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A kind of preparation method of highly flexible carbon nanotube fiber

A technology of carbon nanotube fibers and carbon nanotubes, which is applied in the fields of fiber chemical characteristics, rayon manufacturing, textiles and papermaking, etc. It can solve problems such as high switching voltage, affecting electrical properties, changing pure carbon nanotube fibers, etc., and achieves transmission Effect of reduced resistance, high stretchability, and low production cost

Active Publication Date: 2022-04-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the polymer enters the pure carbon nanotube fiber, it will change the original structure of the pure carbon nanotube fiber, affect its electrical properties, and is not conducive to the transfer of carriers.
[0004] At present, the use of polymer crosslinking to improve the flexibility of carbon nanotube fibers can improve the sensitivity of smart textiles to a certain extent, but because polymers have a certain hindering effect on the transfer of carriers inside pure carbon nanotube fibers, so its High switching voltage, limited application range

Method used

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  • A kind of preparation method of highly flexible carbon nanotube fiber

Examples

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Embodiment 1

[0029] Such as figure 1 Shown, the present invention comprises the following steps:

[0030] A. Preparation of spinning dope: Dissolve polyvinyl alcohol in N, N dimethylformamide to obtain a polyvinyl alcohol solution with a concentration of 12 mg / mL. Then the polyurethane is dissolved in the polyvinyl alcohol solution, and the mass ratio of the polyvinyl alcohol to the polyurethane in the obtained mixed solution is 2:3. Then sodium dodecylbenzenesulfonate was dissolved in the mixed solution, and the concentration of sodium dodecylbenzenesulfonate in the obtained solution was 10 mg / mL. Then, the single-walled carbon nanotubes were added to the previously prepared mixed solution and magnetically stirred for 12 h, and the mass ratio of carbon nanotubes to sodium dodecylbenzenesulfonate in the obtained solution was 1:5. Finally, the mixed solution containing carbon nanotubes was homogenized for 30 minutes under a pressure of 30 MPa to obtain a spinning dope.

[0031] B. Spinni...

Embodiment 2

[0035] The difference between this example and Example 1 is: in step A, the concentration of polyvinyl alcohol is 18 mg / mL, the concentration of sodium dodecylbenzene sulfonate is 15 mg / mL, the temperature of fiber soaking in hot deionized water is 95 °C, and the time is 18 hours; other steps and parameters are the same as those in Example 1, the measured fiber elongation is 225%, and the 2% strain sensitivity is 47.8.

Embodiment 3

[0037] The difference between this example and Example 1 is: in step A, the concentration of polyvinyl alcohol is 24 mg / mL, the concentration of sodium dodecylbenzene sulfonate is 20 mg / mL, the temperature of fiber soaking in hot deionized water is 100 ° C, and the time is 24 hours; the other steps and parameters are the same as those in the first embodiment, the measured elongation of the fiber is 240%, and the 2% strain sensitivity is 53.1.

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Abstract

The invention discloses a preparation method of highly flexible carbon nanotube fiber, which comprises the following steps: preparing spinning stock solution; spinning by rotating coagulation bath method; and preparing porous composite fiber. The invention utilizes the difference in solubility of high molecular polymers in solvents, removes part of the polymers inside the fibers by soaking, and forms porous composite fibers. The carrier transfer resistance of the obtained fibers is reduced, and the switching voltage is reduced. The composite fiber obtained in the present invention has a porous structure, and there are greater structural changes inside the fiber during stretching, and the degree of change of electrical resistance with strain is more severe, so the fiber has higher stretchability and higher sensitivity. The invention can obtain composite fibers with different properties by adjusting the ratio of the spinning dope, can adapt to the needs of different working conditions, has low production cost, and is suitable for mass production.

Description

technical field [0001] The invention relates to a technology for preparing carbon nanotube fibers, in particular to a method for preparing highly flexible carbon nanotube fibers. Background technique [0002] With the development of society, smart textiles are playing an increasingly important role in people's daily life, and are widely used in medical monitoring, human body protection, flexible electronic products and other fields. As the basis of fabric products, the properties of fibers play a decisive role in the sensitivity, linearity and stretchability of textile sensing products. Carbon nanotubes (CNTs) have excellent electrical conductivity and mechanical properties, and are an important material for the development of wearable smart textiles. However, the preparation of highly stretchable and highly strain-sensitive carbon nanotube fibers is still a huge challenge, so it is an urgent task to develop new preparation methods to improve the flexibility of conductive f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/10D01F8/16D01F1/10
CPCD01F8/10D01F8/16D01F1/10
Inventor 王一奇肖光周庚衡
Owner DALIAN UNIV OF TECH