Design,Preparation And Properties Of Flexible Transparent Conductive Thin Films

Flexible transparent conductive film is widely used in the fields of outdoor heating materials,electric heating devices,and snow removal equipment because of its advantages of high electrothermal conversion,folding and winding and high generated temperature.Natural cellulose with renewable,economic,green and easy to process is a good raw material for making flexible film.However,the natural cellulose fibers with rough and long seriously affect the properties of the films.In this paper,we have reported three solvent methods for the preparation of regenerated cellulose and different conductive media were further studied based on the properties of the prepared regenerated cellulose.(1)Microwave assisted filament separation and dielectric transfer method was used to prepare flexible transparent conductive films.In the microwave environment,a transparent film with high transparency(~85%),low surface roughness(4.73 nm(Rq)and 3.74 nm(Ra))and high mechanical strength(46 MPa)was made by using ionic liquid to dissolve the originally cellulose film.Then the silver nanowire solution was filtered through the prepared transparent film to obtain the flexible transparent conductive film.This film with high degree(65%)and good conductivity(5.1/sq)greatly meets the target requirement.(2)Full dissolution and mixing method was used to prepare flexible transparent conductive films.The regenerated cellulose solution with the 32.33%fine fiber can be obtained using DMAc/LiCl as a cellulose solution system,the average width and length of the regenerated cellulose are 12.09 um and 0.84mm.Transparent film made from regenerated cellulose can reach to 63%transmittance.When the content of carbon fiber in transparent conductive heat film is 8%,the response time of flexible transparent conductive heat film is 12s and the generated temperature is 59.9?.It is proved that the flexible transparent conductive film prepared by this method not only has very good mechanical properties,but also has a simple preparation process,high temperature and using security.(3)Full dissolution and dielectric transfer method was used to prepare flexible transparent conductive films.The N-methyl morpholine-N-oxide system was used as the cellulose solution system to prepare the regenerated cellulose.The regenerated cellulose solution with the 66.98%fine fiber can be obtained using N-methyl morpholine-N-oxide system,the average width and length of the regenerated cellulose are 11.45 um and 0.66mm.The transparency of the film prepared by centrifugation regenerated cellulose supernatant can reach to 88%and the mechanical strength can reach 30MPa.When the content of carbon nanotubes is 0.2g/m~2,the thermal response time of samples is about 15s and the stable generated temperature can reach to 50.5?.In this paper,microwave assisted filament separation and dielectric transfer method,full dissolution and mixing method,full dissolution and dielectric transfer method were used to prepare flexible transparent conductive film.By using different cellulose solvents,different properties of regenerated cellulose and transparent thin films were obtained.According to their properties and characteristics,different conductive media and processes were selected to prepare flexible transparent conductive film.