| Among all kinds of fabrics,silk fabric is called the queen of fibers.Due to its excellent physical properties such as low weight,great lustre,soft handle and special durability,silk fabric has become more and more popular.However,the disadvantage of silk is poor wettability and dyeability,so the result of dyeing is not up to the standard.All kinds of modification technology have been used to pretreat silk fabric.Nowadays,plasma treatment has been considered as an important technique which can affect the surface of materials physically and chemically without using chemical reagent and costing much time.In this thesis,a self-designed plasma treatment equipment is used to treat the silk fabrics,which can produce Atmospheric Pressure Glow Discharge(APGD)plasma in air.The effect of APGD plasma treatment on the structure and properties of silk has been investigated.The untreated and plasma-treated silk fabric are characterized using scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),Attenuated Total Reflection(ATR)Fourier Transform Infrared(FTIR)spectroscopy for the measure of surface morphology,element content and chemical state.The K/S value and color fastness are used to evaluate the dyeing properties of silk fabric.The oscilloscope is used to measure the discharge voltage and current which are used to analyze the electrical properties of glow discharge.In addition,the plasma characteristics of APGD is studied by using the optical emission spectroscopy.The main results are as follows:(1)The current waveform of APGD is a sinusoid which is very different from the current waveform of filamentary discharge.The differences between the voltage/current waveforms of filamentary discharge and APGD are used to ensure that the plasma is APGD plasma.The plasma is very uniform and there is no filament.Plasma property is measured by optical emission spectroscopy.The result shows that APGD plasma contains active particles including N2(C)?OH?O3,etc.(2)In this experiment,the applied voltage of 35kV was selected for the treatment.The silk was treated in air(temperature 20±2?)and pressure of environment was 0.1 MPa.Different treatment parameter was plasma treatment time(0,30,60,90,120 and 150 s).After APGD plasma treatment,micro hollows appeared on the surface and the number of micro hollows was increased with the increasing plasma treatment time.When the plasma treatment time was increased,the content of nitrogen was increased from 9.4%to 14.3%,the content of oxygen was increased from 18.3%to 27.8%,but the content of carbon was decreased from 72.3%to 57.9%.More hydrophilic functional groups were introduced into the surface of silk fabrics after APGD plasma treatment.The K/S value of plasma-treated silk fabrics was increased from 1.97 to 4.39,and the longer plasma treatment time,the higher K/S value.Color fastness to dry and wet rubbing of untreated silk fabrics was better than that of plasma-treated samples,but the difference was very small and acceptable.(3)In the experiment,APGD plasma was generated in ambient air and silk fabrics were treated by APGD plasma.The applied voltage was adjusted from 0 kV to 60 kV and the plasma treatment time was 100s.After APGD plasma treatment,the surface of silk fabrics was sculptured and etched,this led that small pits and fine cracks appeared on the surface of silk fabric.The number of small pits was increased with the increasing applied voltage.When the applied voltage was increased,the content of nitrogen was increased from 9.4%to 14.2%,the content of oxygen was increased from 18.3%to 28.2%,but the content of carbon was decreased from 72.3%to 57.6%.More hydrophilic functional groups were introduced into the surface of silk fabrics after APGD plasma treatment.The K/S value of plasma-treated silk fabrics was increased from 1.97 to 5.1 with the increasing applied voltage.Color fastness to dry and wet rubbing was decreased when the applied voltage was increased. |
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