Stretchable flexible conductive composite material as well as preparation method and application thereof

A flexible conductive and composite material technology, applied in the field of conductive composite materials, can solve the problems of non-isotropic conductivity, reduced conductive network pathways, and limited application range, etc., and achieves simple and easy preparation methods, difficult deposition, and no need for support structure effect

Inactive Publication Date: 2017-05-17
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive filler size leads to high percolation threshold of conductive composites, reduced conductive network pathways, and low conductivity
Another disadvantage of the sandwich

Method used

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  • Stretchable flexible conductive composite material as well as preparation method and application thereof
  • Stretchable flexible conductive composite material as well as preparation method and application thereof
  • Stretchable flexible conductive composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) With PS microspheres with a median particle size of about 5.5 μm as the core, the surface is plated with silver by an electroless plating process to obtain silver-plated conductive particles, such as figure 1 and figure 2 shown;

[0048] 2) Mix the silver-plated conductive particles obtained in step 1), PDMS prepolymer and n-hexane according to a mass ratio of 7:3:3.5, add a curing agent, stir and mix evenly at room temperature, and vacuumize for 30 minutes to remove air bubbles. Pour the mixture into a polytetrafluoroethylene mould, leave it at room temperature for 1 hour, and heat it in an oven at 80°C for 4 hours after n-hexane volatilizes to solidify the mixture. The stretchable and flexible conductive composite material is obtained. Its microstructure is as follows: image 3 and Figure 4 shown.

[0049] After testing and calculation, the conductivity of the prepared conductive composite material is 4.5×10 4 S / m, the maximum tensile strain reaches 100%. Cu...

Embodiment 2

[0053] 1) Using PDVB microspheres with a median particle size of about 1 μm as the core, silver-plated on its surface through an electroless plating process to obtain silver-plated conductive particles;

[0054] 2) Mix the silver-plated conductive particles obtained in step 1), TPU and toluene according to the mass ratio of 4:1:5, rotate and mix evenly at room temperature at high speed, and vacuumize for 10 minutes to remove air bubbles. The mixture was spin-coated on a silicon wafer at 1000 rpm for 30 s to obtain a thin film mixture. The silicon wafer sample was placed at room temperature for 24 hours, and the stretchable and flexible conductive composite film was prepared after the toluene in the mixture evaporated.

[0055] After testing and calculation, the conductivity of the prepared conductive composite material is 1.5×10 5 S / m, the maximum tensile strain reaches 150%.

Embodiment 3

[0059] 1) taking PAA microspheres with a median particle size of about 350nm as the core, and plating silver on its surface through an electroless plating process to obtain silver-plated conductive particles;

[0060] 2) Mix the silver-plated conductive particles obtained in step 1), SBS and methyl ethyl ketone at a mass ratio of 5:5:20, mechanically stir and mix evenly at room temperature, and vacuumize for 5 minutes to remove air bubbles. The mixture was poured into a glass watch glass, and left at room temperature for 48 hours until the methyl ethyl ketone in the mixture was volatilized to form a film naturally, that is, a stretchable and flexible conductive composite material was obtained.

[0061] After testing and calculation, the conductivity of the prepared conductive composite material is 8.5×10 3 S / m, the maximum tensile strain reaches 500%.

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Abstract

The invention provides a stretchable flexible conductive composite material which comprises metal plated conductive granules and an elastic polymer, wherein the metal plated conductive granules adopt polymer granules as kernels, and the surfaces of the kernels are plated with a metal. The metal plated conductive granules are not liable to deposit in an elastic polymer solution, the prepared stretchable flexible conductive composite material is uniform in structure, stable in property and free of support structure, in addition, the particle sizes of the metal plated conductive granules can be easily regulated and controlled, the metal plated conductive granules can be processed to be of appropriate sizes, the percolation threshold of a conductive composite material can be reduced, and a flexible conductive film of which the thickness is less than 100 [mu]m can be prepared. In addition, the conductivity of the stretchable flexible conductive composite material provided by the invention is 6.5*10<2>-2*10<5>S/m, and besides, the inherent stretch rate of 30-80% of the elastic polymer can be maintained.

Description

technical field [0001] The invention relates to the technical field of conductive composite materials, in particular to a stretchable and flexible conductive composite material, its preparation method and application. Background technique [0002] Stretchable flexible conductive material is a kind of electrical conductor material with mechanical stretching and recovery ability, which can adapt to a large degree of mechanical deformation such as stretching and bending, and can be used in emerging electronic fields such as flexible circuits and wearable electronics. The convenient preparation method of conductive composite materials is usually composed of polymer matrix materials and conductive fillers, and the content of conductive fillers must be higher than its percolation threshold to have stable conductive properties. In order to obtain a composite material with high conductivity, it is generally necessary to use pure metals with high conductivity such as gold and silver ...

Claims

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Application Information

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IPC IPC(8): C08L25/06C08L25/02C08L33/02C08L53/02C08L33/12C08L83/04C08L75/04C08K9/02C08K7/14C08K3/04
CPCC08L25/02C08L25/06C08L33/02C08L33/12C08L53/02C08L53/025C08L75/04C08L83/04C08L2203/20C08L2205/18C08K9/02C08K7/14C08K3/04
Inventor 胡友根孙蓉赵涛朱朋莉朱玉张愿
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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