Polyaryl anion exchange membrane and preparation method thereof

An anion-exchange membrane and polyaryl-based technology, which is applied in the field of anion-exchange membrane fuel cells, can solve the problems of reduced mechanical properties and shortened membrane life, and achieve good mechanical properties, improved alkali resistance, and simple and efficient methods.

Pending Publication Date: 2022-05-24
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

The polymer skeleton acts as a cation loading site and supports the film formation. The breakage of the polymer skeleton (main chain) will lead to a sharp decline in t

Method used

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  • Polyaryl anion exchange membrane and preparation method thereof
  • Polyaryl anion exchange membrane and preparation method thereof
  • Polyaryl anion exchange membrane and preparation method thereof

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preparation example Construction

[0063] A kind of preparation method of polyaryl type anion exchange membrane, its steps are as follows:

[0064] (1) Preparation of cationic precursors

[0065] Pour 4-hydroxypiperidine into the container, add chloroform, then add potassium carbonate to the round-bottomed flask, stir, and finally add 1,5-dibromopentane to the stirring mixture slowly, and the heating reaction ends Then, it was precipitated with ethyl acetate and washed three times to obtain a cationic precursor, which was dried for later use;

[0066] (2) Preparation of side chain-containing spiro cations

[0067] The cationic precursor prepared in step (1) was added into the container, and DMF was added. After the raw materials were dissolved, NaH was added under ice bath conditions. After stirring for four hours, dibromoalkane was added. The supernatant is precipitated with ethyl acetate and washed three times to obtain cations containing side chains, which are dried for later use;

[0068] (3) Preparation...

Embodiment 1

[0077] A kind of preparation method of polyaryl type anion exchange membrane, its steps are as follows:

[0078] (1) Preparation of cationic precursors

[0079] Pour 4g 4-hydroxypiperidine into the container, add 60ml chloroform, then add 2g potassium carbonate to the round bottom flask, stir, and finally add 4.5ml 1,5-dibromopentane slowly to the stirring mixture , heated at 60 °C, reacted for 24 h, precipitated with 100 ml of ethyl acetate, and washed three times to obtain a cationic precursor, which was dried for later use;

[0080] (2) Preparation of side chain-containing spiro cations

[0081] Add 1.5 g of the cationic precursor prepared in step (1) into the container, add 20 ml of DMF, after the raw materials are dissolved, under ice bath conditions, add 0.6 g of NaH, and after stirring for four hours, add 3 ml of 1,5-dibromopentane alkane, heated at 60°C, and reacted for 48h, the supernatant in the flask was precipitated with 50ml of ethyl acetate, and washed three ti...

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Abstract

The invention discloses a polyaryl anion exchange membrane and a preparation method thereof, and belongs to the technical field of fuel cell materials, and the preparation method comprises the following steps: (1) preparing a cation precursor; (2) preparing spiro cations containing side chains; (3) preparation of a polyaryl piperidine polymer; (4) preparing a quaternized polyaryl piperidine polyelectrolyte; (5) preparing a polyaryl piperidine copolymer containing oxygen side chain type spiro cations; and (6) preparing the anion exchange membrane. The main chain of the synthesized polymer has no unstable ether bond, and meanwhile, the side chain type spiro cation is added, so that the membrane has strong alkali resistance. Due to the addition of the hydrophobic block and the flexible side chain, the mechanical property of the membrane is improved, the swelling is reduced, the dimensional stability is improved, meanwhile, the hydrophilic/hydrophobic microphase separation structure of the anion exchange membrane is enhanced, an ion channel is formed in the membrane, the ion transmission rate is improved, and the membrane has relatively high ion conductivity; the method has a wide application prospect in alkaline anion exchange membrane fuel cells.

Description

technical field [0001] The invention relates to an anion exchange membrane and a preparation method thereof, in particular to a polyaryl type anion exchange membrane and a preparation method thereof, belonging to the technical field of anion exchange membrane fuel cells. [0002] technical background [0003] With the development of the new energy industry, fuel cells stand out in the field of new energy due to their advantages of high efficiency, environmental protection and sustainability. Among fuel cells, polyelectrolyte membrane fuel cells have been widely developed in aerospace, automobile, mobile power supply and so on. Polyelectrolyte membrane fuel cells are classified into proton exchange membrane fuel cells (PEMFC) and anion exchange membrane fuel cells (AEMFC) according to the type of ions transported. [0004] At present, proton exchange membrane fuel cells (PEMFCs) have been widely used, but their high cost limits the commercialization process. Compared with pr...

Claims

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Application Information

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IPC IPC(8): C08G61/12C08J5/22C08L65/00H01M8/103H01M8/1069H01M8/1072
CPCC08G61/122C08J5/2256H01M8/103H01M8/1069H01M8/1072C08G2261/124C08G2261/31C08G2261/3221C08G2261/72C08J2365/00Y02P70/50Y02E60/50
Inventor 朱红田琳
Owner BEIJING UNIV OF CHEM TECH
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