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Preparation method of two-phase flexible PDMS composite material and wearable pressure sensor

A pressure sensor, composite material technology, applied in chemical instruments and methods, fluid pressure measurement by changing ohmic resistance, instruments, etc., can solve the problem of difficult to obtain high sensitivity and stability of the sensor performance, porous sponge shedding, sensor conductive material Difficult to penetrate and other problems, to achieve the effect of reducing entanglement and agglomeration, improving electrical conductivity, high sensitivity and stability

Pending Publication Date: 2022-05-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, flexible pressure sensors are generally prepared first by porous PDMS, and then adsorb conductive materials by evaporation, sputtering or dip coating. Easy to fall off from the surface, especially after frequent compression operations, it is difficult to obtain high sensitivity and stable performance of the sensor

Method used

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  • Preparation method of two-phase flexible PDMS composite material and wearable pressure sensor
  • Preparation method of two-phase flexible PDMS composite material and wearable pressure sensor
  • Preparation method of two-phase flexible PDMS composite material and wearable pressure sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The flexible matrix material selected in this embodiment is polydimethylsiloxane PDMS, PDMS is a typical silicone rubber material, has a silicon-oxygen bond (Si-O) with a helical structure, and all side groups are methyl groups, PDMS silicon oxide The bonds have large bond angles, so they are prone to rotation, resulting in good flexibility. PDMS is a thermosetting material, which is divided into a main body and a curing agent. The main body is a siloxane oligomer, and the curing agent is a siloxane crosslinking agent. The two components can be crosslinked under heating conditions. Since there are multiple reaction sites between the main body of PDMS and the curing agent, it can be cured and formed under the action of heat after being fully mixed.

[0039] In this example, PDMS is used instead of water, graphene rGO and sugar particles are fully mixed, and PDMS sponge and curing agent are added, and after fully stirring, the tablet is pressed using a tablet press, and t...

Embodiment 2

[0053] In this embodiment, the preparation method of the two-phase flexible PDMS composite material as in the first embodiment is adopted, and a flexible resistive pressure sensor is formed. The flexible resistive pressure sensor is formed by connecting two-phase flexible PDMS composite materials and wires. Specifically, the prepared rGO / PDMS conductive sponge is placed on the work table, and the upper and lower sides of the conductive sponge are covered with conductive tape. The surface and lead out the tested electrodes to obtain a flexible resistive pressure sensor.

[0054] Sensitivity refers to the sensitivity of the sensor to the stimulus when it is stimulated by external pressure, which is mainly judged by the slope of the △R / R0 curve. In this embodiment, the sensitivity of the sensor is tested, and the influence of different graphene rGO concentrations on the sensitivity of the flexible resistive pressure sensor is compared. The sensitivity test method of the sensor i...

Embodiment 3

[0064] From the first and second examples, it can be obtained that when the doping concentration of graphene is 4wt%, the sensitivity of the flexible resistive pressure sensor is the highest. In this embodiment, weights and an electrochemical workstation are used to test the response time of the flexible pressure sensor, the sensor and the electrochemical workstation are used to form a series circuit, and then the i-t test program is selected in the program of the electrochemical workstation, and the weight is placed on the flexible pressure sensor. On the pressure sensor, record the response time of the flexible pressure sensor to the weight.

[0065] In this embodiment, the rGO / PDMS conductive sponge with the highest sensitivity is selected for the responsiveness and recovery test, and the response time and recovery time when the pressure is 1kPa, 2.5kPa and 5kPa are tested, and the test results are as follows Figure 5 shown.

[0066] When the applied pressure is 1kPa, the...

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Abstract

The invention discloses a two-phase flexible PDMS composite material preparation method, which comprises: completely mixing graphene and sugar particles, adding a pure PDMS sponge and a curing agent, completely stirring, carrying out tabletting by using a tabletting device, placing the uniform mixture into a drying oven, carrying out heating curing, taking out, and placing into water to melt the sugar so as to prepare an rGO / PDMS conductive sponge, the two-phase flexible PDMS composite material is obtained. By using an in-situ sugar template method and a tabletting method, the problems that a conductive material is difficult to permeate into the porous sponge and is easy to fall off in the prior art are solved; according to the present invention, the graphene is introduced into the PDMS matrix through the sugar particles, such that the graphene is uniformly distributed in the porous PDMS sponge, the particles are tightly connected, the particles are not easily separated from the inner surface of the PDMS sponge, the good sensitivity and the good durability are provided, and the stable resistance response is ensured;

Description

technical field [0001] The invention relates to the technical field of flexible pressure sensors, in particular to a method for preparing a two-phase flexible PDMS composite material and a wearable pressure sensor. Background technique [0002] With the rapid development of science and technology, wearable flexible pressure sensors have become a new research hotspot. When subjected to external stimuli, the wearable flexible sensor converts these stimuli and outputs them as human-readable electrical signals. Flexible pressure sensors are generally one of the most commonly used wearable sensors. They are mainly composed of flexible substrates and conductive phase materials. They have the characteristics of high sensitivity, deformability and strong cycle stability. They can convert external mechanical signals into electrical signals. Signal. [0003] As a new composite material, graphene composite materials, the synergy between materials and the introduction of new propertie...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K3/04C08K9/04C01B32/19C01B32/194G01L1/22G01L9/04
CPCC08K3/042C08K9/04G01L1/22G01L9/04C01B32/19C01B32/194C08K2201/001C08L83/04
Inventor 林红任孟陈宇岳张德锁
Owner SUZHOU UNIV
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