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Sunlight self-repairing transparent flexible strain sensing composite material, preparation method and applications thereof

A composite material and strain sensing technology, which is applied in the field of solar self-repairing transparent flexible strain sensing composite materials and its preparation, can solve the problem of being easily affected by various environmental factors, or subjected to repeated bending, extrusion or Stretch and flexible strain sensors have high cost and reduced electrical conductivity, etc., to achieve excellent light transmittance, sensitive response to tensile strain, and uniform size

Inactive Publication Date: 2019-01-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, flexible strain sensors are faced with the problems of high cost and short life. During use, they are easily affected by various environmental factors, or subjected to repeated bending, extrusion or stretching, etc., causing micro-damages and resulting in material damage. The electrical conductivity is greatly reduced, and the performance of the device is invalid. It is urgently required that the material has a self-repair function, and the micro-damage can be repaired in time to avoid major accidents and losses caused by component and equipment failures.

Method used

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  • Sunlight self-repairing transparent flexible strain sensing composite material, preparation method and applications thereof
  • Sunlight self-repairing transparent flexible strain sensing composite material, preparation method and applications thereof
  • Sunlight self-repairing transparent flexible strain sensing composite material, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0069] (1) Preparation of polyurethane solution

[0070] Polyurethane is prepared by reacting 15-28 parts of diisocyanate monomer, 10-50 parts of polyethylene glycol monomer, 5-15 parts of disulfide bond-containing monomer, and 0.5-2.5 parts of cross-linking agent. The specific preparation process is as follows: Disulfide bond-containing monomers, polyethylene glycol monomers and diisocyanate monomers undergo polymerization reactions to generate disulfide bond-containing polyurethane linear prepolymers; the disulfide bond-containing polyurethane linear prepolymers are combined with crosslinked Reaction of reagents to obtain the polyurethane. For the preparation of polyurethane, reference may be made to the examples in the patent CN105669932A.

[0071] In this example, 9.96g of isophorone diisocyanate, 3.20g of bis(2-hydroxyethyl) disulfide and 8.00g of polyethylene glycol 400 (PEG400, with a molecular weight of 400) were weighed and dissolved in 150mL of anhydrous In dichlor...

Embodiment 2

[0079] (1) Preparation of polyurethane solution

[0080] Weigh 9.96g isophorone diisocyanate, 3.20g bis(2-hydroxyethyl) disulfide and 8.00g polyethylene glycol 400 (PEG400, molecular weight is 400) and dissolve in 150mL anhydrous dichloromethane, in Under the protection of argon, react at 60° C. for 10 h, add 0.2 g of triethanolamine, and continue to react for 3 h to obtain a polyurethane solution.

[0081] (2) Preparation of silver nanowires

[0082] Weigh 1.0g of silver nitrate and 1.0g of polyvinylpyrrolidone (K-90), add them into 100mL of ethylene glycol, stir well to dissolve. Then pour it into a 250mL hydrothermal reaction kettle, add 0.005g concentrated hydrochloric acid, mix well, heat to 140°C, and react for 16h. Cool to room temperature after the reaction, separate with a 200-1000-mesh standard sieve, wash with industrial alcohol, and finally disperse in dichloromethane to obtain a dichloromethane dispersion of silver nanowires.

[0083] This embodiment provides a...

Embodiment 3

[0086] (1) Preparation of polyurethane solution

[0087] Weigh 9.96g isophorone diisocyanate, 3.20g bis(2-hydroxyethyl) disulfide and 8.00g polyethylene glycol 400 (PEG400, molecular weight is 400) and dissolve in 150mL anhydrous dichloromethane, in Under the protection of argon, react at 60° C. for 10 h, add 0.2 g of triethanolamine, and continue to react for 3 h to obtain a polyurethane solution.

[0088] (2) Preparation of silver nanowires

[0089] Weigh 1.0g of silver nitrate and 1.5g of polyvinylpyrrolidone (K-60), add them into 100mL of ethylene glycol, stir well to dissolve. Then pour it into a 250mL hydrothermal reaction kettle, add 0.002g of concentrated hydrochloric acid, mix well, heat to 140°C, and react for 15h. Cool to room temperature after the reaction, separate with a 200-1000-mesh standard sieve, wash with industrial alcohol, and finally disperse in ethanol to obtain an ethanol dispersion of silver nanowires.

[0090] This embodiment provides a non-sandwic...

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Abstract

The invention relates to a sunlight self-repairing transparent flexible strain sensing composite material, a preparation method and applications thereof, wherein the composite material comprises a polyurethane substrate and metal nano-wires coated on the polyurethane substrate, wherein the polyurethane comprises, by weight, 15-28 parts of a diisocyanate monomer, 10-50 parts of a polyethylene glycol monomer, 5-15 parts of a monomer containing a disulfide bond, and 0.5-2.5 parts of a cross-linking agent. According to the present invention, the sunlight self-repairing transparent flexible strainsensing composite material has excellent light transmittance, is sensitive to tensile strain, and exhibits linear response; when the sunlight self-repairing transparent flexible strain sensing composite material is subjected to scratch or fracture damage, the multiple repairs of mechanical property and the electrical conductivity can be achieved under illumination, wherein the repair time is short, and the repair efficiency is high.

Description

technical field [0001] The invention belongs to the field of self-repairing strain sensors, and in particular relates to a sunlight self-repairing transparent flexible strain sensing composite material and its preparation method and application. Background technique [0002] In recent years, the development of flexible strain sensing devices has been very rapid, and can be used to detect various human activities, including large-scale bending movements of hands, arms and legs, and small-scale breathing, swallowing, muscle vibration during vocalization, and blood pressure Wait. Flexible strain sensors can effectively convert external stimuli into visible electrical signals, and have broad application prospects in the fields of human activity detection, health assessment, flexible electronic skin, and industrial robots. [0003] With the development of transparent and visible wearable devices, the transparency of flexible sensors as the core components has become a developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/38C08J7/06C08J5/18G01B7/16
CPCC08G18/3863C08G18/4833C08G18/6666C08J5/18C08J7/06C08J2375/08G01B7/16
Inventor 章明秋宋艺曦许卫民容敏智
Owner SUN YAT SEN UNIV
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