Composite fiber and method for manufacturing the same

Abstract

A composite fiber includes a core comprising a MXene polymer fiber with MXene distributed as stacked nanosheets within a first polymer, a first coating layer of benzoic acid-based organic molecules on the MXene polymer fiber, a second polymer in fiber form on the first coating layer, and a second coating layer of a thermoplastic polymer with a thermal strain of about 80° C. or higher. The method for manufacturing the composite fiber involves mixing MXene and a first polymer, depositing a first coating layer, plying and twisting with a second polymer, and applying a second coating layer. The first polymer may include polyacrylonitrile (PAN), and the second polymer may include materials such as nylon or polyethylene terephthalate (PET). The process includes steps such as wet spinning and surface treatment at high temperatures.

What is claimed is: 
     
         1 . A composite fiber comprising:
 a MXene polymer fiber comprising a first polymer comprising d MXene;   a first coating layer on the MXene polymer fiber;   a second polymer and disposed on a surface of the first coating layer; and   a second coating layer on the first coating layer and the second polymer.   
     
     
         2 . The composite fiber of  claim 1 , wherein the first polymer comprises polyacrylonitrile (PAN). 
     
     
         3 . The composite fiber of  claim 1 , wherein a content of the MXene is about 20 to 40 wt % based on a total weight of the MXene polymer fiber. 
     
     
         4 . The composite fiber of  claim 1 , wherein, in the MXene polymer fiber, the first polymer and the MXene are combined by an electrostatic interaction. 
     
     
         5 . The composite fiber of  claim 1 , wherein the first coating layer comprises benzoic acid-based organic molecules. 
     
     
         6 . The composite fiber of  claim 1 , wherein fineness of the second polymer is about 50 to 100d. 
     
     
         7 . The composite fiber of  claim 1 , wherein the MXene polymer fiber coated with the first coating layer and the second polymer have a structure in which twists are repeated. 
     
     
         8 . The composite fiber of  claim 1 , wherein the second coating layer is a thermoplastic polymer having a thermal strain of about 80° C. or higher and a degree of polymerization of about 1,000 to 1,000,000. 
     
     
         9 . The composite fiber of  claim 1 , wherein, based on a total weight of the composite fiber, the MXene polymer fiber is included in an amount of about 0.5 to 2 wt %, the second polymer is included in an amount of about 96 to 99 wt %, and the second coating layer is included in an amount of about 0.8 to 3.5 wt %. 
     
     
         10 . The composite fiber of  claim 1 , wherein the composite fiber has tensile strength of about 90 MPa or more and elongation of about 17% or more. 
     
     
         11 . A composite fiber comprising:
 a core comprising a MXene polymer fiber, where the MXene is distributed within a first polymer as stacked nanosheets with the first polymer filling spaces between the nanosheets;   a first coating layer applied on the MXene polymer fiber, the first coating layer comprising benzoic acid-based organic molecules;   a second polymer having a shape of a fiber and disposed on a surface of the first coating layer; and   a second coating layer on the first coating layer and the second polymer, the second coating layer comprising a thermoplastic polymer having a thermal strain of about 80° C. or higher and a degree of polymerization of about 1,000 to 1,000,000.   
     
     
         12 . The composite fiber of  claim 11 , the first polymer comprises polyacrylonitrile (PAN), and the second polymer comprises nylon, polyethylene terephthalate (PET), polyethylene (PE), aramid, cotton, polyimide (PI), polyacrylic acid (PAA), or a combination thereof. 
     
     
         13 . A method for manufacturing a composite fiber, the method comprising:
 mixing MXene and a first polymer to obtain a MXene polymer fiber;   depositing a first coating layer on the MXene polymer fiber;   a plying and twisting operation of plying and twisting the MXene polymer fiber and the second polymer to obtain a ply yarn; and   obtaining a second coating layer on the plied yarn.   
     
     
         14 . The method of  claim 13 , wherein
 the obtaining of the MXene polymer fiber comprises:   preparing a first dispersion comprising MXene and a first solvent;   preparing a second dispersion comprising a first polymer and a second solvent;   obtaining a mixed solution comprising the first dispersion and the second dispersion; and   a wet spinning operation of wet spinning the mixed solution to obtain a MXene polymer fiber.   
     
     
         15 . The method of  claim 14 , wherein the first solvent and the second solvent are each independently at least one selected from the group consisting of methylpyrrolidone (1-methyl-2-pyrrolidinone-N-methyl-2-pyrrolidone (NMP)), dimethylformamide (N, N-dimethylformamide (DMF)), dimethylacetamide (DMAc), and dimethyl sulfoxide (DMSO). 
     
     
         16 . The method of  claim 13 , wherein the MXene polymer fiber comprises a substrate comprising a first polymer and having a shape of a fiber and MXene distributed inside the substrate, and comprises about 20 to 40 wt % of the MXene. 
     
     
         17 . The method of  claim 13 , wherein the obtaining of the first coating layer comprises immersing the MXene polymer fiber in a surface treatment solution comprising benzoic acid-based organic molecules. 
     
     
         18 . The method of  claim 17 , wherein the immersing is performed at about 80° C. or higher for about 30 minutes or longer. 
     
     
         19 . The method of  claim 13 , wherein the plying and twisting comprises plying the MXene polymer fiber and the second polymer and then rotating and twisting the entire fiber. 
     
     
         20 . The method of  claim 13 , wherein the obtaining of the second coating layer comprises immersing the plied yarn in a surface treatment solution comprising the second polymer and then performing drying.