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Nanofiber modified polyimide aerogel material and preparation method thereof

A technology of polyimide and nanofiber, which is applied in the field of airgel materials and its preparation, can solve the problems of poor hydrophobic performance and low strength, and achieve the effect of improving hydrophobic performance, mechanical performance and macroscopic stability

Active Publication Date: 2019-12-31
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the above problems, the present invention provides a nanofiber modified polyimide airgel material and its preparation method, which overcomes the weaknesses of the existing polyimide airgel in low strength and poor hydrophobic performance. The invention adds polyimide nano-short fibers and polyvinylidene fluoride nano-short fibers to its gel. On the one hand, adding nano-fibers can enhance the mechanical strength of the aerogel and improve its hydrophobicity; on the other hand, adding nano- The fibers can inhibit the shrinkage of the airgel, so that the modulus of the airgel can be greatly improved with a small change in density

Method used

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

Examples

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Embodiment 1

[0038] (1) Preparation of water-soluble polyamic acid: using N,N-dimethylacetamide as solvent, adding equimolar ratio of 4,4'-diaminodiphenyl ether and terephthalic anhydride in an ice-water bath The polyamic acid with a solid content of 15% was prepared by condensation polymerization. The specific process is as follows: Dissolve 8.0096g of 4,4'-diaminodiphenyl ether in 95.57g of N,N-dimethylacetamide, then add 8.8556g of pyromellitic dianhydride, and react in an ice-water bath for 5h. Then, add 4.0476g triethylamine in the mixture, continue to react for 5h, can prepare the water-soluble polyamic acid solution that solid content is 15%; The prepared water-soluble polyamic acid is precipitated with deionized water, and then After washing and freeze-drying, the water-soluble polyamic acid prepolymer is obtained for use;

[0039](2) Preparation of polyimide nano-short fibers: using N,N-dimethylacetamide as a solvent, passing equimolar ratios of 4,4'-diaminodiphenyl ether and ter...

Embodiment 2

[0042] The difference between this example and Example 1 is that after the polyamic acid hydrogel is obtained in step (3) of Example 1, 0.125 g of the polyimide hydrogel prepared in step (2) of Example 1 is added therein. Amine nano-short fibers, that is: take 50mL deionized water, 2.5g water-soluble polyamic acid, 2.5g triethylamine, mix well, obtain polyamic acid hydrogel after 24h sol-gel process, and then in the hydrogel Add 0.125g of polyimide nano-short fibers to the mixture, mix the sample evenly, freeze-dry the sample, and heat-treat it in the air at 240°C for 1.0h to obtain polyimide nanofiber-modified polyimide airgel, and Named PIAs-1.

Embodiment 3

[0044] The difference between this example and Example 1 is that after the polyamic acid hydrogel is obtained in step (3) in Example 1, 0.125 g of the polyimide prepared in step (2) of Example 1 is added therein Nano-short fibers and 0.125g of polyvinylidene fluoride nano-short fibers (length 0.2-0.3mm, diameter 300-400nm), namely: take 50mL deionized water, 2.5g water-soluble polyamic acid, 2.5g triethylamine , mixed evenly, and polyamic acid hydrogel was obtained after 24h sol-gel process. Then add 0.125g of polyimide nano-short fibers and 0.125g of polyvinylidene fluoride nano-short fibers to the hydrogel, mix the sample evenly, freeze-dry the sample, and heat-treat it at 240°C for 1.0h in a nitrogen atmosphere to obtain Nanofiber modified polyimide airgel material, and named as PIAs-2.

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Abstract

Belonging to the technical field of aerogel materials and preparation thereof, the invention discloses a nanofiber modified polyimide aerogel material and a preparation method thereof. According to the invention, by adding polyimide nano-short fiber and polyvinylidene fluoride nano-short fiber into aerogel, on the one hand, the added nano fiber can enhance the mechanical strength of the aerogel and improve the hydrophobic properties; and on the other hand, the added nano fiber can inhibit the shrinkage of the aerogel, thus greatly improving the modulus of the aerogel under the condition of very small density change. The nanofiber modified polyimide aerogel material provided by the invention has excellent comprehensive performance, the preparation process is simple and easy to operate, green and environment-friendly, and the application range of the polyimide aerogel is widened.

Description

technical field [0001] The invention relates to a nanofiber modified polyimide airgel material and a preparation method thereof, and belongs to the technical field of airgel materials and its preparation. Background technique [0002] Airgel refers to a gel material composed of microporous solids and the dispersed phase is gas. Airgel materials have the characteristics of low density and high specific surface area, and have broad application prospects in the fields of aerospace, petrochemical industry, automobile industry and building insulation. [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 the actual application process, in addition to the low density of the aerogel, it is also required to ...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08L27/16C08J9/28
CPCC08J9/0061C08J9/0085C08J9/286C08J2201/0484C08J2205/026C08J2379/08C08J2427/16C08J2479/08
Inventor 刘天西樊玮侯豪情赵兴宇杨帆薛甜甜
Owner JIANGNAN UNIV
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