Method for preparing low-voltage-driven electro-induced shape memory composite material

A low-voltage drive and composite material technology, applied in the field of preparation of advanced functional materials, can solve the problems of poor overall conductivity, slow recovery speed, and low degree of dispersion, and achieve simple and easy preparation methods, improved conductivity, and low cost Effect

Inactive Publication Date: 2018-02-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method enables the conductive filler to be more effectively dispersed in the polymer matrix material through a simple and effective process, and the prepared low-voltage driven electro-induced shape memory composite material overcomes the overall conductivity caused by the low degree of dispersion of the conductive filler inside the material or the instability of the network structure. The problem of high driving voltage and slow recovery speed caused by poor performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Immerse the melamine sponge (with a pore size of 10 μm-50 μm) into a 4 mg / mL silver nanowire / ethanol dispersion at room temperature, wherein the silver nanowire is prepared by polyol method, and the aspect ratio is about 300; After 5 minutes, the melamine sponge that adsorbed the silver nanowire dispersion liquid was taken out, and put into a 50° C. blast drying oven to dry for 2 hours, and the silver nanowire / melamine sponge three-dimensional conductive network was obtained;

[0029] (2) Then place the silver nanowire / melamine sponge three-dimensional conductive network in the E51 epoxy resin matrix, and vacuumize for 15 minutes so that the three-dimensional conductive network is completely filled with the epoxy resin matrix, and finally cure at 140°C for 4 hours, The electrotropic shape memory composite material is obtained.

[0030] The electrical conductivity of the prepared electrotropic shape memory composite material is 5 S / cm, the proportion of conductive fi...

Embodiment 2

[0032] (1) Immerse the melamine sponge (with a pore size of 50 μm-100 μm) into a 2 mg / mL silver nanowire / ethanol dispersion at room temperature, wherein the silver nanowire is prepared by a hydrothermal method, and the aspect ratio is about 500; After 5 minutes, take out the melamine sponge that has adsorbed the silver nanowire dispersion, and put it in a blast drying oven at 70°C until it dries for 1 hour;

[0033] (2) Repeat the operation of step (1) 4 times to prepare a three-dimensional conductive network of silver nanowires / melamine sponge;

[0034] (3) Put the silver nanowire / melamine sponge three-dimensional conductive network into the E51 type epoxy resin matrix, and vacuumize for 15 minutes so that the three-dimensional conductive network is completely filled with the epoxy resin matrix, and finally cure at 130°C for 4 hours, The electrotropic shape memory composite material is obtained.

[0035] The electrical conductivity of the prepared electrotropic shape memory ...

Embodiment 3

[0037] (1) Immerse the PU sponge (with a hole diameter of 300 μm-500 μm) into 2 mg / mL silver nanowire / ethanol dispersion at room temperature, wherein the nanowire is prepared by polyol method, and the aspect ratio is about 300; 5 minutes Finally, the PU sponge that adsorbed the silver nanowire dispersion liquid was taken out, and put into an 80°C blast drying oven until it was dried for 1 hour, and the silver nanowire / PU sponge three-dimensional conductive network was obtained;

[0038] (2) Put the silver nanowire / PU sponge three-dimensional conductive network into the E51 epoxy resin matrix, and evacuate for 15 minutes so that the three-dimensional conductive network is completely filled with the epoxy resin matrix, and finally cured at 150 ° C for 3 hours to obtain Electrotropic shape memory composites.

[0039] The electrical conductivity of the prepared electrotropic shape memory composite material is 10 S / cm, the proportion of conductive filler (silver nanowire content) i...

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Abstract

The invention discloses a method for preparing a low-voltage-driven electro-induced shape memory composite material. The method comprises the specific steps of: immersing a three-dimensional porous material in silver nanowire dispersion liquid, taking the three-dimensional porous material out, and performing drying and assembling to form a three-dimensional silver nanowire conductive network; mixing a shape memory polymer base material with the conductive network through vacuum casting, and conducting high-temperature curing to obtain the low-voltage-driven electro-induced shape memory composite material. According to the method for preparing the low-voltage-driven electro-induced shape memory composite material, the conductive network filler can be dispersed in the polymer base material more effectively through a simple and effective process, and by means of the prepared low-voltage-driven electro-induced shape memory composite material, the problems of high driven voltage and low reply speed, which are caused by the poor whole conductivity due to low degree of dispersion of the conductive filler inside a material or an unstable network structure, are overcome.

Description

technical field [0001] The invention relates to the technical field of preparation of advanced functional materials, in particular to a preparation method of a low-voltage drive electro-induced shape memory composite material. Background technique [0002] Shape memory polymers are smart materials that can return to their original shape under external stimuli. Electrotropic shape memory materials can recover under external voltage stimulation. Compared with other types of stimulus responses, they have the characteristics of easy control, remote driving, and fast response. They are widely used in the fields of intelligent bionic robots, artificial muscles, and sensors. with broadly application foreground. [0003] Since most shape memory polymers are insulating materials, electrotropic shape memory composites are generally prepared by adding conductive fillers to the thermotropic shape memory polymer matrix or by plating a conductive film on its surface. Although the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/42C08J9/40C08L61/28C08L63/00C08L75/04C08K7/06
CPCC08J9/40C08J9/42C08J2361/28C08J2375/04C08J2463/00C08J2475/04C08K7/06C08K2201/001C08K2201/011C08K2201/016
Inventor 刘岚王萍萍陈松巫运辉刘书奇刘海州董旭初彭健
Owner SOUTH CHINA UNIV OF TECH
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