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Shape memory aerogel and preparation method thereof

An aerogel and memory technology, applied in the field of materials, can solve the problems of low possibility of repeatable industrial production, complex operation process, small adjustable range, etc., and achieve high shape recovery rate, high degree of controllability, and extended application. range effect

Active Publication Date: 2021-11-16
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are few patents on shape memory airgel that have been published so far. Chinese patent CN108212032A discloses a shape memory airgel material and its preparation method, but the process of this method requires ice bath conditions, and the operation process is relatively complicated. The possibility of repeatability and industrial production is less, and the patent uses supercritical drying of anhydrous ethanol, which has high drying pressure and high requirements for drying. In addition, the airgel material prepared by the patent has a glass transition temperature range of 40 ~120℃, adjustable range is small

Method used

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  • Shape memory aerogel and preparation method thereof
  • Shape memory aerogel and preparation method thereof
  • Shape memory aerogel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] see figure 1 , figure 1 The schematic diagram of the preparation process of the shape memory airgel provided by the embodiment of the present invention, firstly, the sol is prepared by using specific raw materials and methods, and then it is converted into a gel, and then subjected to aging, solvent replacement, supercritical drying and / or freeze drying After that, the nanoporous shape memory airgel can be obtained. The specific process is as follows:

[0053] Get 6.28g of HDI trimer and 5.889g of (3-mercaptopropyl) trimethoxysilane and mix, add 400ml of acetone solution to the mixed solution, and quickly add 2.00g of azobisisoheptanonitrile, load React in a Schlenk bottle, stir the solution for 30 minutes, add 6ml of p-ethoxyaniline, stir the solution for 4 hours, add 1.62ml of water and 1ml of 25% ammonia solution, stir for 10 minutes, pour the above uniform solution into the mold and seal it, and heat it at 60°C Aging is carried out in a dry environment, and the a...

Embodiment 2

[0059] Take 9.97g of triallyl isocyanurate and 23.56g of (3-mercaptopropyl) trimethoxysilane and mix, add 400ml of acetone solution to the mixture, and quickly add 1.28g of azobisiso Put the butyronitrile into a Schlenk bottle for reaction, stir the solution for 30min, add about 6ml of N,N dimethylbutylamine, stir the solution for 4h, add 6.48ml of water and 1ml of 0.5% sodium hydroxide solution, stir for 10min, and After the above homogeneous solution was poured into a mold and sealed, it was aged in a dry environment at 60° C. for 3 days. After aging, the formed gel was taken out, and the solvent was replaced with acetone solution for 3 days, and carbon dioxide supercritical drying was carried out at a drying pressure of 20MP and a drying time of 4 days to obtain a shape memory aerogel.

[0060] The airgel is heated on a hot plate at 200°C, and the temperature distribution is analyzed with an infrared thermal imager, and the results can be found in Figure 5 , Image 6 wit...

Embodiment 3

[0063] Take 9.97g of triallyl isocyanurate and 23.56g of (3-mercaptopropyl) trimethoxysilane and mix, add 300ml of acetone solution to the mixture, and quickly add 1.28g of azobisiso Put the butyronitrile into a Schlenk bottle for reaction, stir the solution for 40min, add about 5ml of N,N dimethylaniline, stir the solution for 4h, add 6.48ml of water and 2ml of 0.5% sodium hydroxide solution, stir for 10min, and mix the above After the uniform solution was poured into the mold and sealed, it was aged in a dry environment at 60°C for 3 days. After aging, the formed gel was taken out, and the solvent was replaced with acetone solution for 3 days, and carbon dioxide supercritical drying was carried out at a drying pressure of 20MP and a drying time of 4 days to obtain a shape memory aerogel.

[0064] see Figure 8 , Figure 8 The thermal gravimetric decomposition diagrams of the shape memory aerogels prepared in Examples 1 and 3 of the present invention, wherein Curve 1 is the...

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Abstract

The invention provides a preparation method of shape memory aerogel, which comprises the following steps: step a) in a non-alcohol organic solvent, under anaerobic and stirring conditions, carrying out a first reaction on a sulfydryl reagent and an olefin reagent under the action of a benzoyl polymerization catalyst; step b), carrying out a second reaction on the reaction mixture obtained in the step a) under the action of aromatic tertiary amine under oxygen-free and stirring conditions; c) carrying out a third reaction on the reaction mixture obtained in the step b) under the action of water and a phase transfer catalyst, and carrying out aging and solvent replacement on the obtained reaction mixture to obtain gel; and d) carrying out carbon dioxide supercritical drying on the gel obtained in the step c). The method provided by the invention is simple in process, high in controllable degree, high in accuracy and simple and convenient to operate, and the obtained shape memory aerogel has the characteristics of high porosity, low density, high shape recovery rate, glass-transition temperature range of-60 to 180 DEG C and the like.

Description

technical field [0001] The technical field of materials of the present invention is specifically a shape memory airgel and a preparation method thereof. Background technique [0002] Airgel is a new lightweight porous amorphous nanomaterial with the smallest density in the world, with a porosity of over 98%. Currently, the lightest silicon aerogel is only 0.16mg / cm 3 . Aerogels can be divided into four types: organic aerogels, inorganic aerogels, hybrid aerogels, and composite aerogels. They can be dried to remove internal solvents while maintaining their own shape, and achieve high porosity, Gels with low-density effects are generally called aerogels. Due to their high porosity, low density, high specific surface area, and low thermal conductivity, aerogels are widely used in heat insulation, adsorption, Energy saving, energy storage devices and aerospace and other fields. [0003] With the development and progress of science and technology, there is an increasing demand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28B01J13/00C08L81/04
CPCC08J9/28B01J13/0091C08J2205/026C08J2381/04Y02P20/54
Inventor 程旭东何盼潘月磊
Owner UNIV OF SCI & TECH OF CHINA
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