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Hollow fiber, dope solution composition for forming a hollow fiber, and method for manufacturing a hollow fiber using the same

A fiber and hollow technology, applied in the manufacture of hollow filaments, chemical instruments and methods, single-component synthetic polymer rayon, etc., can solve problems such as difficulty in obtaining separation ability and permeability, and decline in membrane performance

Inactive Publication Date: 2011-06-15
IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, commercially available polymeric materials for gas separation with membrane properties (in the case of air separation, oxygen permeability of 1 Barrer or higher and oxygen / nitrogen selectivity of 6.0 or higher ) is limited to a few types
This is because: there are considerable limitations in improving polymer structures, and the greater compatibility between permeability and selectivity makes it difficult to obtain separation and permeability beyond predetermined upper bounds
[0014] Furthermore, conventional polymeric membrane materials have limitations and disadvantages in permeation and separation properties because they undergo decomposition and aging after long-term exposure to high-pressure and high-temperature processes or after exposure to gas mixtures containing hydrocarbons, aromatics, and polar solvents, thus causing a considerable decrease in the inherent membrane performance

Method used

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  • Hollow fiber, dope solution composition for forming a hollow fiber, and method for manufacturing a hollow fiber using the same
  • Hollow fiber, dope solution composition for forming a hollow fiber, and method for manufacturing a hollow fiber using the same
  • Hollow fiber, dope solution composition for forming a hollow fiber, and method for manufacturing a hollow fiber using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0431] As shown in Reaction Scheme 5, a hollow fiber including polybenzoxazole represented by Chemical Formula 51 was prepared from a doping solution composition for forming a hollow fiber containing polyhydroxyimide.

[0432] [Reaction Scheme 5]

[0433]

[0434] (1) Preparation of polyhydroxyimide

[0435] 36.6 g (0.1 mol) of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane was placed in a 1000 ml nitrogen purged reactor and N-methylpyrrolidone (NMP) solvent was added. The reactor was placed in an oil bath to constantly maintain the reaction temperature at -15°C. 44.4 g (0.1 mol) of 4,4'-(hexafluoroisopropene) diphthalic anhydride was slowly injected into the resulting solution. Then, the solution was allowed to react for about 4 hours to prepare a pale yellow viscous polyhydroxyamic acid solution.

[0436] 300 ml of toluene was added to the polyhydroxyamic acid solution. When the temperature of the reactor was raised to 150° C., polyhydroxyimide was obtained by perf...

Embodiment 2

[0444] A hollow fiber comprising polybenzoxazole was prepared in the same manner as in Example 1, except that 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane and 4,4'-(hexafluoropropane Fluoroisopropylene) diphthalic anhydride was reacted at 180°C in a toluene-free solution for 24 hours to prepare polyimide.

[0445] The hollow fiber had a weight-average molecular weight of 9,240 and was identified as having 1620 cm which polyimide did not have as a result of FT-IR analysis. -1 (C=N), 1058cm -1 (C-N) frequency band, characteristic frequency band of polybenzoxazole. In addition, the hollow fiber has a free volume fraction of 0.34 and a interplanar spacing (d-spacing) of 680 pm.

[0446] The interplanar spacing (d-spacing) was determined by X-ray diffraction (XRD, CuKα rays, 10 to 40 degrees at 0.05 degree intervals, film samples).

Embodiment 3

[0448] A hollow fiber including polybenzothiazole represented by the following Chemical Formula 52 was prepared through the following reaction.

[0449] [chemical formula 52]

[0450]

[0451] A hollow fiber including polybenzothiazole represented by the above Chemical Formula 52 was prepared according to the same method as in Example 1, except that by making 20.8 g (0.1 mol) of 2,5-diamino-1,4-benzenedithiol Dihydrochloride (2,5-diamino-1,4-benzenedithiol dihydrochloride) was used as a starting material to react with 44.4g (0.1mol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride to prepare SH) polyimide.

[0452] The hollow fiber had a weight average molecular weight of 32,290 and was identified as having a 1484 cm -1 (C-S), 1404cm -1 (C-S) Characteristic bands of polybenzothiazole. Furthermore, it has a free volume fraction of 0.28 and a interplanar spacing (d-spacing) of 640 pm.

[0453] The interplanar spacing (d-spacing) was determined by X-ray diffraction (...

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Abstract

Provided is a hollow fiber with a structure including a cavity at the center of the hollow fiber, macro-pores disposed in the periphery of the cavity, and meso-pores and pico-pores disposed in the periphery of the macro-pores, wherein the pico-pores are connected to each other in a three-dimensional manner to form a three-dimensional network. The hollow fiber contains a polymer derived from a polyimide, wherein the polyimide includes repeating units prepared from aromatic diamines and dianhydrides containing at least one functional group existing at an ortho-position relative to an amine group.

Description

technical field [0001] The present disclosure relates to hollow fibers, doping solution compositions for forming hollow fibers, and methods of making hollow fibers using the doping solution compositions. Background technique [0002] Membranes should meet the requirements of excellent thermal stability, chemical stability and mechanical stability, high permeability and high selectivity so that they can be commercialized and then applied in various industries. The term "permeability" as used herein is defined as the rate at which a substance permeates through a membrane. The term "selectivity" as used herein is defined as the permeation ratio between two different gas components. [0003] Based on separation performance, membranes can be classified into reverse osmosis membranes, ultrafiltration membranes, microfiltration membranes, gas separation membranes, and the like. Based on shape, membranes can be roughly classified into flat sheet membranes, rolled membranes, compos...

Claims

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Application Information

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IPC IPC(8): D01D5/24D01D5/247D01F6/80C08L79/08C08K5/42C08K5/34C08K5/05
CPCD01D5/24C08G75/32D01F1/08C08G73/22C08L79/08B01D71/64C08G73/1042B01D69/08C08G73/18B01D67/0011B01D2325/025D01D5/247D01F6/74B01D69/087C08G73/10B01D2325/026
Inventor 郑哲豪韩尚勳李永茂朴浩范
Owner IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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