Composite anion exchange membrane of polyacrylonitrile and ionic liquid for fuel cell and preparation method thereof
A composite anion and polyacrylonitrile technology, which is applied in the fields of polymer chemistry and fuel cells, and can solve problems affecting membrane performance and life
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[0035] The present invention also provides a preparation method of polyacrylonitrile and ionic liquid composite anion exchange membrane for fuel cells, the method comprising:
[0036] Step 1: dissolving polyacrylonitrile in an organic solvent to obtain a homogeneous solution; the organic solvent is preferably N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF ) or dimethylsulfoxide (DMSO); the concentration of the homogeneous solution is preferably 7-10wt%; the dissolution temperature is preferably 55-70°C, and the dissolution time is preferably 2-3h;
[0037] Step 2: Add ionic liquid iodide-1-vinyl-3-methylimidazole into the solution obtained in Step 1, stir until dissolved, and pass nitrogen gas for 15-30 minutes, then add an initiator to react to obtain a reaction solution; Described initiator is preferably azobisisobutyrocyanide (AIBN), and the add-on of initiator is preferably 1% of ionic liquid quality; Described reaction temperature is preferably 55-70 ℃, and reac...
Embodiment 1
[0049] First, 4g of PAN powder and 50g of organic solvent DMAc were added to a three-necked flask, stirred at 70°C for 2-3 hours until completely dissolved to form a homogeneous solution (concentration of 8%), and then 1.6g of iodide was added to the PAN solution For 1-vinyl-3-methylimidazolium ionic liquid, pass nitrogen for 20 minutes to remove oxygen, condense and reflux, then add 0.016g AIBN to initiate the reaction at 70°C, the reaction stops after 8 hours, and the obtained solution is cast on a clean and dry glass plate into The film was quickly placed in a vacuum oven, dried at 60°C for 12 hours, and the film was peeled off from the glass plate. Finally, the film was soaked in 1M KOH solution at 60°C for about 24 hours, and repeated 3 times to ensure that I - completely by OH - Replace, rinse with deionized water until neutral, and set aside.
[0050] The prepared films were named PAN-[PVMIm][I] 0.4 and PAN-[PVMIm][OH] 0.4 .
Embodiment 2
[0052] First, 4g of PAN powder was dissolved in 50g of organic solvent DMAc, stirred at 70°C for 2 hours until completely dissolved to form a homogeneous solution (concentration of 8%), and then 2.4g of iodide 1-vinyl- For 3-methylimidazolium ionic liquid, pass nitrogen gas for 20 minutes to remove oxygen, condense and reflux, then add 0.024g AIBN to initiate the reaction at 70°C, the reaction stops after 8 hours, cast the obtained solution on a clean and dry glass plate to form a film, and place it quickly on In a vacuum oven, dry at 60°C for 12 hours, peel off the film from the glass plate, and finally soak the film in 1M KOH solution at 60°C for about 24h, repeat 3 times to ensure that I - completely by OH - Replace, rinse with deionized water until neutral, and set aside. The prepared films were named PAN-[PVMIm][I] 0.6 and PAN-[PVMIm][OH] 0.6 .
[0053] Figure 4 It is the TGA curve of the polyacrylonitrile and ionic liquid composite anion exchange membrane prepared ...
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