Preparation And Properties Of Conductive Fabric With High Washability

Wearable electronic products can monitor human health at any time which attracted more and more attention.The researches concerning transform clothes into electronic products are increasing because of the softness,comfort and portability of textiles.If electronic textiles intend to be put into the market,the life span is the most important factor taken into account.All electronic textiles are damaged by various factors during their life span,while the most destructive force is washing process.The falling off of the conductive coating will result in deteriorating conductivity and unstable signal detection when they are used as smart garment.Therefore,it is urgent to solver the washing resistance and stability of electronic textiles.The conductivity of conductive component and adhesion of conductive component to fabrics are very important to the application of electronic textiles obtained by coating,however,the lack of activated functional groups on the surface of fiber is not conducive to the ability of conductive layer.Therefore,it is an important research direction to pretreat fabrics,expose the functional groups or introduce new functional groups,enhance the binding force between the fiber and the conductive layer,prepare fabric electrode with excellent electrical conductivity and washing resistance.In this paper,two bifunctional fabric electrodes with good electrical conductivity and antibacterial was successfully prepared via silane modification and electroless plating,with silver mental as conductive component and polyester and cotton fabrics as matrix,grafting thiol groups on the surface of fiber by silane coupling agent.The surface morphology,crystallinity,thermal stability,surface hydrophobicity and other properties of silver-plated fabrics were characterized.The fabric electrode was used to capture the ECG during human motion.1.Using cotton fabrics(CF)as substrate,?-Mercaptopropytrimethoxysilane(MPTS)as modifier,modified cotton fabrics(M-CF)was prepared at different temperature,concentrations and time to introduce thiol group into the surface of fiber,and then using Tollens agents,silver ammonia ion([Ag(NH₃)₂]⁺)was reduced by glucose,silver nanoparticles were loaded on the surface of M-CF,silver/modified cotton fabric(Ag/M-CF)was obtained.The relationship between silane grafting and electrical conductivity was studied.The experimental results show that:the silane grafting rate is accelerated at higher temperature and the surface of M-CF is hydrophobic.The silane grafting ratio should be in some range to obtain optimum conductivity of the fabrics.When the modified condition is 1 wt%MPTS,100°C,1h,the silver layer of the conductive fabrics was compact and uniform,the electrical resistance was as low as 0.33?/sq and 2.49?/sq after undergoing up to 200 washing cycles.2.The optimum modification condition in the second chapter was selected to modify polyester fabrics(PETF),The performance differences between M-CF and M-PETF were compared and silver nanoparticles(Ag NPs)deposition process of Ag/M-CF and Ag/M-PETF was observed via scanning electron microscopy(SEM).The experimental results showed that the surface of M-PETF is hydrophobic,the thermal stability of PETF is improved by silane modification.The grafting of silane onto fiber was confirmed by electron spectroscopy(EDS),the surface of polyester fiber was smooth and the fabric was neater,Ag/M-PETF had thinner silver layer and the fibers were completely covered compared to Ag/M-CF.The initial electrical resistance of Ag/M-PETF was 7.18 m?/sq and 0.93?/sq after 200 washing cycles.3.Investigateing the factors affecting the stability of conductivity of Ag/M-CF and Ag/M-PETF via signal factor experiments,comparing the antibacterial properties of them,and apply them to capture ECG of human motion.The results showed that the elasticity of cotton fiber was poor and the silver layer of Ag/M-CF after stretching and bending tended to exfoliation leading to a sharp decline in conductivity,while the polyester fiber has elasticity and the silver layer of Ag/M-PETF showed a fracture trend,its conductivity was less affected by tensile and bending.After being placed in a constant temperature and humidity environment,silver particles scattered in Ag/M-CF are easy to oxide which resulted in the decrease of conductivity,however,the electrical resistance was almostly unchanged after 5 weeks,the conductivity of Ag/M-PETF was almost unaffected.The release rate of Ag/M-CF was faster and the antibacterial efficiency of the fabric was 100%,after 200 washing cycles remained 92.82%.The release rate of silver ions in Ag/M-PETF was slow,and the antibacterial efficiency decreased from 84.15%to 83.93%.Two kinds of fabric electrodes were embedded in smart garment successfully capture the ECG signals of human in running states and the measured heart rate increases with the increase of movement speed,moreover,the ECG waveforms were still clear after 200 washing cycles.