A kind of preparation method of polymer anion exchange membrane
An anion exchange membrane and polymer technology, applied in the field of preparation of polymer anion exchange membranes, can solve the problems of low solubility and easy precipitation of imidazolium salt monomers, achieve simple and environmentally friendly preparation process, low technical equipment requirements, and high cost. film effect
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Embodiment 1
[0024] Preparation of double cation imidazolium salt
[0025] (1) Add 30ml of ethyl acetate as a solvent in a round-bottomed flask, then add 1-butylimidazole (6.21g, 0.05mol) and 1,6-dibromohexane (12.20g, 0.05mol) successively, at room temperature (25°C, the same below) after reacting for 12 hours with slight stirring, remove the solvent by rotary evaporation at 60°C to obtain a pale white viscous oily crude product, then wash with ethyl acetate and diethyl ether for several times, and remove the washing solvent by rotary evaporation again , to obtain a colorless transparent viscous oily product;
[0026] (2) Add the product (3.682g, 10mmol) and 1-vinylimidazole (1.129g, 12mmol) in the round-bottomed flask successively in step (1), stir and react at room temperature for 48h, and separate the pale white viscous oil obtained Wash several times with ethyl acetate and anhydrous ether, and remove the washing solvent by rotary evaporation to obtain a white powder, which is then ...
Embodiment 2
[0031] The dication imidazolium salt obtained in Example 1 is mixed with styrene, acrylonitrile (the mass ratio of dication imidazolium salt, styrene, and acrylonitrile is 6:1:3), DVB, and benzoin ethyl ether are blended into a reaction system, wherein , DVB accounts for 4% of the total mass of the reaction system, and benzoin ethyl ether accounts for 1% of the total mass of the reaction system. After mixing fully (but the dication imidazolium salt is not completely dissolved), evenly stirred and reacted at 70 ° C for 10 minutes to form a viscous liquid. and poured it into a glass mold. After cooling down to normal temperature, it was found that the previous double cationic imidazolium salt was not precipitated, and then 250nm ultraviolet light was used to irradiate and polymerize to form a film for 30 minutes to obtain Br - Type anion exchange membrane, then immersed in 1M KOH solution at 60°C for 36h for anion exchange (Br - Convert to OH - ), and finally soaked in deionize...
Embodiment 3
[0034] Add 30ml of ethanol as a solvent in a round bottom flask, then add 1-butylimidazole (2.0g, 16.10mmol) and 1,4-dibromobutane (16.10mmol) in turn, and stir the reaction slightly at room temperature for 12h, then use The purification method of Example 1 was purified, then 1-vinylimidazole (1.819g, 19.33mmol) was added and stirred at room temperature for 24h, and the corresponding purification method of Example 1 was used to purify to obtain the dication imidazolium salt;
[0035] The dicationic imidazolium salt prepared in this example is mixed with styrene, acrylonitrile (the mass ratio of the dicationic imidazolium salt, styrene, and acrylonitrile is 6:1:3), DVB, and benzoin ether to form a reaction system, wherein, DVB accounts for 4% of the total mass of the reaction system, and benzoin ethyl ether accounts for 1% of the total mass of the reaction system. The film-making method of Example 2 makes OH - type anion exchange membrane.
[0036] OH obtained in this example ...
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