CN116585911A - Preparation method of polyimide gas separation membrane with polyethylene glycol structure - Google Patents
Preparation method of polyimide gas separation membrane with polyethylene glycol structure Download PDFInfo
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- CN116585911A CN116585911A CN202310738621.9A CN202310738621A CN116585911A CN 116585911 A CN116585911 A CN 116585911A CN 202310738621 A CN202310738621 A CN 202310738621A CN 116585911 A CN116585911 A CN 116585911A
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- polyethylene glycol
- glycol structure
- gas separation
- separation membrane
- polyimide
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- 239000002202 Polyethylene glycol Substances 0.000 title claims abstract description 68
- 229920001223 polyethylene glycol Polymers 0.000 title claims abstract description 68
- 238000000926 separation method Methods 0.000 title claims abstract description 65
- 239000004642 Polyimide Substances 0.000 title claims abstract description 54
- 229920001721 polyimide Polymers 0.000 title claims abstract description 54
- 239000012528 membrane Substances 0.000 title claims abstract description 53
- 125000003827 glycol group Chemical group 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims description 51
- -1 2-aminopropyl Chemical group 0.000 claims description 20
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 20
- 239000000047 product Substances 0.000 claims description 16
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 15
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Natural products CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- WCZNKVPCIFMXEQ-UHFFFAOYSA-N 2,3,5,6-tetramethylbenzene-1,4-diamine Chemical group CC1=C(C)C(N)=C(C)C(C)=C1N WCZNKVPCIFMXEQ-UHFFFAOYSA-N 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 11
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- QHHKLPCQTTWFSS-UHFFFAOYSA-N 5-[2-(1,3-dioxo-2-benzofuran-5-yl)-1,1,1,3,3,3-hexafluoropropan-2-yl]-2-benzofuran-1,3-dione Chemical group C1=C2C(=O)OC(=O)C2=CC(C(C=2C=C3C(=O)OC(=O)C3=CC=2)(C(F)(F)F)C(F)(F)F)=C1 QHHKLPCQTTWFSS-UHFFFAOYSA-N 0.000 claims description 8
- 150000004984 aromatic diamines Chemical class 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000000944 Soxhlet extraction Methods 0.000 claims description 5
- 239000012300 argon atmosphere Substances 0.000 claims description 5
- 239000007810 chemical reaction solvent Substances 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 125000003944 tolyl group Chemical group 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 20
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 10
- 239000001569 carbon dioxide Substances 0.000 abstract description 10
- 229920005575 poly(amic acid) Polymers 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 239000003054 catalyst Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 8
- 238000000746 purification Methods 0.000 description 7
- 230000035699 permeability Effects 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000005357 flat glass Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001926 trapping method Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/58—Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
- B01D71/62—Polycondensates having nitrogen-containing heterocyclic rings in the main chain
- B01D71/64—Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a preparation method of a polyimide gas separation membrane with a polyethylene glycol structure, which comprises the following steps: preparing a polyamic acid solution; preparing a polyethylene glycol structure-polyimide product; preparing a polyethylene glycol structure-polyimide product into a film; and (5) preparing the polyimide gas separation membrane with the polyethylene glycol structure. The polyimide gas separation membrane with the polyethylene glycol structure prepared by the method has very high CO 2 /N 2 The separation performance of the catalyst improves the separation capacity of carbon dioxide.
Description
Technical Field
The invention relates to the technical field of gas separation membranes, in particular to a preparation method of a polyimide gas separation membrane with a polyethylene glycol structure.
Background
In recent years, the carbon dioxide emission is increased, which leads to the aggravation of greenhouse effect and global warming, thereby generating a series of climate and environmental problems, CO 2 Emission reduction has become an important topic of concern in various countries worldwide and in human society. Traditional carbon dioxide separationThe trapping method has the problems of complex process, high energy consumption, high pollution and the like, and the membrane separation technology removes CO in the flue gas and the energy source gas 2 Is a novel separation technology, and is characterized in that CO 2 There is great potential in trapping.
The membrane material is a key component of membrane separation technology, and has important significance in developing a high-performance gas separation membrane. For CO 2 The separated membrane material should have high air permeability, high selectivity, high mechanical strength, high stability and good film forming performance. There is a certain constraint relationship between the selectivity and permeability that determine the separation effect of membrane materials.
