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-11390966-B2
Application number	US-201816235508-A
Country	US
Kind code	B2
Filing date	Dec 28, 2018
Priority date	Dec 7, 2018
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

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

What is claimed is:

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,
wherein the pores of the hydrogel fiber are filled by immersing, at 10° C. to 50° C. for 1 hour to 5 hours, the hydrogel fiber in a solution in which the second aromatic monomer is dissolved.

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,
wherein the pores of the hydrogel fiber are filled by immersing, at 10° C. to 50° C. for 1 hour to 5 hours, the hydrogel fiber in a solution in which the second aromatic monomer is dissolved.

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 comprising a graphene-based compound modified with a first aromatic polymer and a second aromatic polymer filled in pores of the hydrogel fiber,
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, and
wherein (I D /I G ) C of the graphene composite modified with the first aromatic polymer is 1 or less.

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 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.

12. A graphene-based carbon fiber comprising a graphene-based compound and graphitic nitrogen, having an electrical conductivity of 1×10 5 S/m or more and 1×10 6 S/m or less, wherein an inside of the graphene-based carbon fiber is formed of a dense texture which substantially does not include pores.

13. The graphene-based carbon fiber of claim 12 , wherein a tensile strength is 300 MPa or more.

14. The graphene-based carbon fiber of claim 12 , wherein the graphene-based carbon fiber contains 2 to 10 atom % of the graphitic nitrogen.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Kim Sang Ouk
• Kim In Ho

Classifications

• C08G73/0672

  with only one nitrogen atom in the ring · CPC title

• C01B32/194

  After-treatment · CPC title

• D01D1/02

  Preparation of spinning solutions · CPC title

• C08G2261/77

  grafting · CPC title

• D01F9/20 Primary

  from polyaddition, polycondensation or polymerisation products (D01F9/145, D01F9/16, D01F9/18 take precedence) · CPC title