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Compound-type anion-exchange membrane and preparation method thereof

An anion-exchange membrane and composite technology, which is applied in the field of preparation of composite quaternized polyethersulfone anion-exchange membranes, can solve problems such as use restrictions, and achieve the effects of uniform structure, high ion conductivity, and good chemical stability

Inactive Publication Date: 2013-06-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the iodide reagent used is methyl iodide, which is a highly toxic control reagent, and its use is greatly restricted.

Method used

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  • Compound-type anion-exchange membrane and preparation method thereof
  • Compound-type anion-exchange membrane and preparation method thereof
  • Compound-type anion-exchange membrane and preparation method thereof

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[0031] The preparation method of the composite polyethersulfone anion exchange membrane involved in the present invention, by changing the structure of the aromatic dihalide (I), the aromatic dihydric phenol (II) with chloromethylation reaction active sites and Polyethersulfone polymers (PES) with different structures were synthesized by the structure, ratio and dosing method of aromatic dihydric phenol (III) without reactive sites; by changing the amount of Friedel-Crafts reaction catalyst, reaction temperature and time to Control the degree of chloromethyl substitution of the polymer to obtain different types of chloromethylated polyethersulfone polymers (CMPES); then use the solution blending method to cast PES and CMPES with different mass ratios to form a film, and undergo a quaternization reaction And alkaline ion exchange to prepare anion exchange membrane. The steps are as follows:

[0032] The first step, the preparation of polyethersulfone polymer precursor (PES)

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Embodiment 1

[0066] Example 1: Preparation of composite quaternized polyethersulfone anion exchange membrane QPES(3 / 1)-3 / 7

[0067] Preparation of PES (3 / 1) polymer: In a completely dry four-neck flask equipped with nitrogen inlet and outlet devices, oil-water separator, and separatory funnel, under nitrogen protection, add 1.524g of DFDPS (6mmol) , 18 mL of NMP, 1.576 g of BHPF (4.5 mmol), 0.504 g of HFBPA (1.5 mmol), 0.954 g of potassium carbonate (6.9 mmol), and 18 mL of toluene. Slowly warming up to 140°C for reflux for 4h, the moisture generated by the reaction was removed in the form of toluene / water azeotrope. Then the temperature was slowly raised to 170°C, and the temperature was kept constant for 6h. After the reaction was over, the heating was stopped and cooled to room temperature. The product was slowly poured into about 500 mL of deionized water, and a white fibrous polymer product was precipitated. The product was fully washed with deionized water and dried in a vacuum ov...

Embodiment 2

[0071] Example 2: Preparation of composite quaternized polyethersulfone anion exchange membrane QPES(3 / 1)-4 / 6

[0072] Similar to the preparation method of QPES(3 / 1)-3 / 7 in Example 1, the difference is that the polymer precursor is mixed with the polymer after chloromethylation in a mass ratio of 4 / 6 during film formation Post-cast film.

[0073] Its performance data is shown in Table 1, and the conductivity at different temperatures is shown in figure 1 .

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Abstract

The invention discloses a preparation method for a novel compound-type anion-exchange membrane of a fuel cell. Polymer synthesis is finished through the three steps: (1) synthesizing a polyether sulfone polymer through an aromatic nucleophilic substitution reaction, wherein the polyether sulfone polymer is provided with active sites capable of conducting chloromethylation reaction; (2) introducing a chloromethyl group into the polyether sulfone polymer to synthesize a chloromethylation polyether sulfone polymer through a Friedel-crafts alkylation reaction; and (3) mixing the polyether sulfone polymer and the chloromethylation polyether sulfone polymer according to a certain mass ratio, and casting the membrane, conducting quaternization and alkalifying through a solvent casting method to obtain the compound-type anion-exchange membrane. Through changing of structures, percentages and feeding modes of an aromatic dihydric halide monomer and an aromatic dihydric phenol monomer, polyether sulfone polymers with different structures are obtained. According to the method, a synthetic process is simple, ion-exchange capacity is controllable, and the prepared anion-exchange membrane has the advantages of being uniform in structure, good in size stability, high in ionic conductivity and good in stability.

Description

technical field [0001] The invention belongs to a preparation technology of anion-exchange membranes, in particular to a preparation method of a composite quaternized polyethersulfone anion-exchange membrane. Background technique [0002] Anion exchange membranes have long been widely used in various industrial fields. Such as: the application in the process of gold electrolysis, the application of electrodialysis in water treatment to treat bitter brine, the use of anion membrane for diffusion dialysis in the recovery of industrial waste acid, as an anion selective electrode, and in the chlor-alkali industry as The diaphragm of the electrolyte, as the diaphragm in the battery, etc. [0003] As one of the key components in anion exchange membrane fuel cell (AEMFC), anion exchange membrane plays an important role in the development of AEMFC. Among them, the anion exchange membrane needs to meet the following conditions (1) It has excellent mechanical stability, thermal stab...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08L81/06C08G75/23B01J41/12B01J41/13
Inventor 胡朝霞陈守文唐卫芬武艺王飞龙张洪良毕慧平杨慧房世超
Owner NANJING UNIV OF SCI & TECH
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