The traditional membrane material has low separation performance; under certain conditions CO 2 Can induce the plasticization of the polymer chain, and the permeation rate of other gases is increased more than that of CO after plasticization 2 The increase in permeation rate, and thus the gas selectivity, decreases, resulting in a decrease in the separation coefficient, affecting its range of application.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preparation method of a polyimide gas separation membrane with a polyethylene glycol structure.
The invention solves the technical problems by the following technical scheme:
the preparation method of the polyimide gas separation membrane with the polyethylene glycol structure comprises the following steps:
step 1, dissolving aromatic diamine in N-methyl-2-pyrrolidone solvent, adding dianhydride, uniformly mixing, reacting for 0.5-1.5 hours at normal temperature in argon atmosphere, adding polyethylene glycol structural material, and reacting for 11-13 hours to obtain amic acid solution;
step 2, adding an entrainer into the amic acid solution, carrying out imidization reaction for 4-6 hours at 160-180 ℃, cooling to room temperature, filtering, purifying and drying to obtain a polyethylene glycol structure-polyimide product;
step 3, adding the polyethylene glycol structure-polyimide product into dimethylformamide solvent, uniformly mixing, filtering in a filter, and coating filtrate on a tool plate into a film shape;
and 4, drying the coated tool plate at 50 ℃ for 2 days, then heating the tool plate in vacuum at the temperature gradually increased from 80 ℃ to 150 ℃ for 3 days, and finally heating the tool plate in vacuum at 200 ℃ for 14-16 hours to obtain the polyimide gas separation membrane with the polyethylene glycol structure.
In a preferred embodiment, in step 1, the aromatic diamine is 2,3,5, 6-tetramethyl-1, 4-phenylenediamine.
Preferably, in step 1, the dianhydride is 4,4- (hexafluoroisopropylidene) diphthalic anhydride.
Preferably, in step 1, the polyethylene glycol structural material is bis (2-aminopropyl) poly (ethylene oxide), the molar ratio of the aromatic diamine to the bis (2-aminopropyl) poly (ethylene oxide) is 3:1, the molar mass of the bis (2-aminopropyl) poly (ethylene oxide) is 2000g/mol, and the molar amount of the dianhydride added is the sum of the molar amounts of the aromatic diamine and the bis (2-aminopropyl) poly (ethylene oxide).
Preferably, in step 2, the entrainer is toluene.
Preferably, in step 2, the purification is by Soxhlet extraction to remove the reaction solvent.
Preferably, in step 2, the drying is carried out in a vacuum environment at 100 ℃ for 3 hours.
Preferably, in step 3 and step 4, the tool plate is a glass plate.
Preferably, in step 3, the filter is a 0.5 micron pore size filter.
The invention has the beneficial effects that: according to the preparation method, the introduced polyethylene glycol structural substances have selective adsorption contribution to specific carbon dioxide gas, the content of the polyethylene glycol structural substances is in linear relation with the diffusion of the carbon dioxide gas, and due to the synergistic effect between the diffusion and the adsorption, the selectivity and the permeability of the specific carbon dioxide gas in the separation membrane are remarkably improved, and the effective separation of a gas mixture is realized. Polyimide gas separation membranes of polyethylene glycol structure prepared by the preparation method of the invention have very high CO 2 /N 2 Improves the separation performance of the membrane for separating the carbon dioxideCapability.
Drawings
FIG. 1 is a schematic diagram of the steps of a preferred embodiment of the present invention.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.
Example 1
The preparation method of the polyimide gas separation membrane with the polyethylene glycol structure, as shown in fig. 1, comprises the following steps:
step 1, preparing a polyamic acid solution.
15.397g of 2,3,5, 6-tetramethyl-1, 4-phenylenediamine is taken and dissolved in 160mL of N-methyl-2-pyrrolidone solvent, 44.424g of 4,4- (hexafluoroisopropylidene) diphthalic anhydride is added, the mixture is uniformly mixed and then reacted for 1 hour at normal temperature in an argon atmosphere, 50g of polyethylene glycol structural material is added, and the reaction is carried out for 12 hours to obtain the polyamic acid solution.
