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A kind of high-stretch piezoelectric microfiber with double-stage wave structure and its preparation method

A wave structure, microfiber technology, applied in fiber processing, yarn, filament/wire forming, etc., can solve the problem of piezoelectric microfibers without pre-stretching strain, large deformation capacity, increase the inhomogeneity of mechanical properties of sensors, and unfavorable Practical application and other issues, to achieve the effects of large-scale preparation, improvement of structural designability, tensile properties, and high deformation capacity

Active Publication Date: 2021-08-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the whipping mode of the electrospinning jet is limited by the relative moving speed of the jet and the collecting plate. Generally, the wavy fiber can only be realized in a specific speed range, which limits the improvement of the amplitude-wavelength ratio of the in-plane wavy fiber. Therefore, It is necessary to rely on a large pre-stretch strain to prepare high-stretch PVDF piezoelectric fibers, which is not conducive to practical applications and tends to increase the inhomogeneity of the mechanical properties of the sensor
[0006] The Chinese patent CN105928452A previously submitted by the inventor discloses a preparation method of a tensile strain electric sensor, and further discloses a PVDF piezoelectric microfiber with an out-of-plane pop-up wave structure, although it can withstand 200% However, the problem of obtaining piezoelectric microfibers with large deformation capacity with a small pre-tensioning strain is still not solved

Method used

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  • A kind of high-stretch piezoelectric microfiber with double-stage wave structure and its preparation method
  • A kind of high-stretch piezoelectric microfiber with double-stage wave structure and its preparation method
  • A kind of high-stretch piezoelectric microfiber with double-stage wave structure and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0036] A kind of PVDF high tensile piezoelectric microfiber with two-stage wave structure, its preparation method comprises the steps:

[0037] 1) Prepare PVDF electrospinning solution.

[0038] Weigh 1g of PVDF powder, put it into a 25mL sample bottle with a stirring magnet, then add 2.5g of DMF and 2.5g of acetone, and quickly cover the bottle to prevent the acetone from volatilizing. Place the sample bottle on a magnetic stirrer to stir, set the heating temperature to 35°C, and stir for 4-6h until a uniform and transparent PVDF electrospinning solution is obtained. The spinning solution was left to stand for half an hour to remove air bubbles and set aside.

[0039] 2) Preparation of in-plane wavy PVDF piezoelectric microfibers.

[0040] Use a 1mL syringe to draw the PVDF solution after standing, connect the positive pole of the high-voltage DC power supply to the needle of the syringe, connect the negative pole of the high-voltage power supply to the metal collection pla...

Embodiment 2

[0048] A kind of PVDF high tensile piezoelectric microfiber with two-stage wave structure, its preparation method comprises the steps:

[0049] 1) Prepare PVDF electrospinning solution.

[0050] Weigh 1g of PVDF powder, put it into a 25mL sample bottle with a stirring magnet, then add 2g of DMF and 2g of acetone, and quickly cover the bottle to prevent the acetone from volatilizing. Place the sample bottle on a magnetic stirrer to stir, set the heating temperature to 35°C, and stir for 4-6h until a uniform and transparent PVDF electrospinning solution is obtained. The spinning solution was left to stand for half an hour to remove air bubbles and set aside.

[0051] 2) Preparation of in-plane wavy PVDF piezoelectric microfibers with different amplitude-wavelength ratios.

[0052] Use a 1mL syringe to draw the PVDF solution after standing, connect the positive pole of the high-voltage DC power supply to the needle of the syringe, connect the negative pole of the high-voltage D...

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Abstract

The invention relates to a high-stretch piezoelectric microfiber with a two-stage wave structure and a preparation method thereof. Firstly, a piezoelectric polymer with an in-plane wave structure is prepared on a two-dimensional programmable displacement platform by an electrospinning method The microfibers are then transferred to a viscous, pre-stretched elastic matrix, and the pre-stretched stress is gradually released to restore the elastic matrix to its original length, resulting in a dual-stage wave polymer piezoelectric microfiber. The test results show that the two-stage wave piezoelectric microfiber has a deformation ability far exceeding the pre-tension strain and good and stable piezoelectric performance, and the amplitude-wavelength ratio of the microfiber can be adjusted flexibly arbitrarily. The field of sensors has important application prospects.

Description

technical field [0001] The invention relates to the technical field of fiber materials and flexible sensing materials, in particular to a high-stretch piezoelectric microfiber with a two-stage wave structure and a preparation method thereof. Background technique [0002] Piezoelectric strain sensors are self-powered electronic devices that can convert dynamic deformation into electrical signals to achieve sensing functions. Piezoelectric strain sensors with tensile deformation capabilities can be used as wearable piezoelectric devices for monitoring the human body / robot. Joint movement, human respiration, and external deformation stimulation have become research hotspots in the field of human-computer interaction in recent years. [0003] Piezoelectric material is a key component of piezoelectric devices, and its mechanical properties play a decisive role in the deformation ability of piezoelectric sensors. However, the intrinsic elongation at break of typical inorganic pie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728D01D5/00D02G3/32D02G3/04
CPCD01D5/0023D01D5/0092D02G3/045D02G3/32D10B2321/042
Inventor 陈志宏徐萌袁月官建国戴亚文徐泓梁梓恒
Owner WUHAN UNIV OF TECH
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