Preparation And Properties Of PI/ZnO And Alucone/Zincone Composite Film Colored Carbon Fibers

The excellent properties of carbon fiber materials with the high axial strength,high modulus,high conductivity and ultra-high temperature resistance,make it mainly concentrated in the fields of aerospace,textile,medical supplies and sports goods.The black color of carbon fiber materials cannot meet the demand for rich colors,so it is necessary to prepare colorful carbon fiber materials.But the inert chemical surface and high crystallinity of carbon fiber is difficult to color with traditional dyes.Researchers use the three-dimensional photonic crystal structure color assembled by monodisperse microspheres instead of traditional dyes to solve the carbon fiber coloring problem.However,the three-dimensional photonic crystal structure assembled by monodisperse microspheres are complicated in structure,and rely on van der Waals force connections between the microspheres,which are easily broken under the action of external forces,have poor mechanical stability,and are difficult to control the density and the order of the microspheres.Therefore,in this paper,the carbon fiber is colored by the simple structure of thin film interference and the one-dimensional photonic crystal structure,and the chemical reaction that occurs on the surface of the carbon fibers by molecular layer deposition,form a strong chemical bond and improve the mechanical stability of the structural color.Finally,successfully prepare a series of structural colorful carbon fibers with high mechanical stability,high saturation and high brightness.Firstly,the molecular layer deposition method was used to deposit polyimide?PI?and ZnO films on the surface of carbon fibers.And five kinds of structural color of purple,blue,cyan,yellow,and red with high-saturation,bright-color based on thin film interference principle were prepared by controlling the thickness of ZnO.Angle-resolved reflection spectra demonstrates that the colored carbon fibers have the optical reflection properties of radial angle-independence and axial angle-dependence.The colored carbon fiber with PI/ZnO composite film show high stability in the light fastness test.Compared with the black carbon fiber,the deposited polyimide?PI?and ZnO films enhanced the strain and stress of the carbon fibers,the tensile strength increased from 1.94 GPa to 3.92 GPa,and the strain rate increased from 1.84%to 5.01%.Secondly,a single-layer Alucone film is deposited on the surface of the carbon fibers substrate.And structural color carbon fibers fabrics with high mechanical stability,high-saturation,bright-color,based on thin film interference principle were prepared by controlling the hickness of Alucone.Angle-resolved reflection spectra reveal that the colored carbon fibers have the optical reflection properties of radial angle-independence under scattered light mode and axial angle-dependence under specular reflection mode.And the reflection peak position of carbon fiber fabrics CFF-2100 blue-shifted from 710 nm to 506 nm and carbon fiber fabrics with porous Al₂O₃ film were obtained,which with a specific surface of 302.1 m²/g,pore diameter of 3.53 nm,and maximum adsorption capacity of 164.2 ml/g.Finally,on the basis of the above work,Alucone/Zincone periodic one-dimensional photonic crystal colored carbon fiber fabrics were prepared.And structural color carbon fiber fabrics with high-saturation,bright-color,and high mechanical stability based on one-dimensional photonic crystal structure were prepared by controlling the thickness Alucone film.Compared with PI/ZnO composite film colored carbon fibers and Alucone film colored carbon fiber fabrics,the periodic one-dimensional photonic crystal colored carbon fiber fabrics have the lower half-width of the reflection peak,the higher reflection peak intensity,the higher color saturation and the higher mechanically stable.After heat treatment,the porous film carbon fiber fabrics with monoclinic Al₂O₃ and hexagonal ZnO were obtained,and the CFF-3?1000+400?carbon fiber fabrics form the porous fabrics which with a specific surface of 59.4 m²/g,pore diameter of 9.4 nm,and maximum adsorption capacity of 92.4 ml/g after heat treatment.After adsorbing toluene vapor,the reflection peak position of the porous carbon fabrics was red-shifted obviously.Therefore,the prepared porous carbon fiber fabrics can be used as a new visual porous gas sensor,which provides research ideas for solvent detection and chemical substance absorption.