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Anion exchange polymer and preparation method and application thereof

An anion exchange membrane and anion technology, applied in the field of polymer materials, can solve the problems of difficulty in combining ionic conductivity, mechanical strength and anti-swelling performance, high cost of trifluoroacetophenone monomers, and unfavorable large-scale application. , to achieve excellent ionic conductivity and mechanical strength properties, good chemical stability, and the effect of improving energy conversion efficiency

Active Publication Date: 2020-04-21
惠州市亿纬新能源研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent can improve the mechanical strength of anion exchange polymers and reduce swelling by changing the ratio of trifluoroacetophenone monomers and biphenyl monomers, the cost of trifluoroacetophenone monomers is too high , which is not conducive to large-scale application
[0005] It can be seen that although anion-exchange polymers with good chemical stability can be obtained based on the above-mentioned prior art, it is difficult for anion-exchange polymers to have excellent ion conductivity, mechanical strength and anti-swelling properties, or the cost of monomers is too high

Method used

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  • Anion exchange polymer and preparation method and application thereof
  • Anion exchange polymer and preparation method and application thereof
  • Anion exchange polymer and preparation method and application thereof

Examples

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Embodiment 1

[0070] The present embodiment provides a kind of anion exchange polymer, structural formula is as follows:

[0071]

[0072] Wherein, x+y+z=100, (x+y) / (x+z)=2, x≥1, y≥1, z≥1, and the number average molecular weight of the anion exchange polymer is 280000.

[0073] This embodiment provides an anion exchange membrane prepared by anion exchange polymer.

[0074] The present embodiment also provides a kind of preparation method of anion exchange membrane, comprises the steps:

[0075]

[0076] (1) Synthesis of polymers containing piperidine tertiary amine groups: Weigh 4.94g (32.0mmol) of biphenyl and 3.68g (16.0mmol) of p-terphenyl in a 100mL three-necked flask, add 5.43g (48.0mmol) N-methyl-4-piperidone was added, and 15 mL of dichloromethane was added to dissolve the reactant. Add 50 mL of a mixed acid of trifluoromethanesulfonic acid and trifluoroacetic acid (the volume ratio of the two is 12:1) at 0° C., and react for 6 hours. The viscous purple product was poured in...

Embodiment 2

[0084] The only difference from Example 1 is that the 4.94g (32.0mmol) of biphenyl and 3.68g (16.0mmol) of p-terphenyl used in step (1) of Example 1 are modified to 3.70g during the preparation of the anion exchange membrane (24.0mmol) of biphenyl and 5.52g (24.0mmol) of p-terphenyl, and all the other preparation methods are the same as in Example 1.

[0085] The intermediate polymer containing piperidine tertiary amine groups and the anion exchange polymer provided in this example are characterized by NMR, and the H NMR spectra obtained are as follows: Image 6 and Figure 7 shown; from Figure 7 It can be seen that the H characteristic peak position of the anion exchange polymer obtained in Example 2 is approximately the same as that of the anion exchange polymer obtained in Example 1. The difference is that in the anion exchange polymer obtained by the quaternization reaction in Example 2, the ratio of the peak area of ​​the methyl H linked to the nitrogen atom to the sum...

Embodiment 3

[0088] The structural formula of anion exchange polymer in the present embodiment is as follows:

[0089]

[0090] Wherein, x+y+z=100, (x+y) / (x+z)=2, x≥1, y≥1, z≥1, and the number average molecular weight of the anion exchange polymer is 296000.

[0091] The difference between the preparation method of the anion exchange membrane and Example 1 is only that the biphenyl of 4.94g (32.0mmol) and the p-terphenyl of 3.68g (16.0mmol) used in the embodiment are changed into weighing 4.94g (32.0mmol) ) of biphenyl and 3.68g (16.0mmol) of m-terphenyl, and all the other preparation methods are the same as in Example 1.

[0092] The intermediate polymer containing the piperidine tertiary amine group obtained in step (1) is carried out nuclear magnetic analysis, and its nuclear magnetic hydrogen spectrogram is as follows Figure 8 As shown, the chemical shift (δ) 2.50ppm is the DMSO solvent peak, δ2.85ppm and δ3.35ppm correspond to the characteristic peaks of methylene H on the piperi...

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Abstract

The invention provides an anion exchange polymer and a preparation method and application thereof. The anion exchange polymer comprises at least one structural unit as shown in a formula (I) and a structural unit as shown in a formula (II); the anion exchange polymer further comprises at least one structural unit as shown in a formula (III) and / or formula (IV); the main chain of the anion exchangepolymer contains biphenyl, terphenyl and piperidine quaternary ammonium cation structural units at the same time, so the anion exchange polymer has high chemical stability, excellent ionic conductivity, mechanical strength and swelling resistance, and can meet the application requirements of different electrochemical devices such as fuel cells, water electrolyzers and electrodialyzers.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to an anion exchange polymer and its preparation method and application, in particular to an anion exchange polymer, an anion exchange polymer solution, an anion exchange membrane and its preparation method and application. Background technique [0002] Anion exchange polymers have anion exchange and anion conduction functions, and are key materials in devices such as alkaline membrane fuel cells, alkaline water electrolyzers, and electrodialyzers. Ionic conductivity, chemical stability, and mechanical properties are key properties of anion-exchange polymers, which directly affect the energy conversion efficiency and lifetime performance of devices such as fuel cells and water electrolyzers. At present, there are many types of anion exchange polymers with OH at 80°C - The conductivity exceeds 100mS / cm (J. Pan, et al. Energy Environ. Sci., 2014, 7, 354), which can meet the application...

Claims

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Application Information

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IPC IPC(8): C08G61/12C08G61/10C08J5/22C08L65/00
CPCC08G61/122C08G61/10C08J5/2256C08J2365/00C08G2261/122C08G2261/344C08G2261/312C08G2261/334C08G2261/72C08G2261/90
Inventor 汪瀛庄林袁中直刘金成
Owner 惠州市亿纬新能源研究院
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