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Graphene conjugate fiber and method for manufacturing same

a graphene and conjugate technology, applied in the field of flexible graphene composite fibers, can solve the problems of limiting the maximum mechanical properties of graphene, and achieve the effect of superior mechanical properties

Inactive Publication Date: 2014-01-09
IUCF HYU (IND UNIV COOP FOUND HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a graphene composite fiber that has superior mechanical properties compared to other graphene products like papers, films, and flexible graphite. It can be easily formed into knots, springs, or woven into fabrics. This fiber is simple and economical to mass-produce and can be extended to tens of meters in a continuous process. Therefore, it is ideal for industrial applications.

Problems solved by technology

A major challenge for graphene structures with high strength and toughness is to maintain the inherent active surface of graphene by preventing restacking of graphene tending to form close-packed layer structures.
The dense layered structure of graphene is an obstacle in achieving maximum mechanical properties owing to the short length of graphene that reduces the van der Waals force and tensile strength between graphene layers (by 1% or less).

Method used

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  • Graphene conjugate fiber and method for manufacturing same
  • Graphene conjugate fiber and method for manufacturing same
  • Graphene conjugate fiber and method for manufacturing same

Examples

Experimental program
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Effect test

example1

Preparation of Solution of Graphene (RCCG) Chemically Converted by Reduction

[0045]In accordance with the method illustrated in FIG. 1, RCCG was dispersed in dimethylformamide (DMF) in the presence of an appropriate amount of triethylamine to obtain a stable graphene dispersion. Several grams of RCCG was obtained by reducing an aqueous dispersion of CCG with excess hydrazine at 95° C. over 2 h in accordance with previously reported methods (Li, D., Muller, M. B., Gilje, S., Kaner, R. B. & Wallace, G. G. Processable aqueous dispersions of graphene nanosheets. Nature Nanotech. 3, 101 (2008)). As a result of the reduction reaction, the graphene aggregated in the aqueous solution. The graphene aggregates were acidified with dilute sulfuric acid under vigorous stirring to a pH of 2 or less, and transferred to a sintered funnel. The aggregates were washed with a large amount of Milli-Q water on the funnel until the pH reached about 7. The filtered material was dried under vacuum at 70° C. ...

example2

Production of Graphene Flakes / PVA Composite Fiber

[0046]The solvent (DMF) of the graphene flake dispersion was exchanged with distilled water by centrifugation. The G / F aqueous solution was mixed with sodium dodecyl benzene sulfonate (SDBS) by ultrasonication.

[0047]The graphene dispersion was slowly injected into a coagulation bath containing PVA (molecular weight=89,000-124,000, degree of hydrolysis=˜99%) through a syringe (26 gauge) and wet spun to continuously produce a uniform graphene / PVA fiber.

[0048]After dipping in a coagulation bath for one day, the graphene / PVA fiber was thoroughly washed with distilled water and vertically dried in air at room temperature. The graphene / PVA fiber was annealed at 150° C. and dipped in methanol for 8 h to obtain thermally drawn, methanol-treated GF / PVA. The annealing and methanol treatment increased the crystallinity of the PVA.

[0049]Experimental Example: Characterization of the Graphene Composite Fiber

[0050]The graphene composite fiber was su...

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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.

Description

TECHNICAL FIELD [0001]The present invention relates to a polymer composite fiber including graphene and a method for producing the same. More specifically, the present invention relates to a flexible graphene composite fiber with outstanding mechanical properties and a method for producing the graphene composite fiber.BACKGROUND ART[0002]Graphene is a two-dimensional nanostructure of covalently bonded carbon atoms and exhibits surprising mechanical, electrical, and thermal properties. Graphene flakes consist of single or several graphene sheets exfoliated from graphite. Graphene flakes have been reconstituted into bulky structures that have a modulus exceeding that of flexible graphite while possessing high strength.[0003]A major challenge for graphene structures with high strength and toughness is to maintain the inherent active surface of graphene by preventing restacking of graphene tending to form close-packed layer structures. Single-layer graphene or a graphene flake has a wri...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D01F9/12D01F11/14
CPCD01F9/12D01F11/14B82Y30/00D01D1/02D01D5/06D01D10/02D01F1/10D01F6/14D01F6/16D02J13/00Y10T428/2918D01F8/04D01F8/18D06M13/02
Inventor KIM, SEON JEONGSHIN, MIN KYOONKIM, SHI HYEONG
Owner IUCF HYU (IND UNIV COOP FOUND HANYANG UNIV)
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