Composite fiber as well as preparation method and application thereof

A composite fiber and fiber technology, applied in the field of material science, can solve problems such as solvent evaporation, poor dimensional stability, and easy short circuit

Active Publication Date: 2021-04-20
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]However, the liquid working system severely limits the practical application of the above-mentioned electrochemical artificial muscles. In order to meet the challenge of the liquid working system, some current work has reported gel type electrolyte system, the quasi-solid artificial muscle prepared by using this electrolyte system is usually composed of two fibers serving as positive and negative electrodes; Lee et al. > The CNT artificial muscle with aqueous solution-poly(vinyl alcohol) gel electrolyte produced a contraction of 0.52% when driven at 1V; while the use of organic gel electrolyte can make the artificial muscle work at a higher driving voltage, at 5V driving voltage The parallel and braided CNT fibers can obtain high shrinkage of 11.6% and 5%. Due to the low mechanical strength and poor dimensional stability of th

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  • Composite fiber as well as preparation method and application thereof
  • Composite fiber as well as preparation method and application thereof
  • Composite fiber as well as preparation method and application thereof

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preparation example Construction

[0047] The embodiment of the present invention also provides the preparation method of described composite fiber, and described preparation method comprises:

[0048] The nanofiber sheath covering the conductive fiber is formed in situ on the surface of the conductive fiber by electrospinning, and the nanofiber sheath includes a three-dimensional porous structure formed by interweaving polymer nanofibers; and, in the nanofiber The three-dimensional porous structure of the fiber sheath is filled with ionic liquids.

[0049] Further, the preparation method specifically includes: twisting a plurality of conductive fibers in sequence until a uniform helical structure is formed, or twisting a single conductive fiber until a uniform helical structure is formed, and then The surface of the conductive fiber is fabricated to form the nanofiber sheath.

[0050] Further, the preparation method specifically includes: immersing the nanofiber sheath in an ionic liquid, so that the ionic li...

Embodiment 1

[0064] see figure 1 , a method for preparing artificial muscle fibers with high stability provided by the embodiment of the present invention, comprising depositing a layer of polyvinylidene fluoride-cohexafluoropropylene nanofiber network film on the surface of carbon nanotube fibers by electrospinning technology. Form a composite fiber, twist the composite fiber to obtain a helical fiber, fold the helical fiber in half in the middle, release the half-fold point to form a self-twisted fiber, then cut the fiber at the half-fold point, soak the twisted stranded fiber In [EMIm] BF 4 ) for 2 hours to obtain artificial muscle fibers.

[0065] Specifically, a method for preparing artificial muscle fibers with high stability specifically includes the following steps:

[0066] 1.1) After adding 4g of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) particles to 20ml of N-N dimethylformamide solution and stirring for 12 hours, a uniform PVDF-HFP spinning solution was obtained;...

Embodiment 2

[0077] A method for preparing artificial muscle fibers with high stability, comprising the steps of:

[0078] The preparation method of the artificial muscle fiber in this embodiment is basically the same as that in Example 1, the difference is that the preparation method of the artificial muscle fiber in this embodiment specifically includes:

[0079] Add 4g of polyvinylidene fluoride (PVDF) particles to 20ml of N-N dimethylformamide solution and stir to obtain a uniform PVDF spinning solution. Electrospinning technology is used to form a layer of PVDF nanofibers on the surface of carbon nanotube fibers in situ. Fiber; after the electrospinning is completed, the obtained composite fiber is dried at 60° C. for 24 hours;

[0080] The dried composite fibers are twisted and self-twisted in sequence, and the composite fibers are cut at the folding point to form two twisted composite fibers, and then the two composite fibers are respectively used as two electrodes for wiring , and t...

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Abstract

The invention discloses composite fiber as well as a preparation method and application thereof. The composite fiber comprises conductive fiber and a nanofiber sheath layer coating the surface of the conductive fiber, wherein the nanofiber sheath layer comprises a three-dimensional porous structure formed by interweaving polymer nanofibers, and the three-dimensional porous structure is filled with ionic liquid. The ionic liquid adopted by artificial muscle fiber provided by the invention is room-temperature molten salt, is low in vapor pressure, not easy to volatilize and wide in electrochemical window, is less affected by solvent evaporation compared with an organic or inorganic electrolyte used at present, and can stably work in air; and an electrolyte layer is formed by adopting an ionic liquid-filled nanofiber network, so that the use stability of the electrochemical artificial muscle fiber in the air can be ensured, and the service life is greatly prolonged.

Description

technical field [0001] The invention relates to an artificial muscle fiber, in particular to a composite fiber and its preparation method and application, belonging to the technical field of material science. Background technique [0002] Similar to biological muscles, artificial muscles have the characteristics of large contractile stress, high power density and high energy density, and have the characteristics of weaving and integration. In recent years, they have received extensive attention in the field of mechanical exoskeletons and soft robots. In many artificial muscles Among them, electrochemical artificial muscles have attracted widespread interest due to their low operating voltage, no obvious thermal effect, and no limitation of Carnot efficiency. [0003] Foroughi et al. first reported the twisted multi-walled carbon nanotube artificial muscle, which can produce 1 when stimulated at a voltage of 5V (vs. % shrinkage, by continuing to increase the fiber twist to f...

Claims

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Application Information

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IPC IPC(8): D06M15/256D06M15/31D06M13/473D02G3/44B25J9/10D06M101/40
Inventor 邸江涛任明李清文
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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