Preparation And Properties Of Carbon Fiber/Old Corrugated Containers Fiber/Polyvinyl Alcohol (CF/OCC/PVA) Conductive Film Materials

In recent years,flexible conductive films have become the focus of industry attention due to their high electrical and thermal conversion rates,bendability and folding advantages in wearable materials.electrical heating devices and other areas of rapidly increasing demand.Carbon fiber(CF)is an inorganic fiber containing more than 90%carbon,with high strength,high modulus,low density,high temperature resistance and excellent electrical and thermal conductivity,which is widely used in reinforced polymer composites.However,the surface of carbon fiber is chemically inert,with smooth surface and lack of active functional groups,and the poor infiltration and bonding between the fiber and the matri x,which limits the properties of carbon fiber composites.Therefore,surface modification treatment of carbon fiber(CF)is needed to improve the performancc of the composites by increasing the surface roughness of the fibers and adding active functional groups.Old corrugated containers fibers(OCC)contain a large maount of cellulose,hemicellulose,and lignin,and have characteristics such as softness and curlability The introduction of carbon fibers from waste containerboard fibers into the composite material improves the interfacial bonding between the fibers and the matrix and enhances the curl properties and mechanical properties of the composite material.Polyvinyl alcohol(PVA)has strong adhesion,oil resistance,wear resistance,good water solubility and degradation properties,mechanical properties,etc.Its aqueous solution has high viscosity,excellent film-forming properties,and die film material has good mechanical properties.In this paper,CF/OCC/PVA conductive film materials were prepared by solution casting method using CF and OCC as reinforcement materials and relatively cost-effective and degradable P VA as matrix,and the effects of CF content,coupling agent type and ratio,nanoparticle type and ratio,and composite modification method on the performance of the composites were investigated.The results of the study revealed that:(I)With the increase of CF content,the electrical conductivity and mechanical properties of the film material were significantly enhanced.When the CF content was 25%,the film material had the best overall performance,with a conductivity of 1.17 S/cm and a tensile strength of 43.8 MPa;the CF was interwoven to form a dense and dense conductive network structure.Therefore,when the CF content was 25%,the CF/OCC/PVA conductive film material had the best comprehensive performance.Therefore,the CF/OCC/PVA conductive film material was prepared with 25%CF content and 75%OCC fiber content.(2)The conductivity,mechanical properties,and wettability of CF/OCC/PVA conductive film materials were significantly improved after CF modification treatment with coupling agents.After modification of CF with silane coupling agent γ-aminopropyltriethoxysilane(KH550),the electrical conductivity of CF-KH550/OCC/PVA film materials increased 312 times;the tensile strength of the modified film materials all reached the best at 1.5%,and after modification withγ-mercaptopropyltrimethoxysilane(KH590),the CF-KH550/OCC/PVA film materials.The tensile strength was increased by 65.1%;the surface roughness and wettability of the fibers were greatly improved,and the surface active functional groups were increased.Therefore,the silane coupling agent modification had improved and enhanced the properties of CF and CF/OCC/PVA conductive film materials.(3)The conductivity,mechanical properties and wettability of CF/OCC/PVA film materials were significantly improved after the modification of CF with nanoparticles.The conductivity of the modified CF/OCC/PVA film materials all reached the best at 0.5%,and the conductivity of CF-TiO2/OCC/PVA film materials increased 293 times after the modification of CF with nanoparticles of titanium dioxide(TiO2);the tensile strength of the modified film materials increased significantly,and the tensile strength of CF-ZrO2/OCC/PVA film materials increased 62.9%after the modification of CF with nanoparticles of zirconium dioxide(ZrO2)/PVA film material increased the tensile strength by 62.9%;CF surface was coated with more nanoparticles,and the surface roughness and wettability were significantly enhanced.Therefore,the nanoparticle modification treatment had a good enhancement and improvement effect on the properties of CF and CF/OCC/PVA conductive film materials.(4)The conductivity,mechanical properties,and wettability of the film materials were significantly improved after the composite modification treatment of CF with coupling agent and nanoparticles.482 times higher conductivity of CF-KH550-ZrO2/OCC/PVA conductive film materials after the composite modification treatment of CF with KH550 and ZrO2;the mechanical properties of the modified film materials were significantly enhanced,and the tensile strength of CF-KH560-TiO2/OCC/PVA conductive film materials was increased by 61.7%after the composite modification treatment of CF with KH560 and TiO2 composite modification treatment of CF,CF-KH560-TiO2/OCC/PVA conductive film material increased the tensile strength by 61.7%;CF surface attached coupling agent particles and nanoparticles,significantly improve the fiber surface roughness and polarity.Therefore,the composite modification treatment further significantly enhanced the electrical conductivity,mechanical properties,etc.of the film materials compared with the coupling agent and nanoparticles alone.This paper had completed a systematic study of CF/OCC/PVA conductive film composites from preparation,modification and comprehensive performance,which can provide a certain reference for the research and development of special fiber/old corrugated containers/polymer based conductive film materials.