Graphene conjugate fiber and method for manufacturing same

Abstract

The present invention relates to a graphene conjugate fiber and a method for manufacturing same, and more particularly, to a conjugate fiber including graphene and a polymer, wherein a wrinkled structure of the graphene is maintained in a fiber state. The graphene conjugate fiber manufactured thereby has superior mechanical properties, is flexible, and has high utility by being manufactured as a fiber.

1 . A graphene composite fiber comprising graphene and a polymer wherein the wrinkled structure of the graphene is maintained unchanged. 
     
     
         2 . The graphene composite fiber according to  claim 1 , wherein the contents of the graphene and the polymer in the composite fiber are from 20 to 90% by weight and from 10 to 80% by weight, respectively. 
     
     
         3 . The graphene composite fiber according to  claim 1 , wherein the length of the graphene in the composite fiber is from 100 to 1000 nm. 
     
     
         4 . The graphene composite fiber according to  claim 1 , wherein the polymer is selected from polyvinyl alcohol and poly(methyl methacrylate). 
     
     
         5 . The graphene composite fiber according to  claim 1 , wherein the graphene composite fiber is flexible. 
     
     
         6 . The graphene composite fiber according to  claim 1 , wherein the graphene composite fiber is capable of being formed into knot and spring structures and being woven into a fabric. 
     
     
         7 . The graphene composite fiber according to  claim 1 , wherein the composite fiber has a toughness of 1 to 5.5 MJ/m 3 . 
     
     
         8 . The graphene composite fiber according to  claim 1 , wherein the composite fiber has a mechanical strength of 100 to 300 MPa. 
     
     
         9 . The graphene composite fiber according to  claim 1 , wherein the composite fiber has a modulus of elasticity of 5 to 30 GPa. 
     
     
         10 . The graphene composite fiber according to  claim 1 , wherein the composite fiber has a storage modulus of 1 to 10 GPa at 20 to 200° C. 
     
     
         11 . A method for producing a graphene composite fiber, the method comprising
 a) dispersing graphene and a surfactant in a solvent to prepare a dispersion, and   b) incorporating the dispersion into a polymer solution, wet spinning the resulting solution, followed by drying to produce a fiber.   
     
     
         12 . The method according to  claim 11 , further comprising c) annealing the fiber obtained in b) at a high temperature of 140 to 160° C. 
     
     
         13 . The method according to  claim 11 , further comprising c′) dipping the fiber obtained in b) in methanol or acetone to improve the degree of crystallization of the fiber. 
     
     
         14 . The method according to  claim 11 , wherein the graphene is chemically reduced graphene. 
     
     
         15 . The method according to  claim 11 , wherein the graphene is chemically reduced graphene with acid functional groups. 
     
     
         16 . The method according to  claim 15 , wherein the chemically reduced graphene is prepared by reducing an aqueous dispersion of graphene with hydrazine at 90 to 100° C. for 1 to 24 hours. 
     
     
         17 . The method according to  claim 11 , wherein the surfactant is selected from sodium dodecyl benzene sulfonate (SDBS), sodium dodecyl sulfonate (SDS), Triton X-100, and cetyltrimethylammonium bromide (CTAB).