A nitrogen-rich porous polyimide nanofiber membrane and its preparation method
A technology of nanofiber membrane and polyimide, applied in the field of nitrogen-rich porous polyimide nanofiber membrane and its preparation, to achieve strong adsorption capacity and increase specific surface area
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Embodiment 1
[0043] A preparation method of nitrogen-rich porous polyimide nanofiber membrane, comprising the following steps:
[0044] Step 1: Configure Electrospinning Dope
[0045] PDA (1,4-diaminobenzene) was added to the reaction vessel, and DMAc (N,N-dimethylacetamide) solution was added to dissolve it into a colorless and transparent PDA solution. Then use DMAc as a solvent to dissolve BPDA (3,3',4,4'-biphenyltetracarboxylic dianhydride), gradually add the dissolved BPDA solution into the PDA solution in two batches, and mix them evenly for 5 minutes each time. Then proceed to the next step. Finally, after mixing the BPDA solution and the PDA solution at a ratio of 1:1 (v / v), the obtained reaction solution was heated under vacuum, heated at 60 °C and stirred for 36 h to obtain a spinning stock solution of polyamic acid, and placed Store at -20°C. Prepare 10wt% polyamic acid solution, the higher the concentration, the longer the storage time will be, and it will be diluted step by...
Embodiment 2
[0062] A preparation method of nitrogen-rich porous polyimide nanofiber membrane, comprising the following steps:
[0063] Step 1: Configure Electrospinning Dope
[0064] Mix and dissolve 1,4-diaminobenzene (PDA) and N,N-dimethylacetamide solution (DMAc) to obtain a colorless and transparent PDA solution;
[0065] 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) was added to N,N-dimethylacetamide solution (DMAc) to obtain BPDA solution;
[0066] The BPDA solution was added to the PDA solution in three batches, and after each batch was added, stirring was uniform, and each batch was stirred for 2 min to obtain a reaction solution; by volume ratio, BPDA solution: PDA solution=1:1; molar ratio, BPDA: pda=1:1;
[0067] The reaction solution was heated to 65°C under vacuum, and stirred at this temperature for 30h to obtain a spinning stock solution polyamic acid;
[0068] Mix the spinning stock solution polyamic acid with a mass concentration of 5% and a zein solution with a...
Embodiment 3
[0076] A preparation method of nitrogen-rich porous polyimide nanofiber membrane, comprising the following steps:
[0077] Step 1: Configure Electrospinning Dope
[0078] PDA (1,4-diaminobenzene) was added to the reaction vessel, and a tetrahydrofuran (THF)-methanol mixed solvent with a mass ratio of 4:1 was added to dissolve it into a colorless and transparent PDA solution. Then use tetrahydrofuran (THF)-methanol mixed solvent with a mass ratio of 4:1 as a solvent to dissolve BPDA (3,3',4,4'-biphenyltetracarboxylic dianhydride), and gradually divide the dissolved BPDA solution into two batches. Add it to the PDA solution, and be sure to mix it for 2 minutes each time before proceeding to the next step. Finally, after mixing the BPDA solution and the PDA solution uniformly at 1:10 (v / v), the obtained reaction solution was heated under vacuum, heated at 70 °C and stirred for 30 h to obtain the spinning stock solution polyamic acid, and placed Store at -20°C. Prepare 10wt% po...
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