Method for preparing cross-linked alkaline anion exchange membrane based on flexible long side chain polycation structure

A basic anion and polycation technology, applied in the direction of climate sustainability, final product manufacturing, sustainable manufacturing/processing, etc., can solve problems such as low electrical conductivity and poor chemical stability, and achieve improved mechanical properties and ease mechanical strength Effect

Inactive Publication Date: 2020-01-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many challenges on the road to the commercialization of alkaline polymer fuel cells. As a key material, alkaline anion exchange membranes have two major problems: low electrical conductivity and poor chemical stability in alkaline environments.

Method used

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  • Method for preparing cross-linked alkaline anion exchange membrane based on flexible long side chain polycation structure
  • Method for preparing cross-linked alkaline anion exchange membrane based on flexible long side chain polycation structure
  • Method for preparing cross-linked alkaline anion exchange membrane based on flexible long side chain polycation structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Copolymerization into polymer backbone

[0037] Dissolve 2.5g of biphenyl in 6mL of dichloromethane, and add a mixed reagent consisting of N-methylpiperidone and 1,1,1-trifluoroacetone in a molar ratio of 1:0 under the protection of nitrogen atmosphere, wherein N-methylpiperidone 1.2 mL. Then trifluoroacetic acid and trifluoromethanesulfonic acid were added as catalysts, the molar ratio of trifluoroacetic acid and trifluoromethanesulfonic acid was 1:6, and 1.8 mL of trifluoroacetic acid was added. The reaction was carried out under ice bath for 2h. The reaction mixture was poured into 1M NaOH precipitant for precipitation, washed with deionized water to neutrality, and vacuum-dried at 40°C for 48 hours to obtain a polymer: a copolymerized biphenyl-based oxygen-free main chain with a functionalization degree of 1 mmol g -1 .

[0038] (2) Preparation of ionization reagent

[0039] Take 2 mL of butanediamine and add it to ethanol to form a dropwise volume fraction ...

Embodiment 2

[0047] (1) Copolymerization into polymer backbone

[0048] Dissolve 2.5g of biphenyl in 6mL of dichloromethane, and add a mixed reagent consisting of N-methylpiperidone and 1,1,1-trifluoroacetone in a molar ratio of 1:1 under the protection of nitrogen atmosphere, wherein N-methylpiperidone 1.2 mL. Then trifluoroacetic acid and trifluoromethanesulfonic acid were added as catalysts, the molar ratio of trifluoroacetic acid and trifluoromethanesulfonic acid was 1:7, and 1.8 mL of trifluoroacetic acid was added. The reaction was carried out under ice bath for 3.5h. The reaction mixture was poured into 1M NaOH solution for precipitation, washed with deionized water until neutral, and vacuum-dried at 70°C for 30 hours to obtain a polymer: a copolymerized biphenyl-based oxygen-free main chain with a functionalization degree of 0.5 mmol g -1 .

[0049] (2) Preparation of ionization reagent

[0050] 2 mL of butanediamine was added to ethanol to form a co-solution with a volume fracti...

Embodiment 3

[0058] (1) Copolymerization into polymer backbone

[0059] Dissolve 2.5g of biphenyl in 6mL of dichloromethane, and add a mixed reagent consisting of N-methylpiperidone and 1,1,1-trifluoroacetone with a molar ratio of 1:3 under the protection of nitrogen atmosphere, wherein N-methylpiperidone 1.2 mL. Then trifluoroacetic acid and trifluoromethanesulfonic acid were added as catalysts, the molar ratio of trifluoroacetic acid and trifluoromethanesulfonic acid was 1:8, and 1.8 mL of trifluoroacetic acid was added. The reaction was carried out under ice bath for 5h. The reaction mixture was poured into 1M NaOH precipitant for precipitation, washed with deionized water to neutrality, and vacuum-dried at 100°C for 12 hours to obtain a polymer: a copolymerized biphenyl-based oxygen-free main chain with a functionalization degree of 0.3 mmol g -1 .

[0060] (2) Preparation of ionization reagent

[0061] 2 mL of butanediamine was added to ethanol to form a co-solution with a volume ...

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Abstract

The invention provides a method for preparing a cross-linked alkaline anion exchange membrane based on a flexible long side chain polycation structure, and belongs to the field of fuel cell anion exchange membrane materials. The alkaline anion exchange membrane is prepared by subjecting a halogenated polycation cross-linking agent and a biphenyl polymer to a menshutkin reaction, including four steps composed of synthesis of a polymer main chain, ionization of a polymer membrane main chain, film casting, and alkali treatment. The method of the invention is simple. The polycation structure promotes the formation of a hydrophilic and hydrophobic microphase separation structure. The flexible long side chain cross-linked structure inhibits the water absorption and swelling of the membrane, improves the mechanical properties of the membrane on the basis of ensuring electrical conductivity, thereby mitigating the contradiction between the electrical conductivity and the mechanical strength, and improving the alkali stability of the ion exchange membrane.

Description

technical field [0001] The invention belongs to the field of fuel cell anion exchange membrane materials, and relates to a preparation method of a cross-linked alkaline anion membrane based on a flexible long side chain polycation structure. Background technique [0002] At present, energy shortage and environmental pollution have become the two most important problems faced by today's society. As a new type of clean energy, fuel cells have attracted widespread attention from all over the world. Alkaline polymer fuel cells have achieved rapid development due to their fast reaction kinetics, the use of non-precious metal catalysts, no carbonate crystallization, and low fuel permeability. [0003] However, there are still many challenges on the road to the commercialization of alkaline polymer fuel cells. As a key material, alkaline anion exchange membranes have two major problems: low electrical conductivity and poor chemical stability in alkaline environments. Therefore, ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1069H01M8/1072H01M8/1086H01M8/103C08G61/02
CPCH01M8/1069H01M8/1072H01M8/1086H01M8/103C08G61/02C08G2261/122C08G2261/146C08G2261/312H01M2008/1095Y02P70/50Y02E60/50
Inventor 张凤祥贾亚斌
Owner DALIAN UNIV OF TECH
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