Construction Of PANI/Metal Composite Film Based On Fabric And Its Application In Electromagnetic Shielding

The early development of electromagnetic shielding fabric is mainly connected with metal materials, such as the blended with the metal fiber or chemical, or electrochemical,plating metal ion onto the surface of the fabric, but the participation of metal materials brings a few unavoidable problems. First, the compatibility of metal and nonmetal materials is poor, which leads to the low adhesive strength. And also, the hard quality of the texture for the mass metal leads to the easy fall of the plating, and the metals have the tip discharge and the thorn person phenomenon, which limits the application of dressing.Thus, researchers pay attention to the conductive polymers to solve the problems above.The combination of conductive polymers and the common fibers or textures can not only product the functional textile, which has various of functions such as anti-electromagnetic radiation, anti-static, but also maintain the unique flexibility of fabric, and the integrity and electrical conductivity of polyaniline film can be ensured on the basis of changing the shape of the substrate. The combination of conductive polymers and common texture can realize the diversification, intelligence, and improve the quality and performance of the new fabric. Conductive polymer and metal composite coatings were prepared on the surface of polyester, and the composite plating process and properties were studied in order to improve the electromagnetic shielding performance, oxidation resistance and acid alkali resistance, etc.The conductive polyaniline was synthesized on the surface of polyester fabric, treated by alkali, by in-situ polymerization. The conductive ability of various factors in the synthesis process was discussed, and the optimum process parameters were obtained by orthogonal design. The structure and properties of the products were characterized by IR,X ray diffraction analysis and thermogravimetric analysis. The results showed that the polyaniline film was successfully synthesized on the surface of the polyester, and theoptimum parameters were determined by single factor analysis and orthogonal experiment- The concentration of aniline was 2.5mol/L, the adsorption temperature was 60, the concentration of 1:100 was 0.6mol/L, hydrochloric acid concentration is 0.625mol/L, the pick-up rate is 80%, the oxidant was 4s and the oxidant bath ratio was 1:50. However, the conductive mechanism of the conductive mechanism of the polyaniline limited its conductivity, so the electromagnetic shielding effectiveness of the polyaniline / polyester composite fabric is relatively low.The surface of polyaniline / polyester composite fabric was treated by hyperbranched polyamidomine/Ag+, and the influence factors of electroless copper plating on the surface of composite fabric were discussed. The optimum process of electroless copper plating on the surface of Polyaniline / polyester composite made sure- pH of activate fluids is 6, copper sulfate concentration is 20g/L, the nickel sulfate concentration is 2g/L, sodium tartrate concentration is 90g/L, the formaldehyde concentration is 10mL/L, the sodium hydroxide concentration is 14g/L,the chemical plating time is 25 min and the temperature is 30 ℃. Surface morphology analysis, thermal stability analysis, friction resistance and electromagnetic shielding ability of the copper / polyaniline / polyester composite fabric were discussed. The results show that the copper particles can uniformly cover the fiber surface, the composite fabric has good electrical conductivity, and the electromagnetic shielding ability can be up to 130 dB.The comparison of copper / polyester and copper / polyaniline / polyester composite fabrics by the scanning electron microscopy, X ray diffraction and the test of electromagnetic shielding effectiveness show that the polyaniline interlayer can significantly reduce the copper particle size, and improve thermal stability and friction resistance of fabric.