Atmospheric Pressure Glow Discharge Plasma In Intermediate Frequency And Its Application To Surface Modification Of Textile Fibers

During the last decades,plasma science and technology has developed very rapidly,and it also has been placed in an important position in many fields.Low-temperature plasma technology which promises well is an environment-friendly method with huge market potential.It is a clean, dry,time-saving,high efficient,water conserving,energy conserving and pollution-free physical technique.When applied in the treatment process of textile,low-temperature plasma technology can greatly reduce the consumption of water,steam,energy and chemicals,therefore pollution burden on environment is greatly lessened.Along with the development of manufacturing technology and plasma technology,plasma machine now is stepping in to industrialized stage.Due to its high efficiency in use of material and energy,non-toxic products,it is used in many industries such as electrical communication,surface modification,environment protection,clarification of waste water and gas,and so on.However, traditional low-temperature plasma induced under low pressure depends on vacuum devices, which limits the application of plasma technology to a large extent in industrial scale.Getting rid of the vacuum devices,pseudo-APGD(Atmospheric Pressure Pseudo-glow Discharge)plasma is especially suitable for the use in modern continuous massive production.In addition to the homogeneous,stability discharge with small energy density as APGD(Atmospheric Pressure Glow Discharge),it is effective in producing many times discharge with more active particles and longer duration.It is simple and convenient.Therefore,pseudo-APGD plasma and its application become the central concern of low-temperature plasma study in recent years.In this paper,a self-design atmospheric pressure dielectric barrier discharge reactor in intermediate frequency is introduced firstly,which is equipped with power supply of 18 KHz.And the working gas is Ar(argon).Through a series of related experiments,the voltage-current waveform and voltage-charge Lissajous figures are received.Results show that plasma generation of self-design AC(Alternating Current)machine is pseudo-APGD.All data found that the concentration of Ar is an important condition to keep the uniformity and stability of plasma discharge.The higher concentration of argon will be conductive to the uniformity and stability of discharge.In order to maintain the concentration of argon,reducing the outflow rate of argon must be correspondingly reduced with the increase of the distance between two barriers.Semi-closed device,the cost of which is still well below the low pressure plasma device,is useful to increase the concentration of argon in the discharge space.So it has the feasibility of industrial application.Films deposition by pseudo-APGD has been finished in the material treatment device.Using acetone and AAc(acrylic acid)monomer individually,two yellow transparent films were prepared by AC dielectric barrier discharge at atmosphere pressure.The composition of films was characterized by FTIR.The results showed that AC dielectric barrier discharge in intermediate frequency at atmosphere pressure can polymerize carboxyl-containing functional films.And their functional groups are very similar,even if using two different monomers.In the next place,the wool woven fabric,PET(polyester)woven fabric,PP(polypropylene)non-woven fabric and PP woven fabric were treated by Ar plasma in the trials.Results displayed that plasma treatment can enhance the wettability of wool,polyester and polypropylene fibers,and plasma-induced grafting can effectively avoid the"aging effects"of materials treated by plasma.SEM(Scanning electron microscopy)photographs under different conditions revealed that Ar plasma treatment causes the increase of surface roughness and the specific surface area.The plasma-induced grafting treatment obtained the more apparent results.XPS(X-ray photoelectron spectroscopy)analyses revealed that Ar plasma treatment introduces an amount of oxygen groups on the PP fabric surface,such as -C-O,-C=O.And the plasma-introduced grafting of AAc introduces the carboxyl group on the surface of PP fabric.These polar group will incorporate with moisture through hydrogen bonding and help moisture penetration and binding on the fiber surface.Under the action of water molecular,these polar groups will also generate ionization and lead to a structural layer of conduct electricity on the fiber surface,which enhances the electrostatic dissipation.Therefore,the anti-static property of acrylic fiber increased after plasma treatment.Dyeing was used to evaluate the result of plasma modification of fabrics.Plasma treatment introduced the carboxyl groups on to the fiber surface.The carboxyl groups can incorporate with cation dye.Therefore,the uptake of dyes and K/S value increased obviously.Recently,there are few studies have investigated the optical emission spectroscopy diagnosis of acetone species in intermediate frequency argon/acetone plasma at atmospheric pressure.Argon /acetone plasma jet was generated from a nozzle using an AC discharge in intermediate frequency at atmospheric pressure.The spectral lines of argon and acetone plasma emission were obtained and analyzed by using HR2000 spectral diagnosis equipment.The experimental results indicated that spectral diagnosis has been proved a workable method.It is significant for the application of OES diagnosis of volatile organic reagent in argon plasma,and is important to the concept of plasma polymerization of volatile organic reagent.There exist large differences in the activity species of acetone plasma between at atmospheric pressure and under vacuum condition, and oxygen is the most important influencing factor.In addition,the paper shows the topography of the deposition acetone film with two light sources,He-Ne laser light and the strong white light source.The topography indicates that through experiment,achieved a continuous deposition film in intermediate frequency plasma at atmospheric pressure.