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Polyarylethersulfone with side chain type aromatic main chain embedded with aliphatic chain, preparation method for polyarylethersulfone, and homogeneous anion exchange membrane

A polyarylethersulfone and aliphatic chain technology, applied in the field of homogeneous anion exchange membranes, can solve the problems of shortening the effective service life of the membrane, increasing the energy consumption of the separation process, and increasing the surface resistance of the membrane, achieving good chemical stability and mechanical properties , long-term stability, and broad application prospects

Active Publication Date: 2020-07-03
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the modified layer and the membrane matrix only interact with weak van der Waals force. As the electrodialysis process progresses, the modified layer is easy to fall off from the membrane surface, shortening the effective service life of the membrane; Miscellaneous modification, this method is to add modified materials into the casting solution, and use some characteristics of modified materials to change the performance of anion exchange membranes, such as adding graphene materials to adjust the density and hydrophobicity of the membrane
However, the addition of modified materials often leads to an increase in the membrane surface resistance and an increase in energy consumption during the separation process; 3. To prepare a homogeneous anion exchange membrane, this method adjusts the structure of the polymer material, such as establishing a cross-linked network and introducing negatively charged groups. group, etc., to achieve the selective separation of anions by anion exchange membranes

Method used

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  • Polyarylethersulfone with side chain type aromatic main chain embedded with aliphatic chain, preparation method for polyarylethersulfone, and homogeneous anion exchange membrane
  • Polyarylethersulfone with side chain type aromatic main chain embedded with aliphatic chain, preparation method for polyarylethersulfone, and homogeneous anion exchange membrane
  • Polyarylethersulfone with side chain type aromatic main chain embedded with aliphatic chain, preparation method for polyarylethersulfone, and homogeneous anion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0055] Synthesis of 1,3-bis(4-hydroxyphenoxy)propane: In a 500mL three-necked round-bottomed flask, add hydroquinone (20mmol) and 1,3-dibromopropane (5mmol), and dissolve in 250mL anhydrous Ethanol was used as a solvent, and 0.2 g of sodium hydroxide was added as a hydrogen extraction agent. in N 2 Under the atmosphere, react at 80°C for 6h, then cool to room temperature, pour the reaction mixture into 1L of pure water, filter with suction to obtain a white solid, wash with pure water three times, dry in vacuum at 40°C for 24h, and then dry in vacuum at 60°C for 48h to obtain 1,3 - Bis(4-hydroxyphenoxy)propane, 95% yield.

[0056] Synthesis of 1-methyl-3-(3-bromopropane)-imidazolium bromide: Dissolve 30mmol 1-methylimidazole and 120mmol 1,3-dibromopropane in acetone, react at 40°C for 24h, and filter the resulting suspension A clear and colorless filtrate was obtained, and the acetone was removed by rotary evaporation at 40°C, then poured into 50 mL of ether, stirred and pre...

Embodiment 1-2

[0060] Preparation of side chain type aromatic main chain embedded fatty chain polyarylethersulfone anion exchange membrane (PAES-co3C-3CIM): dissolve 2.8g of side chain type aromatic main chain embedded fatty chain polyarylethersulfone prepared in Example 1-1 In 60mL NMP solvent, magnetically stir at 80°C until completely dissolved to obtain the casting solution; defoam the casting solution, and then apply the defoamed casting solution on a clean glass plate, bake at 80°C Dry to form a film to obtain a homogeneous anion exchange membrane with a film thickness of 94 μm.

Embodiment 2-1

[0062] Synthesis of 1,6-bis(4-hydroxyphenoxy)hexane: after replacing 1,3-dibromopropane in Example 1-1 with 1,6-dibromohexane, use the same method as in Example 1 In the same preparation process, in 1,6-two (4-hydroxyphenoxy) hexane.

[0063] Synthesis of 1-methyl-3-(3-bromopropane)-imidazolium bromide: the same preparation process as in Example 1-1 was adopted.

[0064] Preparation of amino-containing polyaryl ether sulfone with aromatic main chain embedded in aliphatic chain: replace 1,3-bis(4-hydroxyphenoxy)propane in Example 1-1 with 1,6-bis(4-hydroxybenzene After oxy)hexane, adopt same preparation process among the embodiment 1-1.

[0065] Preparation of side chain type aromatic main chain embedded fatty chain polyarylether sulfone: take 5.0 g of amino-containing polyaryl ether sulfone with aromatic main chain embedded fatty chain obtained in the previous step and 1-methyl-3-(3-bromopropane) - 7.4 g of imidazolium bromide salt, using the same preparation process as in E...

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Abstract

The invention discloses polyarylethersulfone with a side chain type aromatic main chain embedded with an aliphatic chain, a preparation method for the polyarylethersulfone, and a homogeneous anion exchange membrane. The polyarylethersulfone with the side chain type aromatic main chain embedded with the aliphatic chain has a molecular structure as shown in a formula (I) which is described in the specification, and is composed of two repetitive structural units which are arranged randomly in the structure. In the formula (I), x and 100-x represent the mole percentage x% and the mole percentage(100-x) of two repetitive structural units respectively; and x is in a range of 10-90. The number-average molecular weight Mn of the polyarylethersulfone with the side chain type aromatic main chain embedded with the aliphatic chain is 40000-100000; and in the formula, m is in a range of 3-6, and n is in a range of 3-12. The invention provides a homogeneous anion exchange membrane. The homogeneousanion exchange membrane is prepared from the polyarylethersulfone with the side chain type aromatic main chain embedded with the aliphatic chain, wherein the polyarylethersulfone is as shown in the formula (I). The anion exchange membrane prepared by using the method provided by the invention has an aliphatic chain-aromatic chain alternating structure, and has the advantages of excellent ionic conductivity, good chemical stability, high monovalent anion selectivity and the like.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a side chain type aromatic main chain embedded fatty chain polyarylether sulfone, a preparation method thereof and a homogeneous anion prepared from the side chain type aromatic main chain embedded fatty chain polyarylether sulfone exchange membrane. Background technique [0002] Electrodialysis to concentrate seawater to produce salt is a mature technology that has replaced the salt field method in Japan for more than 40 years. When the electrodialysis membrane stack is constructed using ordinary ion exchange membranes, the monovalent anion Cl – (or the monovalent cation Na + ) and polyvalent anions such as SO 4 2– , CO 3 2– etc. (or polyvalent metal cation Mg 2+ , Ca 2+ etc.) at the same time migrate to the concentrated chamber, with the increase of salt concentration in the concentrated chamber, CaSO 4 , CaCO 3 Salts with low solubility are easy to deposit on the m...

Claims

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Application Information

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IPC IPC(8): C08G75/23B01D61/42B01D67/00B01D71/68B01J41/13B01J47/12
CPCC08G75/23B01J41/13B01J47/12B01D61/422B01D67/0002B01D71/68
Inventor 廖俊斌陈权沈江南
Owner ZHEJIANG UNIV OF TECH
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