Preparation And Properties Of Conductive Cotton Fabric Based On Carbon Nanotube Composite System

Cotton fabric has excellent wearability and is widely used for its soft handle,good breathability and comfortable wearing.However,the cotton fabric belongs to the insulation material,and its resistance is relatively large which means that the electrostatic phenomenon can happen easily in the actual production and daily life,causing the burning,explosion,and even threatening the health of people.Therefore,it is of great significance to develop the cotton fabric with electrical conductivity.With the development of textile industry,developing conductive cotton fabric and improving electrical conductivity of fabric has become a hot research topic both at home and abroad.In this research,the carbon nanotubes and polypyrrole were deposited on cotton fabric with layer by layer self-assembly technology,so that the cotton fabric had excellent conductive effect.The main contents of this research included the following three parts:Firstly,carboxylic carbon nanotubes（MWNT_S-COOH）and aminated carbon nanotubes（MWNT_S-NH₂）were used to modify cotton fabric with layer by layer self-assembly technology to prepare composite conductive cotton fabric.The influence of the concentration of carboxylic carbon nanotubes,the concentration of aminated carbon nanotubes,the assembly time and the number of assembly bilayers on the electrical conductivity of the composite conductive fabric were investigated through single factor experiment,characterized by electrical conductivity.The surface morphology and infrared spectrum of the composite conductive cotton fabric were observed under the optimum process conditions by SEM and FT-IR.The results showed that when the concentration of carboxylic carbon nanotubes was1.5 mg/mL,concentration of aminated carbon nanotubes was 1.5 mg/mL,the assembly time was 15 min,the number of assembly bilayers was 8,the conductive properties of composite conductive fabric was better,and the conductivity was 3.42 S/m.The FT-IR showed that MWNT_S-COOH and MWNT_S-NH₂ were successfully assembled on the surface of cotton fabric,while the SEM showed that the surface roughness of the composite conductive cotton fabric increased and the surface of the fiber was covered by a uniform composite membrane.Secondly,MWNT_S-COOH and PPy were used to modify cotton fabric with layer by layer self-assembly technology to prepare composite conductive cotton fabric.The influence of the concentration of carboxylic carbon nanotubes,the concentration of Py,the concentration of FeCl₃,the time of polymerization and the number of assembly bilayers on the electrical conductivity of the composite conductive fabric were investigated through single factor experiment,characterized by electrical conductivity.The surface morphology,infrared spectrum and the distribution and content of surface elements of the composite conductive cotton fabric were observed under the optimum process conditions by SEM,FT-IR and XPS.The results showed that when the concentration of carboxylic carbon nanotubes was1.0 mg/mL,concentration of Py was 1.0 mol/L.concentration of FeCl3 was 1.0 mol/L,the time of polymerization was 30 min,the number of assembly bilayers was 5,the conductive properties of composite conductive fabric was better,and the conductivity can reach 103.85S/m.Both FT-IR and XPS showed that the MWNT_S-COOH and PPy were successfully assembled on the surface of cotton fabric and showed that PPy had been doped.The SEM showed that the surface roughness of the composite conductive cotton fabric increased and the surface of the fiber formed a dense conductive path.When the number of assembly bilayers reached more than 5,it would cause the aggregation of PPy.The durability test showed that the conductivity of composite conductive cotton fabric decreased from 103.85S/m to 90.78 S/m after 10 times washing,indicating that the fabric had good washing effect.Finally,under the optimum process conditions,in addition to improving conductivity obviously,the electromagnetic shielding performance,UV protection and hydrophobicity of fabrics were improved.The results showed that when the number of assembly bilayers was 5,the shielding effectiveness of the fabric in the frequency range of 8¹2 GHz was more than 20dB,and the shielding effect mainly due to absorption;the transmittance of UVA was 0.04%and the protective coefficient of fabric was more than 3000 which indicated that the fabric had excellent UV protection performance;the contact angle of fabric to water reached 160°,indicating that the fabric achieved super-hydrophobic effect and can realize the transformation of cotton fabric from hydrophily to hydrophobicity;composite conductive cotton fabric can be used for all kinds of protective fabrics.At the same time,the performances of the fabric were tested.The results showed the wear-resistant layers were improved by 300.0%;warp and weft strength retention rate of composite conductive cotton fabric were 94.57%and 88.83%,respectively;the moisture permeability decreased only by 7.87%;the fast recovery angle and slow recovery angle decreased by 7.45%and 5.17%,respectively;However,the effect on the breathability of the fabric was slightly greater,a drop of 76.57%.