Nanofiber reinforced polyimide aerogel material and preparation method thereof

A polyimide and aerogel technology, applied in the field of aerogel materials and their preparation, can solve problems such as low strength, and achieve the effects of enhanced mechanical strength, easy operation and simple preparation process

Active Publication Date: 2019-10-25
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 nanofiber-reinforced polyimide airgel material and its preparation method, which overcomes the weakness of low strength of the existing polyimide nanofiber airgel. Imide nanofibers into its gel, freeze-drying and thermal imidization techniques to prepare nanofiber-reinforced polyimide airgel

Method used

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  • Nanofiber reinforced polyimide aerogel material and preparation method thereof
  • Nanofiber reinforced polyimide aerogel material and preparation method thereof
  • Nanofiber reinforced polyimide aerogel material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Using N,N-dimethylacetamide as a solvent, the solid content is prepared by condensation polymerization of 4,4'-diaminodiphenyl ether and terephthalic anhydride in an ice-water bath in an equimolar ratio 15% polyamic acid. The specific process is as follows: Dissolve 8.0096g of 4,4'-diaminodiphenyl ether in 95.57g of N,N-dimethylacetamide, add 8.8556g of pyromellitic dianhydride, and react in an ice-water bath for 5h. Then, 4.0476 g of triethylamine was added, and the reaction was continued for 5 h to prepare a water-soluble polyamic acid solution with a solid content of 15%. The prepared water-soluble polyamic acid is precipitated with deionized water, and then washed and freeze-dried to obtain a water-soluble polyamic acid prepolymer for use.

[0032] (2) Using N,N-dimethylacetamide as a solvent, the solid content is prepared by condensation polymerization of 4,4'-diaminodiphenyl ether and terephthalic anhydride in an ice-water bath in an equimolar ratio It is 15...

Embodiment 2

[0035] The difference between this example and Example 1 is that the mass of the short polyimide nanofibers in Example 1 is changed to 0.25g. That is, take 50mL of deionized water, 2.5g of polyamic acid prepolymer, and 2.5g of triethylamine, mix them evenly, and obtain a polyamic acid hydrogel after 24 hours of sol-gel process. Then add 0.25g of short polyimide nanofibers to the hydrogel, mix well and then freeze-dry and thermally imidize the sample to obtain a fiber-reinforced polyimide airgel, which is named PI-10 .

Embodiment 3

[0037]The difference between this example and Example 1 is that the mass of the short polyimide nanofibers in Example 1 is changed to 0.5 g. That is, take 50mL of deionized water, 2.5g of polyamic acid prepolymer, and 2.5g of triethylamine, mix them evenly, and obtain a polyamic acid hydrogel after 24 hours of sol-gel process. Then add 0.5g of polyimide nano-short fibers to the hydrogel, mix well, freeze-dry and heat imidize the sample to obtain fiber-reinforced polyimide airgel, and name it PI-20 .

[0038] The stress-strain curves of nanofiber-reinforced polyimide airgel are as follows: figure 2 As shown, as the content of polyimide nano-short fibers increases, the maximum stress of the sample increases, and the curve does not shake significantly when the strain is 80%, indicating that it can still maintain structural integrity. The slope of the linear region in the curve also increases with the increase of the short fiber content, and the Young's modulus of the airgel in...

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Abstract

The invention relates to a nanofiber reinforced polyimide aerogel material and a preparation method thereof.Raw materials comprise water-soluble polyamide acid, polyimide nano short fiber, triethylamine, and water. The prepared polyimide aerogel is low in shrinkage rate, improvement of Young modulus is realized under the condition that the density is substantially unchanged, the comprehensive performance is excellent, the preparation process is simple and easy to operate, environment-friendly effect is achieved, and the application range of the polyimide aerogelis widened.

Description

technical field [0001] The invention belongs to the field of airgel materials and preparation thereof, in particular to a nanofiber-reinforced polyimide airgel material and a preparation method thereof. Background technique [0002] Airgel refers to a gel material composed of microporous solids and the dispersed phase is gas. It has the characteristics of low density, high specific surface area, etc., and has broad application prospects in aerospace, petrochemical, automobile industry, building insulation and other fields. [0003] Due to the low density of the aerogel, it has a high porosity and a hierarchical porous structure, thus having an ultra-low density. Therefore, aerogels have great application prospects in many fields such as construction, automobiles, aerospace, household appliances, petrochemical plants, and outdoor sports. However, in practical applications, airgel should not only have low density, but also its strength should be further improved to expand it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L79/08
CPCC08J9/286C08J2205/026C08J2479/08C08J2201/0484C08J2379/08
Inventor 樊玮赵兴宇刘天西杨帆薛甜甜张翔
Owner DONGHUA UNIV
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