Polymer-graphene liquid crystal fiber and a carbon fiber produced by the same and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2020181808-A1
Application number	US-201816235508-A
Country	US
Kind code	A1
Filing date	Dec 28, 2018
Priority date	Dec 7, 2018
Publication date	Jun 11, 2020
Grant date	—

Abstract

Provided is a manufacturing method of a graphene-based liquid crystal fiber including: polymerizing a first aromatic monomer on a graphene-based compound to prepare a graphene composite in which a first aromatic polymer is surface-polymerized on the graphene-based compound; wet-spinning the graphene composite to manufacture a hydrogel fiber; and polymerizing a second aromatic monomer on the hydrogel fiber to fill pores of the hydrogel fiber with a second aromatic polymer.

First claim

1 . A manufacturing method of a graphene-based liquid crystal fiber comprising:
(a) polymerizing a first aromatic monomer on a graphene-based compound to prepare a graphene composite in which a first aromatic polymer is surface-polymerized on the graphene-based compound; (b) wet-spinning the graphene composite to manufacture a hydrogel fiber; and (c) polymerizing a second aromatic monomer on the hydrogel fiber to fill pores of the hydrogel fiber with a second aromatic polymer.

2 . The manufacturing method of a graphene-based liquid crystal fiber of claim 1 , wherein a weight ratio of the graphene-based compound to the first aromatic monomer is 1:0.01 to 1:10.

3 . The manufacturing method of a graphene-based liquid crystal fiber of claim 1 , wherein in a process of (a), the first aromatic polymer which is surface-polymerized on the graphene-based compound forms a surface layer with a thickness of 0.1 to 1 nm.

4 . The manufacturing method of a graphene-based liquid crystal fiber of claim 1 , wherein in a process of (a), the surface polymerization of the first aromatic monomer is oxidation polymerization of the first aromatic monomer on a surface of the graphene-based compound.

5 . The manufacturing method of graphene-based liquid crystal fiber of claim 1 , wherein a weight ratio of the graphene composite to the second aromatic monomer is 1:0.1 to 1:100.

6 . The manufacturing method of graphene-based liquid crystal fiber of claim 1 , wherein the first aromatic monomer and the second aromatic monomer are a phenolic compound containing an amine group.

7 . A manufacturing method of a graphene-based carbon fiber, comprising:
(a) polymerizing a first aromatic monomer on a graphene-based compound to prepare a graphene composite in which a first aromatic polymer is surface-polymerized on the graphene-based compound; (b) wet-spinning the graphene composite to manufacture a hydrogel fiber; and (c) filling pores of the hydrogel fiber with a second aromatic polymer to manufacture a graphene-based liquid crystal fiber; and (d) carbonizing the graphene-based liquid crystal fiber.

8 . The manufacturing method of a graphene-based carbon fiber of claim 7 , wherein filling comprises polymerizing a second aromatic monomer on the hydrogel fiber to fill pores of the hydrogel fiber with the second aromatic polymer.

9 . A graphene-based liquid crystal fiber comprising: a hydrogel fiber a graphene-based compound modified with a first aromatic polymer and a second aromatic polymer filled in pores of the hydrogel fiber.

10 . The graphene-based liquid crystal fiber of claim 9 , wherein the first aromatic monomer and the second aromatic monomer are a phenolic compound containing a nitrogen atom in a structural unit.

11 . The graphene-based liquid crystal fiber of claim 9 , wherein I D /I G of the graphene-based compound and the graphene-based compound modified with the first aromatic polymer satisfies the following Equation 1:
( I D /I G ) G /( I D /I G ) C <1  [Equation 1]
wherein I D /I G is a measure of relative crystallinity which represents density of defects, and is calculated as a ratio of a maximum intensity value of a peak of an absorption region at 1350±10 cm 1 (I D ) to a maximum intensity value of a peak of an absorption region at 1590±10 cm −1 (I G ), in Raman spectroscopic analysis, (I D /I G ) G refers to I D /I G of the graphene-based compound, and (I D /I G ) C refers to I D /I G of a graphene composite modified with the first aromatic polymer.

12 . The graphene-based liquid crystal fiber of claim 9 , wherein adhesion of a graphene composite modified with the first aromatic polymer satisfies the following Equation 2:
F C /F G >2  [Equation 2]
wherein F G refers to adhesion between the graphene-based compounds, and F C refers to adhesion of the graphene composite modified with the first aromatic polymer.

13 . A graphene-based carbon fiber comprising a graphene-based compound and graphitic nitrogen, having an electrical conductivity of 1×10 4 S/m or more.

14 . The graphene-based carbon fiber of claim 13 , wherein a tensile strength is 300 MPa or more.

15 . The graphene-based carbon fiber of claim 13 , wherein the graphene-based carbon fiber contains 2 to 10 atom % of the graphitic nitrogen.

16 . The graphene-based carbon fiber of claim 13 , wherein an inside of the graphene-based carbon fiber is formed of a dense texture which substantially does not include pores.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Kim Sang Ouk
• Kim In Ho

Classifications

• C08K3/042

  Graphene or derivatives, e.g. graphene oxides · CPC title

• C08G2261/964

  coating of inorganic particles · CPC title

• C08G2261/43

  Chemical oxidative coupling reactions, e.g. with FeCl3 · CPC title

• C08G2261/3221

  containing one or more nitrogen atoms as the only heteroatom, e.g. pyrrole, pyridine or triazole · CPC title

• C08G2261/77

  grafting · CPC title