Wherein the polyethylene glycol structural material is bis (2-aminopropyl) poly (ethylene oxide), the molar ratio of 2,3,5, 6-tetramethyl-1, 4-phenylenediamine to bis (2-aminopropyl) poly (ethylene oxide) is 3:1, the molar mass of the bis (2-aminopropyl) poly (ethylene oxide) is 2000g/mol, and the molar amount of the added 4,4- (hexafluoroisopropylidene) diphthalic anhydride is the sum of the molar amounts of the 2,3,5, 6-tetramethyl-1, 4-phenylenediamine and the bis (2-aminopropyl) poly (ethylene oxide).
And 2, preparing a polyethylene glycol structure-polyimide product.
30mL of toluene is added into the amic acid solution, imidization reaction is carried out for 5 hours at 160-180 ℃, the solution is cooled to room temperature, and the polyethylene glycol structure-polyimide product is obtained after filtration, purification and drying.
Wherein the purification is to remove the reaction solvent by Soxhlet extraction; drying is carried out in a vacuum environment at 100deg.C for 3 hours.
And 3, preparing the polyethylene glycol structure-polyimide product into a film.
1g of a polyethylene glycol structure-polyimide product is taken and added into 100mL of dimethylformamide solvent, and after being uniformly mixed, the mixture is filtered in a filter with the aperture of 0.5 micron, and the filtrate is coated into a film shape on a flat glass plate.
And 4, manufacturing a polyimide gas separation membrane with a polyethylene glycol structure.
The coated glass plate is dried for 2 days at 50 ℃, then the temperature is gradually increased from 80 ℃ to 150 ℃ in vacuum, the glass plate is heated for 3 days, and finally the glass plate is continuously heated for 15 hours at 200 ℃ in vacuum, so that the polyimide gas separation membrane with a polyethylene glycol structure is obtained.
And (3) performing performance test on the polyimide gas separation membrane with the polyethylene glycol structure obtained in the step (4). Test results show that the polyimide gas separation membrane with the polyethylene glycol structure has good CO 2 /N 2 Separation performance, CO 2 The permeability coefficient can reach 853Barrer, and the separation factor can reach 54.
The gas separation membrane obtained by the method of this example has improved performance compared to the existing gas separation membranes.
Example 2
The preparation method of the polyimide gas separation membrane with the polyethylene glycol structure, as shown in fig. 1, comprises the following steps:
step 1, preparing a polyamic acid solution.
30.794g of 2,3,5, 6-tetramethyl-1, 4-phenylenediamine is taken and dissolved in 160mL of N-methyl-2-pyrrolidone solvent, 88.848g of 4,4- (hexafluoroisopropylidene) diphthalic anhydride is added, the mixture is uniformly mixed and then reacted for 1 hour at normal temperature in an argon atmosphere, and 100g of polyethylene glycol structural substance is added and reacted for 12 hours to obtain the polyamic acid solution.
Wherein the polyethylene glycol structural material is bis (2-aminopropyl) poly (ethylene oxide), the molar ratio of 2,3,5, 6-tetramethyl-1, 4-phenylenediamine to bis (2-aminopropyl) poly (ethylene oxide) is 3:1, the molar mass of the bis (2-aminopropyl) poly (ethylene oxide) is 2000g/mol, and the molar amount of the added 4,4- (hexafluoroisopropylidene) diphthalic anhydride is the sum of the molar amounts of the 2,3,5, 6-tetramethyl-1, 4-phenylenediamine and the bis (2-aminopropyl) poly (ethylene oxide).
And 2, preparing a polyethylene glycol structure-polyimide product.
30mL of toluene is added into the amic acid solution, imidization reaction is carried out for 5 hours at 160-180 ℃, the solution is cooled to room temperature, and the polyethylene glycol structure-polyimide product is obtained after filtration, purification and drying. Wherein the purification is to remove the reaction solvent by Soxhlet extraction; drying is carried out in a vacuum environment at 100deg.C for 3 hours.
And 3, preparing the polyethylene glycol structure-polyimide product into a film.
