Monocyclic ammonium ion polybenzimidazole, anion exchange membrane, preparation method of monocyclic ammonium ion polybenzimidazole, and application of monocyclic ammonium ion polybenzimidazole and anion exchange membrane
An anion exchange membrane and polybenzimidazole technology are applied in the field of preparation of monocyclic ammonium ion polybenzimidazole and anion exchange membranes, which can solve the problems of poor alkali resistance and stability, low ionic conductivity and the like, and achieve film formation. Good properties, high ionic conductivity, film toughness and high alkali resistance and stability
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Embodiment 1
[0061] Add polyphosphoric acid in a stirred reactor, under N 2 Under protection, add biphenyltetramine, succinic acid and biphenyldiacid (the molar number of biphenyltetramine is equal to the total molar number of succinic acid and biphenyldiacid), heat and stir to dissolve, so that the total concentration of monomer mass is 12 wt%. Raise the temperature to 110°C and stir for 3 hours, 140°C for 5 hours, then raise the temperature to 180°C for 8 hours until the viscosity of the system no longer increases. After the polymerization is completed, the product is poured into a large amount of deionized water, and excess NaHCO is added 3 , stirred overnight. Filter and wash the polymer with deionized water until neutral. The product is dried to obtain polybenzimidazole.
[0062] Slowly add 10 mmol of N-methylpyrrole into 15 mmol of dibromobutane in acetone, raise the temperature to 30° C. and stir for 14 h. After the reaction is completed, filter, and the filter cake is washed w...
Embodiment 2
[0067] The synthesis of polybenzimidazole is the same as in Example 1.
[0068] Slowly add 10 mmol of N-methylpyrrole into 30 mmol of dibromobutane in acetone, raise the temperature to 90° C. and stir for 10 h. After the reaction is completed, filter, and the filter cake is washed with acetone, filtered, and dried to obtain bromobutylpiperidinium ammonium.
[0069] 1 g of synthesized polybenzimidazole was heated and dissolved in NMP to form a 6 wt % solution, and 5 g of bromobutylpyrrole ammonium was added, and reacted at 50° C. for 20 h. After the reaction was completed, it was poured into deionized water, filtered, washed three times with deionized water, and the product was dried to obtain bromobutylpyrrole ammonium PBI.
[0070] Dissolve bromobutylpyrrole ammonium PBI in DMAc to prepare a 6wt% solution, vacuumize for 0.5h, filter, cast the filtrate on a clean flat plate to lay a film, and transfer it to a 60°C oven for drying. Immerse the prepared membrane in 1M NaOH sol...
Embodiment 3
[0073] Add polyphosphoric acid in a stirred reactor, under N 2 Under protection, add equimolar ratio of diphenyltetramine methane (A takes methylene-CH 2 -) and biphenyl diacid, heated and stirred to dissolve, so that the total concentration of the monomer mass is 15wt%. Raise the temperature to 120°C and stir for 0.5h, react at 150°C for 3h, then raise the temperature to 170°C for 6h, until the viscosity of the system no longer increases. After the polymerization is completed, the product is poured into a large amount of deionized water, and excess NaHCO is added 3 , stirred overnight. Filter and wash the polymer with deionized water until neutral. Dry to obtain polybenzimidazole.
[0074] Slowly add 10 mmol of N-methylpyrrole into 20 mmol of dibromoheptane in acetone, raise the temperature to 50° C. and stir for 30 h. After the reaction is completed, filter and wash the filter cake with acetone, filter and dry to obtain bromoheptylpyrrole ammonium.
[0075] 1g of synth...
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