Porous electrospun fiber and preparation method thereof

Patent metadata

Field	Value
Publication number	US-9322115-B2
Application number	US-201113880000-A
Country	US
Kind code	B2
Filing date	Aug 26, 2011
Priority date	Oct 29, 2010
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

The present invention relates to a porous electrospun fiber with uniform minute pores and very large surface area, and thus porous electrospun fiber can be preferably applicable to various uses that need mesoporous materials, and a method of preparing the same. The porous electrospun fiber comprises an acrylamide-based polymer.

First claim

The invention claimed is:

1. A porous electrospun fiber comprising an acrylamide-based polymer comprising at least one repeating unit represented by Chemical Formula 1:

In Chemical Formula 1,
n is an integer of 15 to 1,800,
R is hydrogen or methyl; and
R′ is X,

wherein X is —Z—R″; Y is alkylene having 1 to 10 carbon atoms; Z is arylene having 6 to 20 carbon atoms; and R″ is a linear or branched hydrocarbon having 10 to 20 carbon atoms, or a linear or branched perfluorohydrocarbon having 10 to 20 carbon atoms.

2. The porous electrospun fiber of claim 1 , wherein the fiber has a diameter of 200 nm to 10 μm.

3. The porous electrospun fiber of claim 1 , wherein the fiber includes a plurality of pores having a diameter of 20 to 500 nm on the surface.

4. The porous electrospun fiber of claim 1 , wherein the acrylamide-based polymer is a crystalline polymer.

5. The porous electrospun fiber of claim 1 , wherein the acrylamide-based polymer has a number-average molecular weight of 5,000 to 500,000.

6. A method of preparing a porous electrospun fiber comprising the steps of:
dissolving an acrylamide-based polymer comprising at least one repeating unit represented by Chemical Formula 1 in an organic solvent to obtain a polymer solution; and
performing electrospinning the polymer solution;

In Chemical Formula 1,
n is an integer of 15 to 1,800,
R is hydrogen or methyl; and
R′ is X,

wherein X is —Z—R″; Y is alkylene having 1 to 10 carbon atoms; Z is arylene having 6 to 20 carbon atoms; and R″ is a linear or branched hydrocarbon having 10 to 20 carbon atoms, or a linear or branched perfluorohydrocarbon having 10 to 20 carbon atoms.

7. The method of preparing a porous electrospun fiber of claim 6 , wherein the organic solvent comprises at least one nonpolar solvent selected from the group consisting of n-hexane, cyclohexane, benzene, toluene, chlorobenzene, dichlorobenzene, methylenechloride and 1,-dichloroethan; or at least one polar solvent selected from the group consisting of acetone, chloroform, tetrahydrofuran (THF), dioxane, monoglyme, diglyme, dimethylformamide (DMF), dimethylsulphoxide (DMSO) and dimethylacetamide (DMAC).

8. The method of preparing a porous electrospun fiber of claim 6 , wherein the polymer is dissolved in the organic solvent in an amount of 10 to 40 wt %.

9. The method of preparing a porous electrospun fiber of claim 6 , wherein the electrospinning is performed under the condition of applied voltage of 10 to 30 kV.

10. The method of preparing a porous electrospun fiber of claim 6 , wherein the electrospinning is performed at the electrospinning apparatus comprising a nozzle that has a diameter of 20 to 30 gauge and has a distance of 10 to 20 cm from a fiber collector.

11. The method of preparing a porous electrospun fiber of claim 6 , wherein the electrospinning is performed at a spinning rate of 5 to 20 mL/min.

Assignees

• Han Yang-Kyoo
• Kim Su-Hwa
• Lee Je-Gwon
• Lg Chemical Ltd
• Iucf Hyu

Inventors

• Han Yang-Kyoo
• Kim Su-Hwa
• Lee Je-Gwon

Classifications

• D01F6/38 Primary

  comprising unsaturated nitriles as the major constituent · CPC title

• Y10T428/298

  Physical dimension · CPC title

• C08F22/38

  Amides · CPC title

• D01D5/247

  Discontinuous hollow structure or microporous structure · CPC title

• D01D5/0007 Primary

  Electro-spinning (non-woven fabrics produced by electro-spinning D04H1/728) · CPC title