Flexible wearable strain sensor and preparation method thereof

A strain sensor and flexible technology, applied in the field of strain sensors, can solve the problems of lack of practical features of strain sensors, poor stretchability of strain sensors, poor flexibility of PMMA, etc., and achieve the effects of wide strain test range, excellent product performance and high sensitivity

Inactive Publication Date: 2016-10-26
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional strain sensors are generally made of rigid materials, which have poor stretchability and are not wearable
In 2008, Pham et al. (Pham G T, Park Y B, Liang Z, et al. Processing and modeling of conductive thermoplastic / carbon nanotube films for strain sensing. Composites Part B Engineering, 2008, 39(1): 209-216) prepared polydicarbonate Methyl methacrylate (PMMA) / multi-walled carbon nanotubes (MWCNT) composite material, which has a reversible strain response below 1% strain, the disadvantage is that PMMA is not very flexible, so the strain based on this composite Sensor stretch is also poor
In 2013, Zhang et al. (Zhang R, DengH, Valenca R, et al. Strain sensing behavior of elastomeric composite films containing carbon nanotubes under cyclic loading. Composites Science & Technology, 2013, 74 (4): 1-5) prepared thermoplastic polyurethane (TPU ) / multi-walled carbon nanotube composite material, this composite material has good strain responsiveness under 5% strain, but shoulder peak appears under larger strain, the material does not have the practical characteristics of strain sensor

Method used

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  • Flexible wearable strain sensor and preparation method thereof
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  • Flexible wearable strain sensor and preparation method thereof

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preparation example Construction

[0030] The invention provides a method for preparing a strain sensor. A specific implementation method is: spin-coat PDMS with a thickness of 10-400 μm on a substrate, place it in an oven at 50-150° C. for 1-60 minutes, and then The electrospun fiber membrane modified by conductive filler is placed on it, and then the wire is introduced through the wire fixing unit, and finally a layer of PDMS with a thickness of 10-400 μm is spin-coated on it, and placed in an oven at 50-150 ° C to make it Complete curing is enough; wherein, the method for modifying the conductive filler on the electrospun fiber membrane is: mixing the conductive filler with deionized water to prepare a conductive filler dispersion with a mass concentration of 0.01 to 5%, and then placing the electrospun fiber membrane on the Sonicate in the dispersion for 1-100 minutes, and then place it in the air to dry.

[0031] In the present invention, the electrospun thermoplastic polyurethane fiber film is used as the...

Embodiment 1

[0032] The preparation of embodiment 1 strain sensor

[0033] The method for preparation, concrete steps are as follows:

[0034]Place the TPU and graphene nanosheets in an oven at 80°C for 8 hours to remove the moisture;

[0035] (1) Electrospinning: Add 5.8g of dried TPU into a mixed solvent of 10ml of N,N-dimethylformamide and 10ml of tetrahydrofuran, stir mechanically at room temperature for 2.5h to fully dissolve it, and prepare Uniform TPU spinning solution;

[0036] The TPU spinning solution is electrospun to form TPU electrospun fibers: Electrospinning parameters: the distance between the spinneret and the collection device is 15cm, the spinning voltage is 21KV, the drum speed is 1200r / min, and the collection device is wrapped with The rotating drum of aluminum foil, when the electric field force generated by the high voltage is greater than the surface tension of the solution, the spinning solution will form a jet at the spinneret, and then go through jet instabilit...

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Abstract

The invention relates to the field of strain sensors and in particular to a flexible wearable strain sensor and a preparation method thereof. The invention provides a flexible wearable strain sensor and is characterized in that the flexible wearable strain sensor includes an upper insulating layer, a conductive layer and a lower insulating layer. The conductive layer is arranged between the upper insulating layer and the lower insulating layer. The upper insulating layer and the lower insulating layer are made from a flexible wearable high-molecule material. The conductive layer is a high-molecule fiber/conductive filler composite film having a conductive network structure. According to the invention, the strain sensor is advantaged by low cost of raw materials, excellent product properties, simple technology operations, wide range of strain testing (suitable to response under large strain), and high sensitivity.

Description

technical field [0001] The invention relates to the field of strain sensors, in particular to a flexible and wearable strain sensor and a preparation method thereof. Background technique [0002] Conductive polymer composites (CPCs) are prepared by compounding conductive fillers with a polymer matrix. CPCs often exhibit rich response behaviors under external stimuli such as stress, temperature, gas, liquid, etc. This unique property makes CPCs an ideal sensitive device. The strain sensor realizes the change of CPC resistance, conductivity and capacitance by changing the microstructure of the composite material brought about by the stress field stimulation. Strain sensors based on changes in the resistance of composite materials caused by stress field changes have been widely used in physical health detection, motion detection, and structural health monitoring. At present, with the development of science and technology and the improvement of people's living standards, peopl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 代坤李国杰李泽宇郑国强刘春太申长雨
Owner ZHENGZHOU UNIV
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