Preparation method of anionic polymer membrane with high chemical stability

A technology of anionic polymer and chemical stability, applied in the field of preparation of anionic polymer membrane, can solve problems such as development space limitation, and achieve the effects of good mechanical strength, good chemical stability and high ionic conductivity

Inactive Publication Date: 2018-04-13
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of fuel cell relies on noble metal catalysts and expensive Nafion proton exchange membranes, and its development space is greatly limited.

Method used

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  • Preparation method of anionic polymer membrane with high chemical stability
  • Preparation method of anionic polymer membrane with high chemical stability
  • Preparation method of anionic polymer membrane with high chemical stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 41.0 mmol of biphenyl into a 150 mL three-necked flask, add 42.0 mmol of 1-methyl-4-piperidone, and add 8.6 mL of dichloromethane to dissolve the reactant. Under the condition of an ice-water bath, 32 mL of a mixed acid of trifluoromethanesulfonic acid and trifluoroacetic acid was added, the volume ratio of the two was 15:1, and the mixture was reacted for 3 hours. The product was precipitated in potassium carbonate solution, washed thoroughly with deionized water, and dried in an oven at 60-80°C for 24 hours. The initial polymer feed is obtained.

[0025] Weigh 10.0mmol of the above-mentioned polymer and add it into 1-methyl-2-pyrrolidone to dissolve it, and make a polymer solution with a mass fraction of 33.3-66.7 mg / mL, add 18.5-20 times the equivalent of methyl iodide at 40-60°C The reaction was carried out for 8-16 hours to obtain quaternized polymers with different reaction efficiencies. After the reaction was completed, it was precipitated in diethyl ethe...

Embodiment 2

[0031] The initial polymer raw material was synthesized according to the method of Example 1.

[0032] Weigh 10.0 mmol of the initial polymer raw material and add it to 1-methyl-2-pyrrolidone to dissolve it, and prepare a polymer solution with a mass fraction of 33.3-66.7 mg / mL, add 30-35 times the equivalent of ethyl bromide at 70- React at 75°C for 24 hours. After the reaction was completed, it was precipitated in diethyl ether to obtain a light white powdery solid, which was washed repeatedly with diethyl ether. A quaternized ionic polymer is obtained.

[0033]Soak the ionic polymer obtained above in 60°C 1mol / L KOH solution for 24 hours to fully exchange bromide ions into hydroxide ions. The solid was then centrifuged and washed several times until the supernatant was neutral. The resulting white solid was dried in an oven at 60-100° C. for 24-48 hours to obtain a white powdery solid. Dissolve the above solid in dimethyl sulfoxide, cast it on a glass plate, and dry it ...

Embodiment 3

[0036] Weigh 41.0 mmol of biphenyl into a 150 mL three-necked flask, add 43.0 mmol of 1-ethyl-4-piperidone, and add 8.0 mL of dichloromethane to dissolve the reactant. Under the condition of an ice-water bath, 32 mL of a mixed acid of trifluoromethanesulfonic acid and trifluoroacetic acid was added, with a volume ratio of 15:1, and reacted for 2 hours. The product was precipitated in potassium carbonate solution, washed thoroughly with deionized water, and dried in an oven at 60-80°C for 24 hours. The initial polymer feed is obtained.

[0037] Weigh 10.0mmol of the above-mentioned polymer and add it into 1-methyl-2-pyrrolidone to dissolve it to form a polymer solution with a mass fraction of 33.3-66.7 mg / mL, add 20-22 times the equivalent of methyl iodide and heat it at 70-75°C The reaction was carried out for 20-30 hours to obtain quaternized polymers with different reaction efficiencies. After the reaction was completed, it was precipitated in diethyl ether to obtain a yel...

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Abstract

The invention discloses a preparation method of an anionic polymer membrane with the high chemical stability, and belongs to the field of ionic polymer membranes. The preparation method comprises thesteps that under catalysis of mixed superacid, an aryl compound and an N-alkyl-4-piperidone compound generate an addition condensation reaction to obtain a linear polymer with high molecular weight and narrow molecular weight distribution; and quaternization modification is conducted on a nitrogen heterocycle on a polymer chain with methyl iodide or alkyl bromide, the obtained quaternized ionic polymer is soaked in a concentrated strong alkaline solution for ion exchange, washing and drying are conducted, and finally the obtained ion polymer is subjected to dissolution casting. According to the preparation method, the experiment process is simple and efficient, and the obtained anionic polymer membrane has the high ionic conductivity and ionic exchange capacity and is very excellent in chemical and heat stability and mechanical strength. The anionic polymer membrane has the very good application prospect and development potential in the alkaline polymer fuel cell field and has the great advantage compared with an anionic polymer membrane applied to a fuel cell at the present stage.

Description

technical field [0001] The invention belongs to the field of ionic polymer membranes, and relates to a preparation method of an anionic polymer membrane with high chemical stability. Background technique [0002] In recent years, fuel cell technology has developed rapidly, especially proton exchange membrane fuel cell technology has been applied to vehicle power systems. Toyota Motor Corporation of Japan launched a new fuel cell vehicle Mirai in 2014. The battery technology used is the proton exchange membrane fuel cell technology. However, this type of fuel cell relies on noble metal catalysts and expensive Nafion proton exchange membranes, and its development space is greatly limited. In contrast, alkaline polymer electrolyte fuel cells have great advantages. It can both get rid of the dependence on noble metals, and the preparation of anionic polymer membranes is also very cheap and versatile. And it has been applied in practical alkaline polymer electrolyte fuel cells...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1072H01M8/1081H01M8/1086C08G61/12
CPCC08G61/122C08G2261/124C08G2261/3221H01M8/1072H01M8/1081H01M8/1086Y02E60/50
Inventor 庄林彭汉青胡梅雪陈胜
Owner WUHAN UNIV
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