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Recyclable multifunctional dynamic covalent polymer aerogel materials and their preparation methods and applications

A multifunctional, polymer technology that is used in aerogel preparation, carbon preparation/purification, chemical instruments and methods to achieve high sound absorption coefficient, low thermal conductivity, and strong load-bearing capacity

Active Publication Date: 2022-07-15
颜徐州
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the use of dynamic covalent polymer networks to construct aerogels.

Method used

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  • Recyclable multifunctional dynamic covalent polymer aerogel materials and their preparation methods and applications
  • Recyclable multifunctional dynamic covalent polymer aerogel materials and their preparation methods and applications
  • Recyclable multifunctional dynamic covalent polymer aerogel materials and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This example provides a preparation method for preparing a dynamic recyclable multifunctional polymer. Specifically include the following steps:

[0049] Step 1: Dissolve 26.11 mmol of 2,5-dimethoxy-terephthalaldehyde in 50 ml of dimethyl sulfoxide, after complete dissolution, add 7.84 mmol of diethylenetriamine, and stir at 25°C for 12 h to obtain Polyimide prepolymer.

[0050] Step 2: 12.18 mmol of tris(2-aminoethyl)amine was added to the above-mentioned polyimine prepolymer, fully stirred, poured into a mold, and then moved to a 25° C. environment for aging for 3 days.

[0051] Step 3: Use dimethyl sulfoxide / anhydrous ethanol / acetone solvent system to perform solvent exchange on the gel obtained in step 2. After the end, place the sample in a 25°C environment to dry naturally. After drying, move it into a 60°C oven for drying. 12h. The resulting aerogel has a density of 120 mg / cm 3 , the linear shrinkage rate is 12%.

[0052] The aerogel prepared in Example 1 wa...

Embodiment 2

[0055] This example provides a preparation method for preparing a dynamic recyclable multifunctional polymer. Specifically include the following steps:

[0056] Step 1: Dissolve 3.73 mmol of terephthalaldehyde in 7 ml of absolute ethanol, after complete dissolution, add 1.12 mmol of diethylenetriamine, and stir at 35° C. for 12 h to obtain a polyimine prepolymer.

[0057] Step 2: 1.74 mmol of tris(2-aminoethyl)amine was added to the above-mentioned polyimine prepolymer, fully stirred, poured into a mold, and then moved to a 25° C. environment for aging for 2 days.

[0058] Step 3: Use anhydrous ethanol / acetone solvent system to perform solvent exchange on the gel obtained in step 2. After the end, the sample is placed in a 25°C environment to dry naturally. After drying, it is transferred to a 60°C oven for 12 hours. The resulting aerogel has a density of 115 mg / cm 3 , the linear shrinkage rate is 15%. like image 3 As shown in the SEM image of the aerogel sample prepared ...

Embodiment 3

[0060] (1) the aerogel of embodiment 2 is carried out recyclable experiment, specifically comprises the following steps:

[0061] Step 1: Dissolve 3.73 mmol of terephthalaldehyde in 7 ml of absolute ethanol, after complete dissolution, add 1.12 mmol of diethylenetriamine, and stir at 35° C. for 12 h to obtain a polyimine prepolymer.

[0062] Step 2: 1.74 mmol of tris(2-aminoethyl)amine was added to the above-mentioned polyimine prepolymer, fully stirred, poured into a mold, and then moved to a 25° C. environment for aging for 2 days.

[0063] Step 3: Use anhydrous ethanol / n-hexane solvent system to perform solvent exchange on the gel obtained in step 2 to obtain a polyimide aerogel, and then place the sample in a 25°C environment to dry naturally, and move it to 60°C after drying. Oven dry for 12h.

[0064] Step 4: Add 2.24 mmol of diethylenetriamine and 3.48 mmol of tris(2-aminoethyl)amine to 20 ml of absolute ethanol to prepare a recovery solution, and then cut the dried po...

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Abstract

The present invention provides a method for preparing a recyclable multifunctional dynamic covalent polymer aerogel material, which comprises the following steps: S1, mixing at least one difunctional reactive monomer A and at least one difunctional The reaction monomer B is dissolved in the solvent, and the prepolymer is obtained by stirring reaction; S2, adding a compound C containing at least three functional groups to the prepolymer obtained in step S1 as a crosslinking agent to obtain a dynamic covalent polymer wet coagulation glue; S3, subjecting the obtained dynamic covalent polymer wet gel to aging treatment and solvent exchange treatment, and then drying to obtain a recyclable multifunctional dynamic covalent polymer aerogel material; the recyclable multifunctional dynamic covalent polymer aerogel material; The dynamic covalent bond in the covalent polymer aerogel material is at least one of imine bond, disulfide bond and boron-oxygen bond. The method of the invention constructs a dynamic polymer gel network through dynamic covalent bonds, and realizes the recyclability of aerogel materials.

Description

technical field [0001] The invention relates to the technical field of aerogel preparation, in particular to a method for large-scale preparation of dynamic covalent polymer aerogel materials using dynamic covalent compound chemistry, in particular to recyclable multifunctional dynamic covalent Polymer aerogel material and preparation method and application thereof. Background technique [0002] Aerogel materials exhibit versatility due to their low density, high porosity, and high specific surface area, and are widely used in electromagnetic shielding, sensing, energy storage, catalysis, water treatment, thermal insulation, noise reduction and other fields. Huge application prospects. However, there are three problems faced in the industrialization of aerogel materials, namely brittleness, shrinkage and low yield. On the one hand, aerogel materials with ideal mechanical properties can be obtained through process control; on the other hand, shrinkage during the preparation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08L61/22C08G12/06C08G12/08B01J13/00C01B32/05
CPCC08J9/286C08G12/06C08G12/08B01J13/0091C01B32/05C08J2205/026C08J2361/22
Inventor 颜徐州张新海
Owner 颜徐州
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