Fabrication And Properties Of Superhydrophobic,Flame-retardant And Conductive Textiles

Textiles are one of the most commonly used materials in daily life due to their softness,breathability and durability which are widely used in clothing fabrics,furnishing fabrics and industrial fabrics,as well as an ideal substrate for flexible wearable electronics.However,textiles are easily contaminated due to their inherent hydrophilicity,which brings a lot of inconvenience in practical applications.Additionally,textiles have great safety hazards due to their flammability,which severely limits their application in many fields.In recent years,functionalization of textiles is a hot spot in current research.However,textiles with single function are difficult to cope with various complex application scenarios.Therefore,it is particularly important to establish a method for preparing multifunctional textiles.In this thesis,studies on superhydrophobic textiles,flame-retardant textiles and other functional textiles were reviewed and analyzed,then research was detailed.Cotton fabrics as substrates were firstly treated with carbon nanotubes(CNTs)by layer-by-layer(LbL)assembly,which were used as conductive materials and nanostructural units to construct nanostructure on the surface of the microscale fibers.Then,the CNTs treated fabrics were dip-coated with flame retardant and hydrophobic agent to prepare superhydrophobic,flame-retardant and conductive textiles.(1)CNTs were adsorbed on the surface of cotton fibers via LbL assembly,and then finished with Pyrovatex CP new as a flame retardant and CTC-UFC02 as a water-repellent to obtain a cotton fabric with three functions of superhydrophobicity,flame retardancy and conductivity.Scanning electron microscope(SEM)was used to observe the morphology of the modified fibers.The contact angles were measured using a video optical contact angle system.Flame retardant properties of coated cotton fabric were measured by Vertical Fabric Burning Behavior Tester.Electrical resistivity measurements were performed by a multifunctional digital four-probe tester.Chronoamperometry was used to test the sensing performance of the modified fabric.The effects of the number of assembly layers on the surface morphology,hydrophobicity and electrical conductivity of the fabrics were investigated.The effects of the amount of flame retardant on the flammability properties of the fabric were studied.The effects of the amount of water-repellent and the curing time on the hydrophobicity of the fabrics were explored.Superhydrophobic stability of the coated cotton fabrics was investigated by mechanical rubbing,UV irradiation,impregnation with acid/alkali solution and common organic solvents.The results showed that the superhydrophobicity of the modified fabrics could withstand 72 hours of acid,alkali and organic solvent impregnation,exhibiting good chemical resistance.In addition,the fabric exhibited a certain degree of stress stimulation responsiveness and stability in conductive sensing application.(2)CNTs and ammonium polyphosphate(APP)as flame retardant were sequentially assembled on the surface of cotton fibers to construct micro-nano roughness on the microscale fibers and simultaneously impart conductivity and flame retardancy to the fabrics,followed by post-treatment with poly(dimethylsiloxane)(PDMS)to fabricate superhydrophobic,flame-retardant and conductive textiles.The surface morphology of the fiber was examined by SEM.The wettability of the coated fabric was tested by a video optical contact angle system.Fame-retardant properties of the coated cotton fabric were detected by vertical burning test.The thermal stability of the fabric was analyzed by a simultaneous thermal analyzer.Electrical resistivity was measured by a multifunctional digital four-probe tester.Chronoamperometry was used to test the sensing performance of the modified fabric.The effects of the concentration of PDMS and the number of the assembly layers on the morphology,hydrophobicity,thermal stability and electrical resistivity of the modified cotton fabric were explored.The results show that when the PDMS concentration is 1 wt%and the number of assembled layers is 10,the comprehensive properties of textiles of superhydrophobicity,flame retardancy and electrical conductivity are the best.The resulting fabrics maintained superhydrophobicity after 72 hours of acid,alkali,salt,organic solvent impregnation,and 144 hours of UV irradiation,2000 abrasion cycles and 900 minutes of washing,indicating excellent superhydrophobic stability.Besides,the fabric exhibited a certain degree of stress stimulation responsiveness and stability in conductive sensing application.