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High-temperature-resistant and low-temperature-resistant piezoresistive sensing polyimide composite aerogel and preparation method thereof

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

Active Publication Date: 2020-02-11
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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  • High-temperature-resistant and low-temperature-resistant piezoresistive sensing polyimide composite aerogel and preparation method thereof
  • High-temperature-resistant and low-temperature-resistant piezoresistive sensing polyimide composite aerogel and preparation method thereof
  • High-temperature-resistant and low-temperature-resistant piezoresistive sensing polyimide composite aerogel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

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

[0048] (2) prepare a polyamic acid salt aqueous solution with a mass fraction of 3%, mix 3.79...

Embodiment 2

[0052] (1) Under nitrogen protection, 55 mL of N,N dimethylacetamide (DMAc) was added to a 250 mL three-necked flask, and 14.4092 g of 4,4'-diaminodiphenyl ether-2,2 was added while stirring. '-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 to obtain a polyamic acid (PAA) solution with a sulfonic acid group, weighed 8.0952g of triethylamine, added dropwise to the PAA solution at a speed of 3mL / min, and then continuously stirred for 2 After one hour, a polyamic acid salt (PAAS) solution that is not easily hydrolyzed and exists stably is obtained, and the molar ratio of diamine, dianhydride and triethylamine in the whole reaction process is 1:1:2. After precipitation, filtration and drying, water-soluble polyamic acid salt is obtained.

[0053] (2) prepare a polyamic acid salt aqueous solution with a mass fraction of 3...

Embodiment 3

[0057] (1) Under nitrogen protection, add 55mL of N,N dimethylformamide (DMF) to a 250mL three-necked flask, add 7.932g of p-phenylenediamine sulfonic acid while stirring, and after it is completely dissolved, then Add 55 mL of N,N dimethylformamide (DMF) and 12.4136 g of biphenyltetracarboxylic dianhydride (BPDA), and stir at room temperature for 4 hours to obtain a polyamic acid (PAA) solution with a sulfonic acid group, 12.1428g of triethylamine was weighed, added dropwise to the PAA solution at a speed of 3mL / min, and then continuously stirred for 2 hours to obtain a polyamic acid salt (PAAS) solution that was not easily hydrolyzed and stably existed. The molar ratio of anhydride and triethylamine was 1:1:3. After precipitation, filtration and drying, water-soluble polyamic acid salt is obtained.

[0058] (2) prepare a polyamic acid salt aqueous solution with a mass fraction of 3%, mix 10.23 mg of EDOT and 3 mL of the polyamic acid salt aqueous solution, add hydrochloric ...

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Abstract

The invention relates to high-temperature-resistant and low-temperature-resistant piezoresistive sensing polyimide composite aerogel and a preparation method thereof. The preparation method comprises:carrying out oxidative polymerization on a water-soluble polyamic acid salt solution containing a sulfonic acid group, EDOT and PSS to obtain a polyamic acid salt / PEDOT composite solution, injectinginto a mold, and carrying out freeze drying and high-temperature heat treatment to obtain the high-temperature-resistant and low-temperature-resistant piezoresistive sensing polyimide composite aerogel. According to the invention, the preparation method is simple in process and convenient to operate; and the prepared aerogel has characteristics of regular pore structure, controllable density, goodresilience and sensitive resistance change in a compressed state, can keep stable sensitivity at high and low temperatures, can be applied to intelligent wearable equipment in different environments,and is used for detecting various human body 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 aerogel 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 aerogel is mostly air, the porosity is as high as 80%-99.8%, the pore size is generally 1-100nm, and it also has a large 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 aerogels have the properties of high specific surface area, high porosity, low density and low thermal conductivity by sol-gel method and supercritical drying technology, and this excellent performance makes aerogels ...

Claims

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Application Information

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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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