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A kind of polyimide aerogel with petal effect and its preparation method and application

A polyimide gel and polyimide technology, which is applied in the fields of nanoporous materials and thermal insulation, can solve the problems of low output, low temperature resistance performance, loss of mechanical strength, etc., and achieve low thermal conductivity. , Huge application prospect, strong effect

Active Publication Date: 2022-03-08
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyimide airgel is generally hydrophilic, that is, it can absorb a large amount of water, which will directly cause the pores of the airgel to be filled with liquid and lose various excellent properties, such as low thermal conductivity, high porosity, and low density. etc. For this reason, the hydrophobization of polyimide airgel has become a major key technology to be solved
The hydrophobization technology currently used includes the introduction of fluorinated groups or other hydrophobic inorganic nanoparticles. The former preparation method is expensive and the yield is low; the composite material formed by the latter suffers from loss of mechanical strength, radiation resistance, and low temperature resistance.

Method used

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  • A kind of polyimide aerogel with petal effect and its preparation method and application
  • A kind of polyimide aerogel with petal effect and its preparation method and application
  • A kind of polyimide aerogel with petal effect and its preparation method and application

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preparation example Construction

[0040] Another aspect of the embodiments of the present invention also provides a method for preparing the aforementioned polyimide airgel with a petal effect, which includes:

[0041] Polymerize the mixed system containing acid anhydride monomer, diamine and solvent to form polyamic acid;

[0042]A chemical dehydrating agent is added to the mixed system, and then the polyimide gel is formed by standing still, and then aged, solvent replaced and dried to obtain the polyimide airgel with petal effect.

[0043] In some implementation cases, the preparation method specifically includes:

[0044] Add a certain amount of acid anhydride monomer into the diamine solution, stir and polymerize for a certain period of time to form a very dilute polyamic acid solution, forming a mixed system;

[0045] A chemical dehydrating agent is added to the mixed system, and then the polyimide gel is formed by standing still, and after aging and solvent replacement, it is dried by supercritical flu...

Embodiment 1

[0069] (1) Synthesis of polyamic acid: Dissolve 10mg of 4,4'-diaminodiphenyl ether in 100ml of N-methylpyrrolidone, stir and dissolve, then add 4,4'-biphenyl with 90% moles of the aforementioned diamine After ether dianhydride was stirred at 10°C for 10 h until it was completely dissolved, a dilute solution of polyamic acid was obtained.

[0070] (2) Synthesis of polyimide gel: Add 20 g of acetic anhydride / triethylamine (molar ratio: 1:1) mixture to the above polyamic acid mixture, stir rapidly for 10 minutes, and ultrasonically degas for 30 minutes. minute. Finally, the obtained solution was left standing at 10° C., and a polyimide gel was formed after 5 hours.

[0071] (3) Preparation of polyimide airgel with petal effect: put the above polyimide gel at 80°C for aging for 24 hours, then soak it in 100g of N-methylpyrrolidone for 12 hours, and then replace it with 200g of acetone Twice, 12 hours each time, and finally dry the replaced polyimide gel with supercritical carbon...

Embodiment 2

[0073] (1) Synthesis of polyamic acid: Dissolve 2 mg of 9,9-bis(4-aminophenyl)fluorene in 100 ml of dimethyl sulfoxide, stir and dissolve, then add 4,4'- After diphenyl ether dianhydride was stirred at 20°C for 8 hours until it was completely dissolved, a dilute solution of polyamic acid was obtained.

[0074] (2) Synthesis of polyimide gel: Add 5 g of acetic anhydride / pyridine (1:1 molar ratio) mixture into the dilute polyamic acid solution, stir rapidly for 20 minutes, and ultrasonically degas for 20 minutes. Finally, the obtained solution was left standing at 30° C., and a polyimide gel was formed after 3 hours.

[0075] (3) Preparation of polyimide airgel with petal effect: put the above polyimide gel at 60°C for aging for 24 hours, then soak it in 150g of N-methylpyrrolidone for 12 hours, and then replace it with 100g of acetone Twice, each time for 12 hours, and finally the replaced polyimide gel was dried with supercritical ethanol, the drying temperature was 100°C, th...

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Abstract

The invention discloses a polyimide airgel with petal effect, a preparation method and application thereof. The polyimide airgel with petal effect includes: a porous network skeleton composed of polyimide, and a plurality of uneven defect structures distributed in the porous network skeleton, the polyimide The amine airgel has a rough surface topography, and the polyimide airgel has a contact angle with water >90°. The preparation method includes: polymerizing a mixed system containing acid anhydride monomers, diamines and solvents to form polyamic acid, adding a chemical dehydrating agent to the mixed system, and then standing to form a polyimide gel , and then through aging, solvent replacement and drying, the polyimide airgel with petal effect was obtained. The polyimide airgel with petal effect of the present invention has superhydrophobicity, strong action force on water droplets, water resistance, high and low temperature resistance, nonflammability, low thermal conductivity, and has great application prospects.

Description

technical field [0001] The invention relates to a polyimide airgel and a preparation method thereof, in particular to a biomimetic structure, superhydrophobic polyimide airgel with a petal effect and a preparation method and application thereof, belonging to nanoporous materials and thermal insulation technology. Background technique [0002] Airgel is a nanomaterial with a continuous and open pore structure. It is currently the lightest solid material with the best thermal insulation performance in the world. Airgel has a high specific surface area (400 ~ 1500m 2 / g), high porosity (80-99.8%), low density (0.003-0.6g / cm 3 ) and low thermal conductivity (0.013-0.038W / m·k), it has broad application prospects in the fields of heat insulation, acoustic impedance coupling, adsorption, filtration, catalyst carrier, drug carrier, etc. So far, industry researchers have prepared various types of aerogels by chemical crosslinking, including silica aerogels (CN105236929A; CN1052538...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08L79/08
CPCC08J9/28C08J2205/026C08J2379/08C08J2205/05
Inventor 张学同王锦李鑫
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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