharge and the effect of modification, so it is the key issue to APGD. We studied and discussed the impedance matching by means of primary-side and secondary-side matching, parallel and serial-connection matching based on actual circuit of laboratory. After a lot of experiments the approximate matching-point has been approached at last. It showed that the modification effect on PPF of APGDP in case of matching is obvious better than that in case of un-matching.The surface modification of PPF by APGDP was researched using the self-made reactor, and the dye-uptake amounts to 27.41%, K/S is 4.47. By using of analysis technique such as FTIR, optical emission spectrum (OES), wettable rate, dye-uptake (K/S), the wettablity and dyablity of PPF both treated and untreated were measured. The factors that affect the plasma modification effect, such as treatment time, the composition of working gases, were studied. The wettability of PPF treated by APGDP of many gases was improved, but there was timing-effect. Among those working gases, the effect of He/CO2, He/NH3 plasma was better, and the timing-effect was weaker. And the plasma modification effect at atmosphere pressure was better than that at low pressure.In a word, the surface modification of PPF by APGDP is effective. Comparedwith low-pressure glow discharge plasma, APGDP is more advantageous, it is simple to operate and easy to industrialize.