1g of a polyethylene glycol structure-polyimide product is taken and added into 110mL of dimethylformamide solvent, and after being uniformly mixed, the mixture is filtered in a filter with the aperture of 0.5 micron, and the filtrate is coated into a film shape on a flat glass plate.
And 4, manufacturing a polyimide gas separation membrane with a polyethylene glycol structure.
The coated glass plate is dried for 2 days at 50 ℃, then the temperature is gradually increased from 80 ℃ to 150 ℃ in vacuum, the glass plate is heated for 3 days, and finally the glass plate is continuously heated for 15 hours at 200 ℃ in vacuum, so that the polyimide gas separation membrane with a polyethylene glycol structure is obtained.
And (3) performing performance test on the polyimide gas separation membrane with the polyethylene glycol structure obtained in the step (4). Test results show that the polyimide gas separation membrane with the polyethylene glycol structure has good CO 2 /N 2 Separation performance, CO 2 The permeability coefficient can reach 739Barrer, and the separation factor can reach 43.
The gas separation membrane obtained by the method of this example has improved performance compared to the existing gas separation membranes.
Example 3
The preparation method of the polyimide gas separation membrane with the polyethylene glycol structure, as shown in fig. 1, comprises the following steps:
step 1, preparing a polyamic acid solution.
15.397g of 2,3,5, 6-tetramethyl-1, 4-phenylenediamine is taken and dissolved in 160mL of N-methyl-2-pyrrolidone solvent, 44.424g of 4,4- (hexafluoroisopropylidene) diphthalic anhydride is added, the mixture is uniformly mixed and then reacted for 1 hour at normal temperature in an argon atmosphere, 50g of polyethylene glycol structural material is added, and the reaction is carried out for 12 hours to obtain the polyamic acid solution.
Wherein the polyethylene glycol structural material is bis (2-aminopropyl) poly (ethylene oxide), the molar ratio of 2,3,5, 6-tetramethyl-1, 4-phenylenediamine to bis (2-aminopropyl) poly (ethylene oxide) is 3:1, the molar mass of the bis (2-aminopropyl) poly (ethylene oxide) is 2000g/mol, and the molar amount of the added 4,4- (hexafluoroisopropylidene) diphthalic anhydride is the sum of the molar amounts of the 2,3,5, 6-tetramethyl-1, 4-phenylenediamine and the bis (2-aminopropyl) poly (ethylene oxide).
And 2, preparing a polyethylene glycol structure-polyimide product.
30mL of toluene is added into the amic acid solution, imidization reaction is carried out for 5 hours at 160-180 ℃, the solution is cooled to room temperature, and the polyethylene glycol structure-polyimide product is obtained after filtration, purification and drying. Wherein the purification is to remove the reaction solvent by Soxhlet extraction; drying is carried out in a vacuum environment at 100deg.C for 3 hours.
And 3, preparing the polyethylene glycol structure-polyimide product into a film.
1.5g of polyethylene glycol structure-polyimide product is taken and added into 100mL of dimethylformamide solvent, and after being uniformly mixed, the mixture is filtered in a filter with the aperture of 0.5 micron, and the filtrate is coated into a film shape on a flat glass plate.
And 4, manufacturing a polyimide gas separation membrane with a polyethylene glycol structure.
The coated glass plate is dried for 2 days at 50 ℃, then the temperature is gradually increased from 80 ℃ to 150 ℃ in vacuum, the glass plate is heated for 3 days, and finally the glass plate is continuously heated for 15 hours at 200 ℃ in vacuum, so that the polyimide gas separation membrane with a polyethylene glycol structure is obtained.
And (3) performing performance test on the polyimide gas separation membrane with the polyethylene glycol structure obtained in the step (4). Test results show that the polyimide gas separation membrane with the polyethylene glycol structure has good CO 2 /N 2 Separation performance, CO 2 The osmotic coefficient can reach 761Barrer, and the separation factor can reach 47.
The gas separation membrane obtained by the method of this example has improved performance compared to the existing gas separation membranes.
