Preparation And Intelligent Display Of OFF-ON Eletrothermal Fluorescent Color Changing Fibers

The continuous development and progress of high and new technology will inevitably drive the evolution of society into an intelligent society,and the process of social intelligence should cover many intelligent fields of life.As the foundation of many intelligent revolution,functional sensing materials have attracted more and more attention in the high-tech revolution.As a kind of temperature sensing materials,thermochromic materials have covered intelligent display,monitoring and recognition,anti-counterfeiting and camouflage,information encryption and other fields.For the electrothermic fluorescent fibers that can accurately drive fluorescent materials with Joule heat,it is of great scientific significance to make them have intelligent recognition and display function.In this paper,the state transformation of phase change materials drives the aggregation/dispersion state change between fluorescent dyes and fluorescent extinguishing agents,and the preparation of "off-on" red,green and blue thermochromic discoloration materials.Using the principle of superposition of three primary colors,the thermochromic discoloration materials of whole spectrum are obtained.The combination of thermochromic dyes and coaxial wet spinning technology is used to prepare electrochromic discoloration fibers.Intelligent responsive fluorescent recognition fiber is constructed by using fiber electric drive precision regulation characteristics and information recognition system,so as to achieve the functional and intelligent fluorescent fiber.The main research contents are carried out in three aspects:1.According to the different aggregation and dispersion fluorescence expressions of Nile red and coumarin dyes,the Fuster resonance energy transfer principle was used to add fluorescence extinguishing agent to make the fluorophore in the palmitic acid in the crystallization/melting state show aggregation quenching/dispersion phenomenon,so as to obtain the trichromatic thermofluorescent materials.In order to display multiple fluorescence expressions,the trichromatic fluorophore was mixed with different molar ratios.A whole chromatographic thermochromic system with off-on effect was obtained.2.Electro-fluorescent chromophobe fibers were prepared by blending chromophobe materials and fiber forming base materials with sodium alginate by coaxial wet spinning technology.The surface and cross section of the fluorescent fibers were characterized to prove that the fibers were uniform in thickness,and the cross section was a core-skin structure covered with electric heating wires,and the chromophobe materials were well dispersed in sodium alginate matrix.Through the characterization of the components of electrothermic fluorescent fibers and the test of thermogravimetric analyzer,it is shown that the prepared fluorescent fibers have simple structure,distinct elements and good thermal stability.3.The obtained electrothermic fluorescent color-changing fibers with high fluorescence color contrast,good fluorescence reversibility and accurate regulation can be combined with infrared adaptive system to realize flexible intelligent display.The flexible fluorescent color changing fiber is applied to the fabric by means of embroidery,and combined with small size and light weight portable raspberry PI infrared acquisition system and numerical control constant current source system,the intelligent display textile is designed which can accurately identify the target of the external environment,feedback the electric signal in real time,and use the switch of fluorescent color for early warning.