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Preparation method of a superhydrophobic strain sensor composite material

A strain sensor and composite material technology, which is applied in the field of superhydrophobic composite material preparation, can solve the problem of few superhydrophobic stretchable sensors, and achieve the effect of maintaining sensitivity, good mechanical strength and thermal stability, and excellent sensitivity

Active Publication Date: 2021-08-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite remarkable progress, superhydrophobic stretchable sensors with excellent mechanical strength and excellent chemical resistance are still rare

Method used

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  • Preparation method of a superhydrophobic strain sensor composite material
  • Preparation method of a superhydrophobic strain sensor composite material
  • Preparation method of a superhydrophobic strain sensor composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a superhydrophobic strain sensor composite material is carried out according to the following steps:

[0026] (1) Dissolve 0.3g of heptafluorobutyric acid in 3g of tetrahydrofuran and stir for 1h, then add 0.5g of tetraethoxysilane and stir for 3h, put the mixed solution in an evaporating dish and dry it naturally to obtain fluorinated solidified agent;

[0027] (2) Dissolve 0.2g of perfluorooctyltriethoxysilane in 10g of dimethylformamide, and stir the solution for 2h, then add 0.2g of carbon nanotubes, in order to ensure uniformity, the The solution was sonicated for 30 minutes, and magnetically stirred for 6 hours, then the carbon nanotube-based solution was poured into an evaporating dish, and after natural air drying, the hydrophobic carbon nanotube powder was synthesized and collected;

[0028] (3) Disperse 0.3 g of carbon nanofibers for polymer toughening in 5 g of tetrahydrofuran, then add 5 g of polydimethylsiloxane and stir for 2 h and...

Embodiment 2

[0033] A preparation method of a superhydrophobic strain sensor composite material is carried out according to the following steps:

[0034] (1) Dissolve 0.3g of heptafluorobutyric acid in 3.5g of tetrahydrofuran and stir for 1.2h, then add 0.5g of tetraethoxysilane and stir for 3h, put the mixed solution in an evaporating dish and dry it naturally to obtain fluorine curing agent;

[0035] (2) Dissolve 0.2g of perfluorooctyltriethoxysilane in 12g of dimethylformamide, and stir the solution for 1.8h, then add 0.2g of carbon nanotubes, in order to ensure uniformity, the The tube solution was sonicated for 30 minutes, and magnetically stirred for 6 hours, then the carbon nanotube-based solution was poured into an evaporating dish, and after natural air-drying, the hydrophobic carbon nanotube powder was synthesized and collected;

[0036] (3) Disperse 0.3 g of carbon nanofibers for polymer toughening in 6 g of tetrahydrofuran, then add 5 g of polydimethylsiloxane and stir for 2 h...

Embodiment 3

[0041] A preparation method of a superhydrophobic strain sensor composite material is carried out according to the following steps:

[0042] (1) Dissolve 0.25g of heptafluorobutyric acid in 3g of tetrahydrofuran and stir for 0.9h, then add 0.5g of tetraethoxysilane and stir for 3h, put the mixed solution in an evaporating dish and dry it naturally to obtain fluorinated Hardener;

[0043](2) Dissolve 0.25g of perfluorooctyltriethoxysilane in 12g of dimethylformamide, and stir the solution for 2.5h, then add 0.25g of carbon nanotubes, in order to ensure uniformity, the The tube solution was sonicated for 30 minutes, and magnetically stirred for 5 hours, then the carbon nanotube-based solution was poured into an evaporating dish, and after natural air drying, the hydrophobic carbon nanotube powder was synthesized and collected;

[0044] (3) Disperse 0.3g of carbon nanofibers for polymer toughening in 6g of tetrahydrofuran, then add 6g of polydimethylsiloxane and stir for 2.5h an...

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Abstract

The invention discloses a preparation method of a superhydrophobic strain sensor composite material. The present invention introduces fluorinated polydimethylsiloxane as a building block, and then prepares a superhydrophobic stretchable sensor based on a mixture of fluorinated polydimethylsiloxane, perfluoropolyether and carbon nanotubes. The as-prepared samples showed a stable response even after extensive cyclic stretching, scraping, hand rubbing, sandpaper abrasion, 200 °C heat treatment, acid / alkali / salt attack, and high-speed drop / water jetting. Remains superhydrophobic with excellent mechanical strength and resistance to liquid impact. In addition, as a wearable strain sensor, the sample can maintain excellent sensitivity, durability, and repeatability when detecting finger or wrist bending, neck bending, and eye blinking, providing a reliable basis for the development of strain sensors.

Description

technical field [0001] The invention belongs to the technical field of preparation of superhydrophobic composite materials, and in particular relates to a preparation method of a composite material of a superhydrophobic strain sensor based on fluorinated polydimethylsiloxane. Background technique [0002] At present, stretchable sensors have great potential applications in artificial skin, human motion detection, electronics and other fields. Usually, stretchable sensors can be prepared by incorporating conductive fillers (such as metal nanomaterials, graphene, carbon nanotubes) into elastic polymers. Owing to the excellent electrical and mechanical properties of conductive materials, carbon nanotubes in particular have been widely used in stretchable sensing applications. Simultaneously, the CNT-based strain sensor simultaneously shows high sensitivity (∼35%) and excellent stretchability (45%). However, strain sensors are easily degraded when exposed to harsh environments...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L71/00C08K9/06C08K3/04C08K7/06
CPCC08K2201/011C08L83/04C08L71/00C08K9/06C08K3/041C08K7/06
Inventor 王鹏范孝良魏伟东李自强段巍
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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