A kind of polyimide airgel with micro-nano hierarchical hole distribution and preparation method thereof
A polyimide and multi-level pore technology is applied in the field of polyimide aerogel with micro-nano multi-level pore distribution and its preparation, which can solve the problems of poor thermal insulation performance of aerogel and the like. The effect of clever design, increased energy consumption, and simple process
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Embodiment 1
[0034] A method for preparing polyimide airgel with micro-nano hierarchical pores distribution, the specific steps are:
[0035] (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 the water-soluble polyamic acid for use.
[0036] (2) Preparation of polystyrene nanosphere emulsion: add 100ml of water to 10ml of styrene (Styrene), 0...
Embodiment 2
[0041] Similar to Example 1, the difference is that the amount of polystyrene emulsion in step (3) is 1.88ml, and the polyimide airgel of the micro-nano hierarchical porous distribution of the gained is recorded as PI-15%, and all the other are the same as those in the implementation. Example 1 is the same.
Embodiment 3
[0043] Similar to Example 1, the difference is that the amount of polystyrene emulsion in step (3) is 3.75ml, and the polyimide airgel of the micro-nano hierarchical porous distribution of the gained is denoted as PI-30%, and all the other are the same as those in the implementation. Example 1 is the same.
[0044] figure 1 It shows that: (a) the size of the nanospheres can be seen to be about 50nm; (b) the micron-scale pore structure of the three-dimensional connection of the airgel can be seen; (c) the nanopores of about 50nm in the pore wall of the airgel can be seen.
[0045] Figure 4 It shows that after the petals are placed on the airgel with a thickness of 10 mm in this embodiment and baked on the alcohol lamp for 5 minutes, the petals still retain moisture, which shows that the airgel has excellent heat insulation ability.
[0046] Figure 5It shows that there is no destructive mutation after compression, which means that the airgel has toughness and excellent mec...
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