Composite fiber and method of manufacturing same

Abstract

Disclosed is a composite fiber including a substrate and a MXene disposed inside the substrate. The substrate contains a polymer and has a fiber shape. Since the MXene content is controlled to be in an optimum range, the mechanical properties, mechanical stability, and oxidation stability of the composite fiber are maximized.

What is claimed is: 
     
         1 . A composite fiber comprising:
 a substrate comprising a polymer and having a fiber shape; and   a MXene disposed inside the substrate,   wherein the composite fiber comprises the Mxene in an amount of about 10% to 40% by weight based on the total weight of the composite fiber.   
     
     
         2 . The composite fiber of  claim 1 , wherein the polymer comprises polyacrylonitrile (PAN). 
     
     
         3 . The composite fiber of  claim 1 , wherein the MXene comprises a stack comprising two or more nanosheets, wherein the polymer is disposed between the nanosheets. 
     
     
         4 . The composite fiber of  claim 1 , wherein the polymer and the MXene are bonded by electrostatic interaction. 
     
     
         5 . The composite fiber of  claim 1 , wherein a cross section of the composite fiber has a circular shape, a hollow circular shape, a solid oval shape, a hollow oval shape, a hollow shape, or a line shape. 
     
     
         6 . The composite fiber of  claim 1 , wherein the composite fiber has an electrical conductivity in a range of about 10 S/cm and 200 S/cm, a tensile strength in a range of about 10 MPa to 200 MPa, and a density of about 1.0 g/cm to 2.5 g/cm. 
     
     
         7 . A method of manufacturing a composite fiber, the method comprising:
 preparing a first dispersion solution comprising a MXene and a first solvent;   preparing a second dispersion solution comprising a polymer and a second solvent;   obtaining an admixture comprising the first dispersion solution and the second dispersion solution; and   obtaining a composite fiber by wet spinning the admixture,   wherein the composite fiber comprises a substrate comprising a polymer having a fiber shape; and a MXene disposed in the substrate, wherein the composite fiber comprises the MXene in an amount of about 10% to 40% by weight based on the total weight of the composite fiber.   
     
     
         8 . The method of  claim 7 , wherein the first solvent comprises one or more selected from the group consisting of 1-methyl-2-pyrrolidinone-m-Methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), dimethylacetamide (DMAc), and dimethyl sulfoxide (DMSO). 
     
     
         9 . The method of  claim 7 , wherein a concentration of the MXene in the first dispersion solution ranges from about 10 mg/mL to about 45 mg/mL. 
     
     
         10 . The method of  claim 7 , wherein the second solvent comprises one or more selected from the group consisting of 2-methyl-2-pyrrolidinone-m-Methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), dimethylacetamide (DMAc), and dimethyl sulfoxide (DMSO). 
     
     
         11 . The method of  claim 7 , wherein a concentration of the polymer in the second dispersion solution ranges from about 50 mg/mL to about 500 mg/mL. 
     
     
         12 . The method of  claim 7 , wherein the admixture comprises the MXene in an amount of 10% to 60% by weight based on the total weight of the admixture. 
     
     
         13 . The method of  claim 7 , wherein the composite fiber is obtained in a manner to wet spin the admixture into a coagulation fluid, and
 the coagulation fluid comprises one or more selected from the group consisting of water, acetone, methyl alcohol, ethyl alcohol, isopropyl alcohol, methyl acetate, ethyl acetate, propyl acetate, acetic acid, acetonitrile, 1-Methyl-2-pyrrolidinone-N-Methyl-2-pyrrolidone (NMP), N,N-Dimethylformamide (DMF), dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), and tetrahydrofuran (THF).   
     
     
         14 . The method of  claim 13 , wherein the coagulation fluid has a temperature in a range of from about 20° C. to 60° C. 
     
     
         15 . The method of  claim 7 , wherein the wet spinning is performed using a spinneret having a diameter in a range of about 10 μm to 1500 μm. 
     
     
         16 . The method of  claim 7 , further comprising heat-treating the composite fiber in an inert gas atmosphere at a temperature in a range of about 400° C. to 600° C. 
     
     
         17 . The method of  claim 7 , wherein the polymer comprises polyacrylonitrile (PAN). 
     
     
         18 . The method of  claim 7 , wherein the MXene comprises a stack of two or more nanosheets, wherein the polymer is disposed between the nanosheets. 
     
     
         19 . The method of  claim 7 , wherein the polymer and the MXene are bonded by electrostatic interaction. 
     
     
         20 . The method of  claim 7 , wherein a cross section of the composite fiber comprises a circular shape, a hollow circular shape, a solid oval shape, a hollow oval shape, a hollow shape, or a line shape, and
 wherein the composite fiber has an electrical conductivity in a range of about 10 S/cm and 200 S/cm, a tensile strength in a range of about 10 MPa to 200 MPa, and a density of about 1.0 g/cm to 2.5 g/cm.