Anion exchange membrane based on fluorinated polybenzimidazole and preparation method of anion exchange membrane

An anion exchange membrane, benzimidazole technology, applied in the anion exchange membrane based on fluorinated polybenzimidazole and its preparation, the field of anion exchange membrane, can solve the problem of poor dimensional stability of electrolyte membrane, human and environmental hazards, poor mechanical properties and other problems, to achieve the effect of excellent mechanical properties, low water absorption, and avoidance of use

Active Publication Date: 2018-09-28
CHANGZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, the traditional quaternary ammonium membranes mainly have two deficiencies that need to be solved urgently: 1) The polymer electrolyte membranes for alkaline fuel cells are mainly based on quaternary ammonium salt alkaline polymers, and the quaternary ammonium polymer electrolyte membranes have poor dimensional stability and water absorption. 2) In the preparation process of traditional quaternary ammonium salt polymers, the highly toxic substance chloromethyl ether is one of the indispensable raw materials, which makes the preparation of alkaline anion exchange membranes difficult Harmful to human body and environment

Method used

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  • Anion exchange membrane based on fluorinated polybenzimidazole and preparation method of anion exchange membrane
  • Anion exchange membrane based on fluorinated polybenzimidazole and preparation method of anion exchange membrane
  • Anion exchange membrane based on fluorinated polybenzimidazole and preparation method of anion exchange membrane

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Embodiment 1

[0028] The present embodiment provides a kind of preparation method based on the anion exchange membrane of fluorinated polybenzimidazole, it comprises the following steps:

[0029] (a) Preparation of organic salt monomer: Dissolve 0.96g (0.01mol) of 1,2-dimethylimidazole in 20ml of ethyl acetate, stir until dissolved, add 2.44g (0.01mol) of 1, 6-dibromohexane, reacted for 12 hours, and a white precipitate was generated; the crude product was washed with ethyl acetate, left to stand, separated and purified; repeated three times to obtain an organic salt monomer, and its molecular structure was: (The preparation method of following other imidazole-containing structure organic salt monomers is referring to this step);

[0030] (b) 0.30g (0.559mmol) fluorine-containing polybenzimidazole and (0.37g, 1.118mmol) was dissolved in dimethyl sulfoxide, stirred and reacted at 60°C for 24 hours, then poured the reaction solution into a clean polytetrafluoroethylene mold, and dried at 7...

Embodiment 2

[0033] The present embodiment provides a kind of preparation method of the anion-exchange membrane based on fluorinated polybenzimidazole, and it is basically the same as that in Example 1, and difference is: what used in step (a) is 1-methylimidazole; The performance parameters of the obtained anion exchange membrane are: water absorption at room temperature is 28.33%, swelling degree is 6.54%, ion exchange capacity is 2.32mmol / g, tensile strength is 43.02MPa, ion conductivity at room temperature can reach 21.22mS / cm, 80 The ionic conductivity at ℃ was 53.09mS / cm; the membrane was soaked in 2M KOH at 60℃ for 300h, and the ionic conductivity was measured again at room temperature, which was 20.98mS / cm, which proved that it had good alkali resistance.

Embodiment 3

[0035] This embodiment provides a method for preparing an anion exchange membrane based on fluorinated polybenzimidazole, which is basically the same as that in Example 1, except that 1-methyl-2- Ethyl imidazole; the performance parameters of the anion exchange membrane measured are: water absorption at room temperature is 24.32%, swelling degree is 6.02%, ion exchange capacity is 2.18mmol / g, tensile strength is 44.21MPa, and ion conductivity at room temperature can reach 19.67 mS / cm, ionic conductivity at 80°C is 47.02mS / cm; soak the membrane in 60°C, 2M KOH for 300h, and measure its ionic conductivity again at room temperature, which is 19.54mS / cm, which proves that it has good resistance alkaline.

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Abstract

The invention relates to an anion exchange membrane based on fluorinated polybenzimidazole and a preparation method of the anion exchange membrane. The general structure formula of the anion exchangemembrane based on the fluorinated polybenzimidazole comprises a repetitive unit as shown in formula (1), in formula as shown in specification, n is degree of polymerization; x is an integer of 2-12, yis an integer of 0-11; and R is H, methyl, ethyl, isopropyl or phenyl. The prepared membrane has excellent mechanical property, alkali resistance, heat resistance, low water absorption and high electrical conductivity; and moreover, the preparation process of the membrane is relatively simple and safe, and chloromethyl ether as a cancerogenic substance used in a preparation process of a traditional quaternary ammonium salt type anion membrane is avoided.

Description

technical field [0001] The invention belongs to the field of polymer materials and relates to an anion exchange membrane, in particular to an anion exchange membrane based on fluorinated polybenzimidazole and a preparation method thereof. Background technique [0002] Polymer electrolyte membrane fuel cells have attracted widespread attention because of their high efficiency and clean characteristics. According to the different types of polymer membranes, polymer electrolyte membranes can be divided into proton exchange membrane fuel cells and alkaline anion exchange membrane fuel cells. At present, the proton conductivity of the acidic polymer membrane represented by Nafion is strongly dependent on water. When the temperature is higher than 90 ° C, the evaporation of water will make it lose the proton conductivity, which limits the high-performance design and application environment of PEMFCs, making The advantages of PEMFCs working at high temperatures (improved CO tolera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/18H01M8/103H01M8/1072
CPCC08G73/18H01M8/103H01M8/1072Y02E60/50
Inventor 林本才徐斐袁文森陈乾储富强丁建宁袁宁一
Owner CHANGZHOU UNIV
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