Preparation And Properties Of Fiber Used Conductive ATO@TiO₂ Whisker With Light Color

Conductive fiber is a new emitting functional material with conductive ability,which was prepared by doping conductive filler with fiber-forming polymer.With the development of science and technology,smart textile market is growing and growing,resulting in gradually permeating into many fields of conductive fiber,such as industry,military,medical,electronic communications and so on.More and more requirements are raised for conductive fiber with the application area expending.Light tint of conductive fibers is a major development trend.As the core part of conductive fiber,conductive filler not only determines the conductivity property,but also the color of composites fiber.So far,the conductive fillers commonly-used in conductive fiber are always black or in dark color,resulting in dark color appearance of obtained fiber.Because of this phenomenon,the visual effect of fiber is accordingly affected,and the range of application is also limited.Even though some research is reported on conductive fillers in light color,this research are relatively scattered and shallow.Consummating the investigative system to achieve optimization and stabilization of product performance is necessary,providing fundamental basis for further developing diversified products and raising the added value of products.Besides,the shapes of the light-colored conductive fillers are spherical,rodlike conductive filler with better conductive ability in light color is barely investigated.Therefore,exploring the preparation method of light-colored conductive whisker has important scientific research significance and practical value.In order to prepare rodlike conductive whisker with both light-colored and conductive property,TiO₂ whisker with good light extinction property was firstly synthesized,after being coated with ATO conductive layer,light-colored ATO@TiO₂ whisker was finally obtained.The forming and doping mechanisms ATO@TiO₂ of whisker were investigated,and the conductive and light extinction mechanisms were also explored.Finally,the feasibility of applying ATO@TiO₂ whisker to fiber is investigated.The research work and results have been summarized as following:?1?Microwave heating and high-temperature calcinations treatment was employed to synthesized rodlike TiO₂ whisker.Scanning electron microscope and X-ray diffractometer were used to analysis the microstructure and crystallization property of products synthesized in different heating time.The growing mechanism of TiO₂ precursor in microwave field was reported.Besides,thermogravimetric analyzer and infrared spectrometerwere used to monitor the changes in chemical structure during transforming from TiO₂ precursor to TiO₂ whisker under high-temperature conduction.The results show that:The comprehensive performance of TiO₂ whisker obtained after 3 min heating and then burning at high temperature is optimal,the product can be employed as carrier in next experiments.?2?Hydroxylation treatment was operated to TiO₂ whisker firstly,and then wet chemical coprecipitation and high-temperature calcinations treatment were employed for inorganic coating,ATO@TiO₂ conductive whisker with light color was finally obtained.After improving the coprecipitation method,the coating and doping effort was improved.The efforts of pH value,Sb/Sn molar ratio,Sn/Ti mass ratio and calcination temperature on the conductive property of ATO@TiO₂ whisker was explored,and the process parameters were optimized.Finally,characterization and analysis were studied on the obtained ATO@TiO₂whisker.The results show that:ATO@TiO₂ whisker has core-shell structure.ATO conductive layer,which is piled up by ATO nanoparticles,is well-structured and combine tightly with TiO₂ carrier.This structure is beneficial to forming conductive network.Besides,the result of surface element analysis proved that Sb⁵⁺was dominantly doped in ATO nanoparticles,compensating effect is according avoided,the conductive property is improved.?3?The forming process of ATO@TiO₂ whisker was discussed,and the coating and doping mechanism during this process was explored.Based on the surface distribution model of ATO on the surface of TiO₂ whisker and resistivity test results,forming mechanism of ATO conductive network was explained by equivalent circuit model.The resistance calculation was carried out to verify the conductive mechanism of ATO@TiO₂ whisker.?4?The light-extinction mechanism was explored based on light scattering theory,and the efforts of pH value,Sb/Sn molar ratio,Sn/Ti mass ratio and calcination temperature on whiteness of ATO@TiO₂ whisker were discussed.The reason for high whiteness of ATO@TiO₂ whisker was explained.?5?Light-colored ATO@TiO₂/PAN conductive fiber was obtained via solution mixing and wet-spinning.The microstructure,crystallization property,thermal performance and electro-conductive property of composite fiber with different ATO@TiO₂ whisker content were explored.The stability of electro-conductive property of ATO@TiO₂/PAN composite fiber on various aspects,such as heat resistance,summer light resistance and washable,were studied to verify the feasibility and reliability of ATO@TiO₂ whisker when being applied in fiber.