| abstract |
The invention relates to the technical field of porous material preparation, in particular to a high-strength porous polyimide material and a preparation method thereof. Dissolve in a small molecule tertiary amine aqueous solution, add an appropriate amount of cross-linking agent and stir evenly, freeze into a solid, freeze-dry to obtain a porous polyamic acid tertiary amine salt, and then program the temperature to obtain a porous polyimide material. The beneficial effect of the invention is that the freeze-drying technology is used to treat the porous polyamic acid tertiary amine salt, which can avoid environmental pollution. The polyimide material has better low density, high porosity, low thermal conductivity, high specific surface area, high strength, thermal stability and thermal insulation, and improves the strength of the porous polyimide material. |