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Side-chain amphoteric structure polyarylethersulfone, preparation method thereof and homogeneous amphoteric ion exchange film

A technology of polyarylethersulfone and side chains, which is applied in the field of homogeneous amphoteric ion exchange membranes, and can solve the problems of reduced elongation at break, etc.

Active Publication Date: 2020-08-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

5.0 mA cm -2 Under the condition, Cl - / SO 4 2- The selectivity is as high as 12.5, indicating that this structure has significantly superior performance, but the covalently cross-linked structure reduces the elongation at break of the film (<8%) (J.Membr.Sci.577(2019)153–164)

Method used

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  • Side-chain amphoteric structure polyarylethersulfone, preparation method thereof and homogeneous amphoteric ion exchange film
  • Side-chain amphoteric structure polyarylethersulfone, preparation method thereof and homogeneous amphoteric ion exchange film
  • Side-chain amphoteric structure polyarylethersulfone, preparation method thereof and homogeneous amphoteric ion exchange film

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Preparation of 3,3'-dibromo-4,4'-difluorodiphenylsulfone (db-DFPS): Weigh 25.4 grams of 4,4'-difluorodiphenylsulfone (0.10mol) in a 250mL round bottom flask , and then add 150mL of concentrated sulfuric acid, stir and dissolve at 25°C in a nitrogen atmosphere. Then, 14.2 g (0.22 mol) of N-bromosuccinimide (NBS) was added in batches in 3 batches, with an interval of 15 min between each batch, and rapid stirring was maintained for 6 h. The resulting mixture was poured into 500 mL of ice water. The precipitate was obtained by filtration, and then washed with 600 mL of deionized water and 100 mL of n-hexane, respectively. Finally, it is purified by crystallization from toluene. Vacuum drying at 60°C for 12 hours yielded 18.3 g of db-DFPS.

[0069] Preparation of bis(4-fluoro-3-(3-butenoic acid sodium)phenyl)sulfone (m-DFPS): Weigh 8.0 g (19.4 mmol) of 3,3'dibromo-4,4'difluorobis Phenylsulfone, 4.70 grams (41.2 mmol) of sodium 3-butenoate, 0.262 grams (1.07 mmol) of pall...

Embodiment 1-2

[0075] Preparation of side-chain type polyarylethersulfone amphoteric ion exchange membrane: 2.8 g of side-chain type amphoteric polyarylethersulfone prepared in Example 1 was dissolved in 60 mL of NMP solvent, mechanically stirred at 80°C until completely dissolved, Obtain the casting solution; degas the casting solution in vacuum, then pour the defoamed casting solution into a clean glass mold, dry it at 80°C to form a film, and vacuum dry it at 100°C to obtain a homogeneous side chain Type polyaryl ether sulfone amphoteric ion exchange membrane, the film thickness is 121μm (see image 3 ). The obtained amphoteric ion exchange membrane was soaked in 1.0M hydrochloric acid for 24 hours to convert the sodium form to the acid form, and soaked in deionized water for use.

[0076] Using the national standard method, it can be known through experiments that the IEC of the prepared side chain type polyaryl ether sulfone amphoteric ion exchange membrane is 2.21mmol g –1 , surface ...

Embodiment 2

[0078] Preparation of 3,3'-dibromo-4,4'-difluorodiphenylsulfone (db-DFPS): The same preparation process as in Example 1 was used to obtain db-DFPS.

[0079] Preparation of two (4-fluoro-3-(3-butenoic acid sodium) phenyl) sulfone (m-DFPS): using the same preparation process as in Example 1, two (4-fluoro-3-(3-butane) Sodium enoate) phenyl) sulfone.

[0080] 1-bromo-6-imidazolium salt hexane chain (Br-(CH 2 ) 6 -IM) Synthesis: Using the same preparation process as in Example 1, pure 1-bromo-6-methylimidazolium salt-alkane was obtained.

[0081] Preparation of side chain type amphoteric structure polyaryl ether sulfone: adopt the same preparation process as in Example 1, the only difference is the addition of 4,4'-difluorodiphenyl sulfone (9 mmol), bis(4-fluoro-3-(3 -sodium crotonate)phenyl)sulfone (1mmol) to give 10% molar content of bis(4-fluoro-3-(3-butenoate sodium)phenyl)sulfone, 2,2'-bis(3-amino The molar content of -4-hydroxyphenyl) hexafluoropropane is 7.8 grams of po...

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Abstract

The invention discloses side-chain amphoteric polyarylethersulfone, a preparation method thereof and a homogeneous amphoteric ion exchange film. The side chain type amphoteric structure polyarylethersulfone is composed of the following four kinds of repetitive structural units which are arranged randomly: a repetitive structural unit A, a repetitive structural unit B, a repetitive structural unitC and a repetitive structural unit D, the number-average molecular weight Mn of the side-chain amphoteric polyarylethersulfone is 50000-100000, and the number of the four repetitive structural units in the structure satisfies the following conditions: (a + b): (c + d) = 50-0%: 50-100%, and (a + c): (b + d) = 0-15%: 100-85%; the homogeneous side chain type amphoteric ion exchange film provided by the invention is a sodium type film prepared from polyarylethersulfone with a side chain type amphoteric structure, and then the sodium type is converted into an acid type. The ion exchange film has the advantages of low surface resistance, high ion conductivity, high mechanical property, good chemical stability, high monovalent anion selectivity, high monovalent anion flux and the like.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a side chain type amphoteric structure polyarylether sulfone, a preparation method thereof and a homogeneous amphoteric ion exchange membrane prepared from the side chain type amphoteric structure polyarylether sulfone. Background technique [0002] At present, ion exchange membranes have been widely used in many fields such as diffusion dialysis, electrodialysis, reverse electrodialysis, fuel cells, flow batteries, and sewage treatment (J.Membr.Sci.555(2018)429–454). Among them, the separation of mono- / divalent ions in mixed salt systems under electric drive is an important application of ion-exchange membranes. For example, in practical applications, the separation of the monovalent anion Cl in the monovalent / divalent mixed salt system – (or monovalent cation Na + ). However, at present, the vast majority of domestic commercial ionic membrane products are heterogeneous mem...

Claims

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Application Information

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IPC IPC(8): C08G75/23B01D67/00B01D69/02B01D71/68B01J43/00
CPCC08G75/23B01D71/68B01D69/02B01D67/0002B01J43/00B01D2325/42Y02E60/50
Inventor 廖俊斌俞欣妍沈江南
Owner ZHEJIANG UNIV OF TECH
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