Preparation And Properties Investigation Of Conductive Celloluse Fabric

The functional fiber, a chemical fiber with special structure, properties and application, plays an important role in textile industry. As one of the functional fibers, electrical conductive fibers have aroused a great interest due to variety of outstanding properties such as antistatic and electromagnetic shielding.So far, most conductive fibers are made by synthetic fibers such as PET、PU and PA which are nonbiodegradable, thus resulting in serious environmental pollution. Cellulose fibers, an alternative method for conductive fibers preparation, are much more environmentally friendly than synthetic fibers and therefore become competitive and promising fiber material. Traditional methods prepare conductive fiber is using Pd collide as a catalyst in electroless plating. However, this method is expensive due to the high cost of plating, hence impeding the industrialization of conductive fibers.In this dissertation, the substrate of conductive fibers was cotton fabric and bamboo fabric. Cotton fabrics and bamboo fabrics were both cellulose fibers. The copper/cotton fabric and copper/bamboo fabric was prepared by two different methods. The preparation process is as below:Firstly, the cotton textile was modified by citric acid, tartaric acid and malic acid respectively, and the bamboo fabric was modified by (3-aminopropyl)trimethoxysilane. Then the OH groups were grafted to the cotton fabrics, while the bamboo fabric grafted with the NH2 groups. Secondly, cotton fabrics adsorbed copper ion which was then reduced by NaBH4.Unlike cotton fabrics, the grafted bamboo fabrics were activated by Ag particles in solution via Ag-N chemical bonds. Finally, both of these two activated fabrics were covered by copper layer by electroless plating. The obtained coating was firm and could pass the peel adhesion test using Scotch(?)-tape. These two conductive cellulose fabrics had displayed high conductivity and EMI shielding effectiveness of more than 40dB.The conductivity of copper/cotton fabric was 6.85×103 S·cm-1 and copper/bamboo fabrics was 1.8×105S·cm-1.The optimized process parameters to prepare copper/cotton fibers are as follow: citric acid, tartaric acid and malic acid is the modifier with concentration of 0.1 mol/L, Cu is the catalyst. The concentration of CuSO4 solution is 0.1 mol/L and the stirring time is 12h.Composition and elements of fabrics were tested by infrared spectroscopy (IR), Raman spectroscopy (Raman), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX) and thermogravimetric analysis (TG).Surface morphology of fabrics was measured by scanning electron microscope (SEM).The spectrum analyzer, resistance tester, and Scotch(?)-tape were used to test the EMI shielding effectiveness, conductivity and adhesiveness.Furthermore, water absorption test of copper/cotton fabrics and mechanical test of copper/bamboo fabrics were performed to compare coated fabric with the uncoated fabric.