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Alkaline anion exchange membrane and preparation method thereof

A basic anion, exchange membrane technology, applied in the field of the preparation of anion exchange membranes, can solve the problems of reduced membrane conductivity, reduced membrane, membrane loss of ion-conducting ability, etc., to achieve good mechanical properties, surface uniformity, good chemical stability sexual effect

Active Publication Date: 2017-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both methods have certain disadvantages
Cross-linking will reduce the IEC of the membrane, thereby reducing the conductivity of the membrane, and the composite reinforcement will separate the ion-conducting part and the reinforcing part of the membrane, eventually causing the membrane to lose its ion-conducting ability

Method used

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  • Alkaline anion exchange membrane and preparation method thereof
  • Alkaline anion exchange membrane and preparation method thereof
  • Alkaline anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 2 g of a poly(styrene-ethylene-butylene) block copolymer with a molecular weight of about 70,000 and a styrene content of 30% was dissolved in 30 mL of CCl 4 Add 3.5g of anhydrous tin tetrachloride and 4g of 1,4-dichloromethoxybutane sequentially under the condition of ice-water bath (~5°C), stir for 0.5h under the condition of ice-water bath, and then under the condition of 17°C Under reaction 12h. After the reaction solution returned to room temperature, it was poured into ethanol to precipitate a light yellow solid, which was dissolved in tetrahydrofuran and then precipitated with ethanol. The operation was repeated three times, and then the solid was vacuum-dried at room temperature for 12 hours to obtain chloromethylated poly(styrene - ethylene-butene) block copolymers.

[0062] Dissolve 0.5 g of the above-prepared chloromethylated poly(styrene-ethylene-butylene) block copolymer in 10 mL of tetrahydrofuran, slowly add 25 mg of NaH, and then add 0.25 g of polyethyl...

Embodiment 2

[0075] Dissolve 2 g of poly(styrene-ethylene-butylene) block copolymer with a molecular weight of about 440,000 and 50% styrene content in 120 mL of tetrachloroethane, and add 10 g of ZnCl successively under ice-water bath conditions 2 1. 20 g of chloromethylhexyl ether, stirred for 1 h in an ice-water bath, and then reacted at 20° C. for 4 h. After the reaction solution returned to room temperature, it was poured into ethyl acetate to precipitate a light yellow solid, which was washed three times with ethyl acetate, and then the solid was dried in vacuum at 30°C for 12 hours to obtain chloromethylated poly(styrene-ethylene-butylene ) block copolymers.

[0076] Dissolve 0.3 g of the above-prepared chloromethylated poly(styrene-ethylene-butylene) block copolymer in 18 mL of tetrahydrofuran, slowly add 0.15 g of NaH, and then add 0.1 g of polyethylene glycol monomer with a molecular weight of 1000 Methyl ether was heated and stirred at 30°C for 24 hours. After the reaction solu...

Embodiment 3

[0080] 2 g of polystyrene with a molecular weight of 104,000 was dissolved in 60 mL of 98 wt % concentrated sulfuric acid, 10 g of 1,4-dichloromethoxybutane was added in an ice-water bath, and the reaction was stirred for 24 h in an ice-water bath. The reaction solution was poured into methanol to precipitate a white solid, and the solid was vacuum-dried overnight at 20° C. to obtain chloromethylated polystyrene.

[0081] Dissolve 0.5 g of the above-prepared chloromethylated polystyrene in 5 mL of dimethylacetamide, slowly add 0.1 g of potassium tert-butoxide, then add 2.0 g of polyethylene glycol monomethyl ether with a molecular weight of 350, and Stir the reaction at 20°C for 48 hours, pour the reaction solution into ethanol, and precipitate a slightly yellowish colloidal solid, which is fully washed with ethanol, and dried in a vacuum oven at room temperature for 48 hours. According to the nuclear magnetic spectrum analysis of chloromethylated polystyrene and band hydropho...

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Abstract

An alkaline anion exchange membrane comprises a polystyrene or poly(styrene-ethylene- butylene) segmented copolymer main chain; and the phenyl containing part of the polystyrene or poly(styrene-ethylene- butylene) segmented copolymer main chain is bonded with a cation functional group or a long hydrophobic side chain through methylene; wherein the molecular weight of polystyrene is greater than 100000, and the molecular weight of the poly(styrene-ethylene- butylene) segmented copolymer is greater than 40000. Compared with the prior art, the membrane casting technology is easy, large area membranes can be produced massively, the prepared alkaline anion exchange membrane with a long hydrophobic side chain has a uniform, smooth, and compact surface; the conductivity can reach 80 S / cm, the requirements of fuel cells on the conductivity of the alkaline anion exchange membrane can be met; the membrane also has good mechanical properties, the breaking elongation rate can reach 500%, the chemical stability is good, the stability time is longer than 3000 hours in a high temperature alkaline environment, the thermal stability is good, and the glass-transition temperature is higher than 180 DEG C.

Description

technical field [0001] The invention belongs to the field of alkaline anion exchange membranes, and specifically relates to an alkaline anion exchange membrane with higher electrical conductivity and better mechanical properties; the invention also relates to an alkaline membrane with higher electrical conductivity and better mechanical properties. Preparation of anion exchange membranes. Background technique [0002] At present, alkaline anion exchange membranes have shown good application prospects in many electrochemical devices such as alkaline anion exchange membrane fuel cells, water electrolysis cells, flow batteries, and metal-air batteries. However, the current performance of alkaline anion exchange membranes (AAEMs) is far from meeting the requirements of these device applications, especially under discharge and strong alkali conditions, the stability and conductivity of AAEMs are greatly challenged. Therefore, the research and development of alkaline anion exchan...

Claims

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Application Information

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IPC IPC(8): C08F8/18C08F8/00C08F112/08C08F293/00C08J5/22C08G81/02
Inventor 孙公权杨丛荣王素力马文佳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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