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Graphene fiber and preparation method thereof

A graphene fiber and graphene technology, applied in the chemical characteristics of fibers, textiles and papermaking, chemical post-treatment of rayon, etc., can solve the problems of holes, low mechanical properties of fibers, and insufficient density of fibers

Active Publication Date: 2020-12-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a common problem in the graphene fibers prepared at present: the mechanical properties of the fibers are far lower than their theoretical mechanical properties. One of the main reasons is that the fibers are not dense enough and there are holes, resulting in low mechanical properties of the fibers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare graphene fiber method, specifically comprise the steps:

[0034] 1. Dissolve 100mg of graphene oxide in 10mL of deionized water, and ultrasonically disperse to obtain a uniformly dispersed graphene oxide liquid crystal dispersion. The solution is centrifuged at a speed of 6000r / min, and centrifuged for 10min to remove insoluble impurities;

[0035] 2. Measure 30mL of ethanol, blend with 7.5mL of deionized water, and stir for 5min;

[0036] 3. Weigh 46.755g of zinc chloride, dissolve it in the solution prepared in step 2, place it in a shaking water bath at 60°C, shake for 25min, and the mass fraction of zinc chloride is 60%;

[0037] 4. Weigh 0.787g of polyacrylonitrile powder, dissolve it in the solution prepared in step 3, stir at room temperature for 4 hours to completely swell the polyacrylonitrile, then place it in a shaking water bath at 60°C, shake for 5 hours, and polyacrylonitrile The mass fraction of acrylonitrile is 1%;

[0038] 5. Put the graphene ...

Embodiment 2

[0041] The method for preparing graphene fiber specifically comprises the steps:

[0042] 1. Dissolve 150mg of graphene oxide in 10mL (N,N-dimethylformamide), and disperse by ultrasonic to obtain a uniformly dispersed graphene oxide liquid crystal dispersion. Centrifuge the solution at 8000r / min for 15min to remove insoluble impurities;

[0043] 2. Measure 30mL of ethanol, blend with 10mL of deionized water, and stir for 5min;

[0044] 3. Weigh 50.505g of zinc chloride, dissolve it in the solution prepared in step 2, place it in a shaking water bath at 60°C, shake for 25min, and the mass fraction of zinc chloride is 60%;

[0045] 4. Weigh 2.603g of polyacrylonitrile powder, dissolve it in the solution prepared in step 3, stir at room temperature for 4 hours to completely swell the polyacrylonitrile, then place it in a shaking water bath at 60°C, shake for 6 hours, and polyacrylonitrile The mass fraction of acrylonitrile is 3%;

[0046] 5. Put the graphene oxide liquid cryst...

Embodiment 3

[0049] The method for preparing graphene fiber specifically comprises the steps:

[0050] 1. Dissolve 200mg of graphene oxide in 10mL of dimethyl sulfoxide, and ultrasonically disperse to obtain a uniformly dispersed graphene oxide liquid crystal dispersion. The solution is centrifuged at 8000r / min for 20min to remove insoluble impurities ;

[0051] 2. Measure 30mL of ethanol, blend with 10mL of deionized water, and stir for 5min;

[0052] 3. Weigh 50.505g of zinc chloride, dissolve it in the solution prepared in step 2, place it in a shaking water bath at 60°C, shake for 25min, and the mass fraction of zinc chloride is 60%;

[0053] 4. Weigh 4.430g of polyacrylonitrile powder, dissolve it in the solution prepared in step 3, stir at room temperature for 5h to completely swell the polyacrylonitrile, then place it in a shaking water bath at 60°C, shake for 6h, polyacrylonitrile The mass fraction of acrylonitrile is 5%;

[0054] 5. Put the graphene oxide liquid crystal dispers...

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Abstract

The invention discloses graphene fiber and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing graphene oxide with a polar solvent to obtain a graphene oxide liquid crystal dispersion liquid; (2) mixing and swelling polyacrylonitrile powder with ethanol, water and inorganic matters to obtain a polyacrylonitrile solution; (3) solidifying and forming the graphene oxide liquid crystal dispersion liquid in the polyacrylonitrile solution, washing and drying to obtain graphene oxide fiber; (4) carrying out heat stabilization and carbonization treatmenton the graphene oxide fiber to obtain the graphene fiber. The graphene fiber prepared by the method has relatively good compactness and relatively high mechanical property. Specifically, compared withcommon graphene fiber, the monofilament strength of the obtained graphene fiber can be improved by at least 9%, and the modulus can be improved by at least 12%.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a graphene fiber and a preparation method thereof. Background technique [0002] Graphene has attracted much attention as a new type of carbon material since it was prepared for the first time in 2004. It is a completely sp 2 The thickness of hybrid carbon atoms is only a single atomic layer or a two-dimensional crystal material stacked by several single atomic layers, which has extremely high light transmission (97%), high conductivity (10 8 S m -1 ), high thermal conductivity (5300W m -1 ·K -1 ) and the highest tensile strength (125GPa), Young's modulus (1100TPa). These excellent properties of graphene make it widely used in many fields, but most of them are used as reinforcing materials, while the assembly materials of graphene are relatively few, mainly concentrated in hydrogels, aerogels and films. Until 2011, graphite The emergence of graphene fiber...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/12D01F11/10
CPCD01F9/12D01F11/10
Inventor 徐樑华徐德华高爱君李常清曹维宇王宇童元建赵振文
Owner BEIJING UNIV OF CHEM TECH
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