According to the preparation method, the introduced polyethylene glycol structural substances have selective adsorption contribution to specific carbon dioxide gas, the content of the polyethylene glycol structural substances is in linear relation with the diffusion of the carbon dioxide gas, and due to the synergistic effect between the diffusion and the adsorption, the selectivity and the permeability of the specific carbon dioxide gas in the separation membrane are remarkably improved, and the effective separation of a gas mixture is realized.
Polyimide gas separation membranes of polyethylene glycol structure prepared by the preparation method of the invention have very high CO 2 /N 2 The separation performance of the catalyst improves the separation capacity of carbon dioxide.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (9)
1. The preparation method of the polyimide gas separation membrane with the polyethylene glycol structure is characterized by comprising the following steps of:
step 1, dissolving aromatic diamine in N-methyl-2-pyrrolidone solvent, adding dianhydride, uniformly mixing, reacting for 0.5-1.5 hours at normal temperature in argon atmosphere, adding polyethylene glycol structural material, and reacting for 11-13 hours to obtain amic acid solution;
step 2, adding an entrainer into the amic acid solution, carrying out imidization reaction for 4-6 hours at 160-180 ℃, cooling to room temperature, filtering, purifying and drying to obtain a polyethylene glycol structure-polyimide product;
step 3, adding the polyethylene glycol structure-polyimide product into dimethylformamide solvent, uniformly mixing, filtering in a filter, and coating filtrate on a tool plate into a film shape;
and 4, drying the coated tool plate at 50 ℃ for 2 days, then heating the tool plate in vacuum at the temperature gradually increased from 80 ℃ to 150 ℃ for 3 days, and finally heating the tool plate in vacuum at 200 ℃ for 14-16 hours to obtain the polyimide gas separation membrane with the polyethylene glycol structure.
2. The method for producing a polyimide gas separation membrane having a polyethylene glycol structure according to claim 1, wherein in step 1, the aromatic diamine is 2,3,5, 6-tetramethyl-1, 4-phenylenediamine.
3. The method for producing a polyimide gas separation membrane having a polyethylene glycol structure according to claim 1, wherein in step 1, the dianhydride is 4,4- (hexafluoroisopropylidene) diphthalic anhydride.
4. The method for producing a polyimide gas separation membrane having a polyethylene glycol structure according to claim 1, wherein in step 1, the polyethylene glycol structure substance is bis (2-aminopropyl) poly (ethylene oxide), the molar ratio of the aromatic diamine to the bis (2-aminopropyl) poly (ethylene oxide) is 3:1, the molar mass of the bis (2-aminopropyl) poly (ethylene oxide) is 2000g/mol, and the molar amount of the dianhydride added is the sum of the molar amounts of the aromatic diamine and the bis (2-aminopropyl) poly (ethylene oxide).
5. The method for producing a polyimide gas separation membrane having a polyethylene glycol structure according to claim 1, wherein in step 2, the entrainer is toluene.
6. The method for producing a polyimide gas separation membrane having a polyethylene glycol structure according to claim 1, wherein in step 2, the reaction solvent is removed by Soxhlet extraction.
7. The method for producing a polyimide gas separation membrane having a polyethylene glycol structure according to claim 1, wherein in step 2, the drying is carried out at 100℃for 3 hours in a vacuum atmosphere.
8. The method for producing a polyimide gas separation membrane having a polyethylene glycol structure according to claim 1, wherein in step 3 and step 4, the tool plate is a glass plate.
9. The method for producing a polyimide gas separation membrane having a polyethylene glycol structure according to claim 1, wherein in step 3, the filter is a 0.5 μm pore size filter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117343547A (en) * | 2023-12-04 | 2024-01-05 | 宁波长阳科技股份有限公司 | Ag@ polypyrrole/polyethylene glycol-polyimide composite material, preparation method and pressure sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117343547A (en) * | 2023-12-04 | 2024-01-05 | 宁波长阳科技股份有限公司 | Ag@ polypyrrole/polyethylene glycol-polyimide composite material, preparation method and pressure sensor |
| CN117343547B (en) * | 2023-12-04 | 2024-02-27 | 宁波长阳科技股份有限公司 | Ag@ polypyrrole/polyethylene glycol-polyimide composite material, preparation method and pressure sensor |
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