Heat insulation polyimide nanofiber aerogel and preparation method thereof
A nanofiber and polyimide technology is applied in the field of thermal insulation polyimide nanofiber aerogel and its preparation, which can solve the problems of aerogel structure damage, loss of thermal insulation ability and the like, and achieve stress relief. The effect of concentration, excellent thermal insulation ability, good thermal insulation ability
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Embodiment 1
[0032] 1. Using N,N-dimethylacetamide as a solvent, the solid content of 15% polyamic acid to obtain a polyamic acid mixed solution. 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. A polyamic acid solution is prepared. Add the prepared polyamic acid mixed solution into a syringe, and perform electrospinning to obtain a polyamic acid nanofiber membrane.
[0033] 2. Using N,N-dimethylacetamide as a solvent, the solid content of 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 5 hours. 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-so...
Embodiment 2
[0036]The difference between this example and Example 1 is that the mass ratio of the polyamic acid nanofiber membrane to the water-soluble polyamic acid is 2:1. That is, take 50mL of deionized water, 0.8g of nanofiber membrane, 0.4g of water-soluble polyamic acid, and 0.4g of triethylamine and mix them uniformly. After freeze-drying and thermal imidization, the polyimide nanofiber airgel was obtained, which was designated as PI2-1.
Embodiment 3
[0038] The difference between this example and Example 1 is that the mass ratio of the polyamic acid nanofiber membrane to the water-soluble polyamic acid is 2:1. That is, take 50mL of deionized water, 0.96g of nanofiber membrane, 0.24g of water-soluble polyamic acid, and 0.24g of triethylamine and mix them uniformly. After freeze-drying and thermal imidization, the polyimide nanofiber airgel was obtained, which was designated as PI4-1.
[0039] The electron microscope picture of the polyimide nanofiber airgel prepared by embodiment 1-3, as figure 1 shown;
[0040] The thermal insulation infrared thermal imaging of the polyimide nanofiber airgel prepared in Example 2 at high temperature, such as figure 2 As shown, it can be seen that the aerogel still has good heat insulation ability after being placed on a hot stage at 300°C for 20 minutes;
[0041] The thermal insulation infrared thermal imaging of the polyimide nanofiber airgel prepared in Example 2 at a low temperatur...
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