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Side chain piperidine cation grafting type polybiphenyl alkaline membrane and preparation method thereof

A polybiphenyl alkaline and cationic technology, used in electrochemical generators, fuel cells, electrical components, etc., to achieve the effects of excellent thermal stability and high ionic conductivity

Pending Publication Date: 2022-05-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although considerable progress has been made in the study of polymer backbones and cationic groups, the development of practically useful anion exchange membranes (AEMs) remains a great challenge

Method used

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  • Side chain piperidine cation grafting type polybiphenyl alkaline membrane and preparation method thereof
  • Side chain piperidine cation grafting type polybiphenyl alkaline membrane and preparation method thereof
  • Side chain piperidine cation grafting type polybiphenyl alkaline membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation of 1-(3-bromopropyl)-1-methylpiperidine cationic grafted polybiphenyl (PBP-3-Pip) alkaline membrane, such as figure 1 As shown, it is the preparation process of 1-(3-bromopropyl)-1-methylpiperidine cationic grafted polybiphenyl (PBP-3-Pip) alkaline membrane in Example 1 of the present invention, and the specific steps are as follows :

[0057] (1) Preparation of polybiphenyl (PBP)

[0058] Biphenyl (1 g) and N-methylpiperidone (0.83 mL) were dissolved in dichloromethane (5 mL); then, a mixed liquid of trifluoromethanesulfonic acid (5 mL) and trifluoroacetic acid (0.5 mL) was added gradually. dropwise, and reacted at 0 °C for 6 h to obtain a wine-red viscous liquid. 2 CO 3 Precipitate in aqueous solution, soak at room temperature for 24 hours, and filter to obtain a white solid sample, which is fully washed with deionized water and dried to obtain polybiphenylpiperidine (PBP) polymer;

[0059] (2) Preparation of 1-(3-bromopropyl)-1-methylpiperidine (B...

Embodiment 2

[0066] The preparation of 1-(6-bromohexyl)-1-methylpiperidine cationic grafted polybiphenyl (PBP-6-Pip) alkaline membrane, such as Figure 4-2 As shown, it is the preparation flow chart of 1-(6-bromohexyl)-1-methylpiperidine cation-grafted polybiphenyl (PBP-6-Pip) alkaline membrane in Example 2 of the present invention; the specific preparation process as follows:

[0067] (1) Preparation of polybiphenyl (PBP)

[0068] With embodiment 1;

[0069] (2) Preparation of 1-(6-bromohexyl)-1-methylpiperidine (Br-6-Pip)

[0070] 1,6-Dibromohexane (1.5 mL), N-methylpiperidine (1 mL), and ethyl acetate (20 mL) were added to a round-bottomed flask, and nitrogen was passed through to react fully to obtain a white solid precipitate, which was evacuated. Filtration, purification with ethyl acetate, removal of excess reactant, and drying to give side chain piperidine cation 1-(6-bromohexyl)-1-methylpiperidine (Br-6-Pip);

[0071] (3) Preparation of 1-(6-bromohexyl)-1-methylpiperidine cati...

Embodiment 3

[0076] The preparation of 1-(8-bromooctyl)-1-methylpiperidine cationic grafted polybiphenyl (PBP-8-Pip) alkaline membrane, such as Figure 4-3 shown, is the preparation flow chart of 1-(8-bromooctyl)-1-methylpiperidine cation-grafted polybiphenyl (PBP-8-Pip) alkaline membrane in Example 3 of the present invention; the specific preparation The process is as follows:

[0077] (1) Preparation of polybiphenyl (PBP)

[0078] With embodiment 1;

[0079] (2) Preparation of 1-(8-bromooctyl)-1-methylpiperidine (Br-8-Pip)

[0080] 1,8-Dibromooctane (1.75 mL), N-methylpiperidine (1 mL), and ethyl acetate (20 mL) were added to a round-bottomed flask, and nitrogen was passed through to fully react to obtain a white solid precipitate. Filtration, purification with ethyl acetate, removal of excess reactant, and drying yielded the side chain piperidine cation 1-(6-bromohexyl)-1-methylpiperidine (Br-8-Pip);

[0081] (3) Preparation of 1-(8-bromooctyl)-1-methylpiperidine cationic grafted po...

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Abstract

The invention discloses a side chain piperidine cation grafting type polybiphenyl alkaline membrane and a preparation method thereof, and belongs to the technical field of fuel cell anion exchange membrane preparation. The preparation method comprises the following steps: (1) preparing a polybiphenyl skeleton; (2) preparing side chain piperidine cations; and (3) preparing the side chain piperidine cation grafting type polybiphenyl alkaline membrane. The side chain piperidine cation grafting type polybiphenyl alkaline membrane has high ionic conductivity and chemical stability, the hydroxyl ion conductivity can reach 117.1 mS / cm at the temperature of 80 DEG C, the ionic conductivity is only reduced by less than 13.6% after the side chain piperidine cation grafting type polybiphenyl alkaline membrane is soaked in a 2M NaOH solution for 1500 h at the temperature of 80 DEG C, and the side chain piperidine cation grafting type polybiphenyl alkaline membrane shows good chemical stability. In addition, the method provided by the invention has the characteristics of simple preparation process and low cost, and has wide application prospects in alkaline membrane fuel cells.

Description

technical field [0001] The invention relates to an alkaline membrane and a preparation method thereof, in particular to a side-chain piperidine cation-grafted polybiphenyl alkaline membrane and a preparation method thereof, belonging to the technical field of preparation of anion exchange membranes of fuel cells. [0002] technical background [0003] In recent years, anion exchange membrane fuel cells (AEMFCs) have received extensive attention due to a series of advantages such as allowing the use of non-noble metal catalysts and fast redox kinetics. As a key component in anion exchange membrane fuel cells (AEMFCs) for transporting hydroxide ions and sequestering fuels and oxidants, anion exchange membranes (AEMs) must maintain excellent durability, high ionic conductivity, and Thermal stability. [0004] The chemical stability of anion exchange membrane (AEM) mainly depends on the properties of the membrane material itself, especially the polymer backbone and grafted funct...

Claims

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Application Information

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IPC IPC(8): C08G10/00C08J5/22C08L61/18H01M8/103H01M8/1072
CPCC08G10/00C08J5/2256H01M8/103H01M8/1072C08J2361/18Y02E60/50
Inventor 朱红刘桥王芳辉
Owner BEIJING UNIV OF CHEM TECH
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