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A kind of high and low temperature resistant piezoresistive sensing polyimide composite airgel and its preparation method

A composite aerogel and polyimide technology, applied in force/torque/work measuring instruments, instruments, measuring devices, etc., can solve the problems of poor resilience of porous materials, complex processes, and low piezoresistive sensing signals. , to achieve the effect of low cost, simple process and convenient operation

Active Publication Date: 2021-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a high and low temperature resistant piezoresistive sensing polyimide composite airgel and its preparation method, which can overcome the poor resilience and low piezoresistive sensing signal of porous materials prepared in the prior art And defects such as complicated process, the present invention uses the polyamic acid salt solution containing sulfonic acid group as medium, prepares and adds monomer 3,4-ethylenedioxythiophene (EDOT) and appropriate amount of polystyrene sulfonate (PSS) Poly 3,4-ethylenedioxythiophene (PEDOT) was synthesized as a conductive substance, and a polyimide conductive composite aerogel suitable for high and low temperatures with piezoresistive sensing was prepared by freeze-drying

Method used

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  • A kind of high and low temperature resistant piezoresistive sensing polyimide composite airgel and its preparation method
  • A kind of high and low temperature resistant piezoresistive sensing polyimide composite airgel and its preparation method
  • A kind of high and low temperature resistant piezoresistive sensing polyimide composite airgel and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0047] (1) Under nitrogen protection, add 55mL of N,N dimethylacetamide (DMAc) into a 250mL three-necked flask, and add 14.4092g of 4,4'-diaminodiphenyl ether-2,2 '-Disulfonic acid (ODADS), after it is completely dissolved, add 55mL of N,N dimethylacetamide (DMAc) and 8.7248g of pyromellitic dianhydride (PMDA), and stir at room temperature for 4 hours , to obtain a polyamic acid (PAA) solution with a sulfonic acid group, weigh 8.0952g of triethylamine, dropwise add it to the PAA solution at a speed of 3mL / min, and then continuously stir for 2 hours to obtain a polyamic acid that is not easily hydrolyzed and exists stably. Polyamic acid salt (PAAS) solution, the molar ratio of diamine, dianhydride and triethylamine is 1:1:2 in the whole reaction process, after precipitation, filtration and drying, water-soluble polyamic acid salt is obtained.

[0048] (2) Prepare a polyamic acid salt aqueous solution with a mass fraction of 3%, mix 3.79mgEDOT, 0.95mgPSS and 3mL of polyamic acid...

Embodiment 2

[0052] (1) Under nitrogen protection, add 55mL of N,N dimethylacetamide (DMAc) into a 250mL three-necked flask, and add 14.4092g of 4,4'-diaminodiphenyl ether-2,2 '-disulfonic acid (ODADS), after it is completely dissolved, add 55mL of N,N dimethylacetamide (DMAc) and 11.7688g of 3,3'4,4'-biphenyltetracarboxylic dianhydride (BPDA), stirred at room temperature for 4 hours, obtained polyamic acid (PAA) solution with sulfonic acid group, took by weighing the triethylamine of 8.0952g, was added dropwise to PAA solution with 3mL / min speed, then continuously stirred for 2 Hours later, a polyamic acid salt (PAAS) solution that was not easily hydrolyzed and existed stably was obtained, and the molar ratio of diamine, dianhydride and triethylamine in the entire reaction process was 1:1:2. After precipitation, filtration and drying, water-soluble polyamic acid salt is obtained.

[0053] (2) Prepare an aqueous solution of polyamic acid salt with a mass fraction of 3%, mix 8mgEDOT, 2mgPS...

Embodiment 3

[0057] (1) Under the protection of nitrogen, add 55mL of N,N dimethylformamide (DMF) into a 250mL three-necked flask, and add 7.932g of p-phenylenediaminesulfonic acid while stirring. After it is completely dissolved, then Add 55mL of N,N dimethylformamide (DMF) and 12.4136g of biphenyltetracarboxylic dianhydride (BPDA), stir at room temperature for 4 hours to obtain a polyamic acid (PAA) solution with a sulfonic acid group, Take the triethylamine of 12.1428g, add dropwise to PAA solution with 3mL / min speed, after continuous stirring 2 hours then, obtain the polyamic acid salt (PAAS) solution that is difficult for hydrolysis, stable existence, whole reaction process diamine, two The molar ratio of anhydride and triethylamine is 1:1:3. After precipitation, filtration and drying, water-soluble polyamic acid salt is obtained.

[0058] (2) preparation mass fraction is the polyamic acid salt aqueous solution of 3%, gets the polyamic acid salt aqueous solution of 10.23mgEDOT, 3mL t...

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Abstract

The invention relates to a high and low temperature resistant piezoresistive sensing polyimide composite aerogel and a preparation method thereof, comprising water-soluble polyamic acid salt solution containing sulfonic acid groups, EDOT and PSS, and obtained after oxidative polymerization The amic acid salt / PEDOT composite solution is injected into the mold, and after freeze-drying and high-temperature heat treatment, a polyimide composite airgel that can withstand high and low temperatures and can be used for piezoresistive sensing is obtained. The invention has simple process and convenient operation, and the prepared airgel has a regular pore structure, its density is controllable, it has good resilience, the resistance changes sensitively in the compressed state, and it can still maintain stable at high and low temperatures. Sensitivity, which can be used on smart wearable devices in different environments to detect various human actions.

Description

technical field [0001] The invention belongs to the field of functional composite hydrogel and its preparation, in particular to a high and low temperature resistant piezoresistive sensing polyimide composite airgel and a preparation method thereof. Background technique [0002] As a special kind of low-density porous material, aerogel has attracted the attention of researchers from all over the world due to its excellent specific surface area and porosity. The dispersion medium inside the airgel is mostly air, the porosity is as high as 80%-99.8%, the pore size is generally 1-100nm, and it also has a huge specific surface area, which can reach 400-1000m 2 / g. Since the material itself is mostly gas, the density can be as low as 3-600kg / m 3 . The prepared airgel uses the sol-gel method and supercritical drying technology to endow the airgel with high specific surface area, high porosity, low density, and low thermal conductivity, and this excellent performance makes the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08L65/00C08L25/18C08J9/28C08G73/10G01L5/00
CPCC08J9/286C08G73/1064C08G73/1067C08G73/1071C08G73/1007G01L5/00C08J2379/08C08J2465/00C08J2425/18C08J2201/0504
Inventor 赵昕汪文龙张清华董杰王江楠
Owner DONGHUA UNIV
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