A gas separation membrane with shape memory properties

A gas separation membrane, memory technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., to achieve the effect of good gas separation selectivity and large specific surface area

Active Publication Date: 2019-12-27
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most polyimide gas separation membranes are difficult to change their inherent shape to achieve multifunctionality.
[0004] There are no reports on polyimide gas separation membranes with shape memory properties

Method used

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  • A gas separation membrane with shape memory properties
  • A gas separation membrane with shape memory properties
  • A gas separation membrane with shape memory properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing a gas separation membrane with shape memory performance:

[0028] 1. Add 4,4'-diaminodiphenyl ether (4.4mmol) into a 250 mL three-necked flask, add 36 mL N,N-dimethylacetamide, and then add 2-(4-aminobenzene base)-5-aminobenzoxazole (4.4mmol), stirred and dissolved under nitrogen atmosphere. Then 2,4,6-triaminopyrimidine (0.8 mmol) was added and mechanically stirred for 10 min.

[0029] 2. Weigh 4,4'-(hexafluoroisopropylene) diphthalic anhydride (10 mmol) and slowly add it to the diamine solution in step 1 in 5 times, and stir for 36 hours at room temperature under the protection of nitrogen to obtain a certain viscosity Polyamic acid solution.

[0030] 3. Vacuum and degas the polyamic acid solution at room temperature for 0.5 h, then pour it onto a glass substrate, raise the temperature from room temperature to 60°C, and keep it warm for 8h; then raise the temperature to 100°C, and keep it warm for 1h; continue to raise the temperature to 200°...

Embodiment 2

[0036] 1. Add 4,4'-diaminodiphenyl ether (4.25mmol) into a 250 mL three-neck flask, add 36 mL N,N-dimethylacetamide, and then add 2-(4-aminophenyl)- 5-Aminobenzoxazole (4.25 mmol), stirred and dissolved under nitrogen atmosphere. Then 2,4,6-triaminopyrimidine (1.0 mmol) was added and mechanically stirred for 10 min.

[0037] 2. Weigh 4,4'-(hexafluoroisopropylene) diphthalic anhydride (10 mmol) and slowly add it to the diamine solution in step 1 in 10 times, and stir for 72 hours at room temperature under the protection of nitrogen to obtain a certain viscosity polyamic acid solution.

[0038] 3. Vacuum and degas the polyamic acid at room temperature for 0.5 h, then pour it onto the glass substrate, raise the temperature from room temperature to 80°C, and keep it warm for 6h; then raise the temperature to 120°C, keep it warm for 1h; continue to raise the temperature to 220°C °C, keep warm for 1h; finally raise the temperature to 320°C, keep warm for 1h.

[0039] 4. Same as E...

Embodiment 3

[0042] 1. Add 4,4'-diaminodiphenyl ether (3.95mmol) into a 250 mL three-neck flask, add 36 mL of N,N-dimethylacetamide, and then add 2-(4-aminophenyl)- 5-Aminobenzoxazole (3.95 mmol), stirred and dissolved under nitrogen atmosphere. Then 2,4,6-triaminopyrimidine (1.4 mmol) was added and mechanically stirred for 20 min.

[0043] 2. Weigh 4,4'-(hexafluoroisopropylene) diphthalic anhydride (10 mmol) and slowly add it to the diamine solution in step 1 in 3 times, and stir for 48 hours at room temperature under the protection of nitrogen to obtain a certain viscosity polyamic acid solution.

[0044] 3. Vacuum and degas the polyamic acid at room temperature for 1.0 h, then pour it onto the glass substrate, raise the temperature from room temperature to 60°C, and keep it warm for 8h; then raise the temperature to 130°C, keep it warm for 1h; continue to raise the temperature to 230°C ℃, keep warm for 1h; continue to raise the temperature to 330°C, keep warm for 1h.

[0045] 4. Same...

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Abstract

The invention discloses a gas separation membrane having a shape memory property; the gas separation membrane is prepared by the steps: firstly, forming a copolymerized linear oligomer from dianhydride 4,4'-(hexafluoroisopropylidene)diphthalic anhydride, diamine 4,4'-diaminodiphenyl ether and 2-(4-aminophenyl)-5-aminobenzoxazole, then carrying out a reaction of the copolymerized linear oligomer with 2,4,6-triaminopyrimidine gradually to form hyperbranched macromolecules, and finally, carrying out thermal imidization to obtain a hyperbranched polyimide membrane. The hyperbranched polyimide membrane has large specific surface area and can achieve gas adsorption; by adjusting the stiffness and flexibility of a structure of polyimide, the hyperbranched polyimide membrane has different adsorption characteristics on different gases, so as to achieve gas separation characteristics. In addition, the hyperbranched polyimide has obvious glass transition temperature, the transition can be used as a shape memory reversible phase, mutual entanglement of macromolecular chains and intermolecular strong interaction force in the polyimide structure can be used as a stationary phase, and thus the hyperbranched polyimide is endowed with the shape memory property.

Description

technical field [0001] The invention relates to a gas separation membrane with shape memory performance. The gas separation membrane has good shape memory performance, gas separation and thermal stability. Background technique [0002] Shape memory polymer (SMP) is a class of smart materials that can fix a temporary shape under certain external conditions and return to the original shape when external stimuli such as heat, light, electricity, magnetism, etc. are applied again. SMP has broad application prospects in the fields of flexible electronic devices, biomedicine, and aerospace. The most common type of SMP is thermotropic SMP, including: polyurethane, polystyrene, epoxy resin and other SMP materials. But the glass transition temperature (T g ) are mostly lower than 120 °C, thus limiting the application of shape memory polymer materials in harsh environments, such as aerospace. In order to broaden the application of shape memory polymers in complex environments, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D67/00B01D69/02B01J20/26B01J20/28B01J20/30B01D53/02B01D53/22C08G73/10
CPCB01D53/02B01D53/228B01D67/0006B01D69/02B01D71/64B01D2325/24B01J20/265B01J20/28033B01J20/28057C08G73/1039C08G73/105C08G73/1078C08G73/1085
Inventor 王齐华杨增辉王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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