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Liquid metal-based stretchable flexible functional conductor and preparation method thereof

A technology of liquid metal and flexible carrier, which is applied in the direction of cable/conductor manufacturing, equipment for manufacturing conductive/semiconductive layers, conductive layers on insulating carriers, etc., which can solve the problems of decreased conductivity and increased resistance, and achieve conductive The effect of increasing the efficiency, improving the working life and working stability, and realizing large-scale industrial production

Inactive Publication Date: 2018-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the deformation-resistance effect mechanism of the existing stretchable flexible functional conductors, the sensing mechanism is that when the material is stretched by an external force, the conductive network inside the material is locally deformed or broken, resulting in a decrease in conductivity, which is expressed as rise in resistance

Method used

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  • Liquid metal-based stretchable flexible functional conductor and preparation method thereof
  • Liquid metal-based stretchable flexible functional conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of the stretchable flexible functional conductor based on liquid metal, the specific steps are as follows:

[0029] (1) Measure 10 mL of polydimethylsiloxane (model: Dowkaning 189) in a small beaker at room temperature, then use a syringe to measure 2 mL of liquid metal (gallium:indium=3:2, g / g) and add In the polydimethylsiloxane, a cross-shaped stirring paddle was used to stir at a speed of 500 rpm for 10 minutes to obtain a conductive composite material;

[0030] (2) Apply 0.2g of conductive composite material on the medical bandage with a brush, the coating area is a rectangle of 3cm*1cm, connect electrodes at both ends, and dry at 60°C for 2 hours to obtain a stretchable flexible function based on liquid metal conductor.

[0031] The resistance of the prepared stretchable flexible functional conductor based on liquid metal is about 15.0Ω; when the conductor is stretched, the relative resistance-deformation curve is as follows figure 1 As shown, as...

Embodiment 2

[0033] The preparation of the stretchable flexible functional conductor based on liquid metal, the specific steps are as follows:

[0034] (1) Measure 10 mL of polyvinyl alcohol solution with a mass fraction of 5% in a small beaker at room temperature, and then use a syringe to measure 5 mL of liquid metal (gallium: indium: tin=3:1:1, g / g / g) adding polyvinyl alcohol solution, using a cross-shaped stirring paddle to stir at a speed of 800rpm for 5min, to obtain a conductive composite material;

[0035] (2) Coat 0.5g of conductive composite material on the cotton fiber non-woven fabric with a brush, the coating area is a rectangle of 3cm*1cm, connect electrodes at both ends, and dry at 60°C for 2h to obtain a liquid metal-based pullable Stretch flexible functional conductor.

[0036] The resistance of the prepared stretchable flexible functional conductor based on liquid metal is about 10.0Ω; since the hydrophilic polyvinyl alcohol is well combined with the cotton fiber non-wo...

Embodiment 3

[0038] The preparation of the stretchable flexible functional conductor based on liquid metal, the specific steps are as follows:

[0039] (1) Dissolve 1 g of polyurethane (PU) in 9 mL of polydimethylformamide (DMF) at room temperature, stir well to obtain a polyurethane solution; then measure 2 mL of liquid metal (gallium: indium: tin=3 : 2: 1, g / g) into the polyurethane solution, using an ultrasonic cleaner with a power of 400kW, ultrasonically ultrasonicated the mixture for 3 hours at the maximum power to obtain a uniformly dispersed composite system.

[0040] (2) Apply 0.30 g of the composite system on the elastic cloth with a brush, the coating area is a rectangle of 3 cm*1 cm, connect electrodes at both ends, and dry at 60 ° C for 2 hours to obtain a flexible and stretchable sensing material.

[0041] The resistance of the prepared stretchable flexible functional conductor based on liquid metal is about 30.0Ω. Since the polyurethane elastomer molecular chain is relativel...

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Abstract

The invention discloses a liquid metal-based stretchable flexible functional conductor and a preparation method thereof. The method comprises the following steps: (1) a polymer solution and a liquid metal are blended uniformly to obtain a conductive composite material; (2) the conductive composite material is loaded on a flexible carrier to obtain the liquid metal-based stretchable flexible functional conductor. The liquid metal-based stretchable flexible functional conductor is non-toxic and safe, and has a tensile deformation-resistance reduction effect in the stretching process, the resistance decreases as strain increases, and the stretchable flexible functional conductor has important application prospects in the field of force conductive materials.

Description

technical field [0001] The invention relates to the field of conductive materials, in particular to a stretchable and flexible functional conductor based on liquid metal and a preparation method thereof. Background technique [0002] Stretchable force-sensitive conductive composite materials are materials based on the deformation-resistance effect, and its sensing mechanism is that the resistance increases when the conductor is stretched. Stretchable flexible functional conductors consist of a polymer matrix and conductive fillers. Polymer matrices include polydimethylsiloxane (PDMS), polyurethane (PU), polyvinyl alcohol (PVA), and others. Conductive fillers include graphene, carbon nanotubes, silver nanowires, conductive carbon black, and the like. The flexible and stretchable functional conductors with deformation-resistance effect prepared by conductive fillers and polymers through regulated processes have broad application prospects in medical diagnosis, intelligent ro...

Claims

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Application Information

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IPC IPC(8): H01B5/14H01B13/00C09D183/04C09D5/24C09D129/04C09D175/04G01L1/22
CPCH01B5/14C08K3/08C09D5/24C09D129/04C09D175/04C09D183/04G01L1/22H01B13/0026
Inventor 刘岚巫运辉郑荣敏刘书奇王萍萍刘海州邓智富
Owner SOUTH CHINA UNIV OF TECH
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