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Ultrahigh-elasticity wire and preparation method thereof

An elastic and wire technology, applied in the field of ultra-high elastic wire and its preparation, can solve the problems of increasing polymer hardness, affecting the elasticity of the polymer matrix, and being unsuitable for wearable electronics, etc., achieving small changes in conductance, novel preparation methods, excellent Effects of Cyclic Stability

Active Publication Date: 2018-09-11
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common methods for preparing elastic wires include three categories. The first is to fill the elastic polymer matrix with nano-conductive fillers. The disadvantage of this method is that the prepared wires have low conductivity, and a large amount of filling will lead to polymer hardness. Greatly increased, affecting the elasticity of the polymer matrix [Non-Patent Documents 3, 4]; the second is to fill the liquid metal in the hollow elastic polymer fiber, the disadvantage of this method is that the preparation is difficult and the toxicity is large. Not suitable for wearable electronics [Non-Patent Document 5]; the third is to attach flexible conductive materials to the surface of elastic fibers with prefabricated waves or helical structures. The problem with this method is that the interface between the conductive material and the elastic substrate is not strong enough , poor cycle stability [Non-Patent Document 6, Patent Document 1]
Due to the limitations of the structure and preparation method, the maximum stretching range of the reported elastic wire is about 10 times the initial length, which cannot meet the needs of ultra-stretchable electronic devices [Non-patent Document 7]

Method used

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preparation example Construction

[0049] Preparation of flexible conductive fibers. In one embodiment of the present invention, the flexible conductive fiber includes yarns in a helical structure (helical yarns or initial helical yarns), and conductive materials adsorbed on the yarns. The preparation method includes: selecting yarns with good hygroscopicity and processing them into a helical structure, controlling the initial helical diameter between 5-1000 μm, so as to obtain helical yarns. Then dip the helical yarn in the conductive slurry, keep it for a certain period of time, take it out, dry it, and repeat it several times to obtain the conductive helical yarn (flexible conductive fiber) with a primary helical structure. Wherein, the conductive paste is a paste containing conductive materials (for example, conductive polymer ink or ink, etc.), and its concentration may be 0.01-50 mg / ml. The solvent of the conductive paste includes at least one of alcohol (eg, ethanol, etc.), water, toluene, etc., but doe...

Embodiment 1

[0055] A bundle of helical polyester yarns (initial helical diameter 100-1000 μm, cross-sectional diameter 5-500 μm) was treated with oxygen plasma (100 W, 10 min), and then silver nanowires (length 20- 30 μm, diameter 80-100nm) ethanol dispersion (add a small amount of PVP, wherein the mass ratio of PVP and silver nanowires is 3:1-1:3) and dip coating twice, and then use hydrogen plasma treatment (100W, 10min), Then it is adhered to the pre-stretched 30% strained ecoflex substrate, and the conductive yarn is completely embedded by dripping ecoflex, and then cured at 75 degrees for 30 minutes, and the substrate is released to obtain an ultra-high elastic wire. The initial helical diameter of the ultra-high elastic wire is about 5mm, the initial cross-sectional diameter is 100-1000μm, the stretchable range can reach 100 times the initial length, and the conductivity is 10 4 S / cm.

Embodiment 2

[0057] A bundle of helical polyester yarns (initial helix diameter 100-1000 μm, cross-sectional diameter 5-500 μm) was treated with oxygen plasma (100W, 10min), and then silver nanowires (length 20- 30 μm, diameter 80-100nm) ethanol dispersion (adding a small amount of PVP, wherein the mass ratio of PVP and silver nanowires is 3:1-1:3) dipped and coated 3 times, and then treated with hydrogen plasma (100W, 10min), Then it is adhered to the pre-stretched 30% strained ecoflex substrate, and the conductive yarn is completely embedded by dripping ecoflex, and then cured at 75 degrees for 30 minutes, and the substrate is released to obtain an ultra-high elastic wire. The initial helical diameter of the ultra-high elastic wire is about 5mm, the initial cross-sectional diameter is 100-1000μm, the stretchable range can reach 100 times the initial length, and the electrical conductivity is 6*10 4 S / cm.

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Abstract

The invention provides an ultrahigh-elasticity wire and a preparation method thereof. The ultrahigh-elasticity wire is in a helical structure, and the ultrahigh-elasticity wire comprises a bottom elastic substrate, flexible conductive fibers adhered to the surface of the bottom elastic substrate and in a helical structure, and a flexible filling substrate embedded in the flexible conductive fibers.

Description

technical field [0001] The invention relates to an ultra-high elastic wire and a preparation method thereof, belonging to the field of flexible, stretchable and wearable electronics and the technical field of new materials. Background technique [0002] The development trend of traditional electronics is miniaturization and integration, while the latest development trend and development requirements of current electronics are flexibility, scalability and wearability [Non-patent literature 1,2]. Elastic wire refers to a new type of flexible wire that can maintain excellent conductivity after large deformation. It is an important part of flexible and wearable electronic devices and plays an important role in information perception and transmission. Common methods for preparing elastic wires include three categories. The first is to fill the elastic polymer matrix with nano-conductive fillers. The disadvantage of this method is that the prepared wires have low conductivity, and...

Claims

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Application Information

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IPC IPC(8): H01B7/06H01B7/18H01B13/00H01B13/22
CPCH01B7/065H01B7/1805H01B13/00H01B13/22
Inventor 王冉冉孙静程荫
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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