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A kind of parallel flexible strain sensor and preparation method thereof

A strain sensor, parallel technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of low conductivity of conductive polymer lines, low strain rate of conductive polymer lines, unable to achieve a predetermined sensitivity, etc., to achieve improvement Uneven deformation, wide application range, fast and diverse effects

Active Publication Date: 2022-06-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing technology for preparing flexible strain sensors has the problem of wasting raw materials because of the uneven distribution and irregular arrangement of carbon nanomaterials, which cannot achieve the desired sensitivity.
Moreover, there will be problems that the conductivity of the conductive polymer line is too low and the detection current is too weak
In addition, there are problems of short service life and low strain rate of conductive polymer lines

Method used

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  • A kind of parallel flexible strain sensor and preparation method thereof
  • A kind of parallel flexible strain sensor and preparation method thereof
  • A kind of parallel flexible strain sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 and figure 2 , the parallel flexible strain sensor in the figure is a specific embodiment of the present invention, which specifically includes a structural layer 1, an encapsulation layer 2, a conductive polymer circuit 3, a conductive glue 4 and a wire 5, wherein the structural layer 1 is the sensor body structure , which produces strain under the action of the load, the conductive polymer circuit 3 is packaged and arranged on the structural layer 1, and is connected to the detection circuit through the wire 5. The strain generated by the structural layer 1 drives the conductive polymer circuit 3. The lengthening or shortening changes, resulting in The resistance strain changes the current of the detection circuit connected to the sensor, so as to achieve the purpose of strain detection.

[0037] like figure 1 As shown in the figure, the structural layer 1 of this embodiment is provided with convex auxetic structures distributed in an array on the surf...

Embodiment 2

[0042] like image 3 As shown, the preparation method of the parallel flexible strain sensor in this embodiment specifically includes the following steps:

[0043] S1: According to the mass ratio of curing agent B agent: polydimethylsiloxane agent A = 1:10, configure the first flexible base liquid, curing agent B agent is polydimethylsiloxane agent A, which is used together Commonly used curing agent. A layer of the first flexible base liquid 7 is evenly coated in the groove of the mold 6, and then placed in a 100°C incubator for curing for 40 minutes to form the structural layer 1. Auxetic structures are directly formed.

[0044] S2: Put carbon nanomaterials, isopropanol and polydimethylsiloxane A into a beaker and mix them. The role of isopropanol here is a diluent. In order to better disperse carbon nanomaterials, ultrasonically disperse the mixture for 30 minutes. , magnetic stirring for 2 hours in a water bath at 90 °C, then adding the curing agent B, and stirring to o...

Embodiment 3

[0051] The preparation method in Example 2 was repeated, but in step S2, the carbon nanomaterials in the prepared carbon nanomaterial mixture accounted for 3wt%; in step S3, the mold was placed in a 2000V / cm high-voltage direct current electric field and allowed to stand for 20min.

[0052] The sensitivity test of the flexible strain sensor prepared in this example shows that the sensitivity index of the strain sensor is GF=58.4 (10% Figure 5 The mid-dotted line is shown. Because under the induction of the electric field, the carbon nanomaterials in the conductive polymer circuit are arranged in an orderly manner along the direction of the electric field, so only a small amount of carbon nanomaterials can achieve an orderly conductive path, thereby greatly improving the sensitivity of the sensor. Compared with the non-discharge field strain sensor, it can be seen that the sensitivity is increased by a factor of 16.

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Abstract

The invention discloses a parallel flexible strain sensor and a preparation method thereof. The parallel flexible strain sensor comprises a structural layer and a plurality of conductive polymer circuits packaged on the structural layer. The structural layer is provided with a Protruding auxetic structures distributed in an array, the conductive polymer lines are arranged along the strain direction of the auxetic structure on the structural layer, all the conductive polymer lines are connected in parallel between two sets of conductive glue, and the sensor wires are led out through the conductive glue. In the preparation method of the parallel flexible strain sensor, the present invention induces the orientation of carbon nano conductive particles in the polymer by applying a DC high-voltage electric field during the curing process of the conductive polymer circuit to form more conductive paths, thereby greatly improving the performance of the strain sensor. sensitivity.

Description

technical field [0001] The invention relates to flexible strain sensor technology, in particular to a parallel flexible strain sensor and a preparation method thereof. Background technique [0002] In recent years, flexible strain sensors have received extensive attention and development due to their high accuracy, wide measurement range, long life, and good frequency response characteristics. A flexible strain sensor is a resistive sensor that relies on resistance strain as a conversion element. There are two main preparation methods, namely, the method of coupling the conductive sensing film with the flexible substrate and the method of composite preparation using the conductive polymer circuit. Among them, the composite preparation of conductive polymer circuits is not only easy to operate, but also can control the electromechanical properties of the sensor, so it is an ideal method to prepare flexible strain sensors. In this method, the conductive medium in the conducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16
CPCG01B7/20
Inventor 云忠姚金甫姜豪冯云昊魏娟萍
Owner CENT SOUTH UNIV
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