A kind of high-strength chitosan-based anion exchange membrane and preparation method thereof
A technology of chitosan-based anion and ion exchange membranes, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of low conductivity of chitosan membranes, achieve simple preparation methods, improve mechanical properties, The effect of high mechanical strength
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Embodiment 1
[0024] Prepare high-strength chitosan-based anion-exchange membrane, the steps are as follows:
[0025] 1) at room temperature, 0.4g chitosan powder (weight average molecular weight is 50,000-70,000, deacetylation degree is more than 90%) is dissolved in the acetic acid aqueous solution that 15mL concentration is 2% (v / v), and fully Stir to make it fully dissolve to obtain chitosan solution;
[0026] 2) Dissolve 0.1g polydiene dimethyl ammonium chloride (weight average molecular weight: 400,000-500,000) aqueous solution in 5mL deionized water, slowly add it dropwise to the above-mentioned chitosan solution, and keep stirring for 12h to make it fully Mix to obtain a mixed solution, weigh 0.08g of γ-(2,3-glycidoxy)propyltrimethoxysilane and 0.04g of tetraethoxysilane dissolved in 5mL of deionized water to make a siloxane aqueous solution, and add it dropwise In the above mixed solution, the sol was obtained by continuously stirring and reacting at 60°C for 12 hours;
[0027] 3...
Embodiment 2
[0029] Prepare high-strength chitosan-based anion-exchange membrane, the steps are as follows:
[0030] 1) at room temperature, 0.4g chitosan powder was dissolved in 15mL concentration of 2% (v / v) acetic acid aqueous solution, and fully stirred to make it fully dissolved to obtain chitosan solution;
[0031] 2) Dissolve 0.2g polydiene dimethyl ammonium chloride aqueous solution in 5mL deionized water, slowly add it dropwise into chitosan solution, keep stirring for 12h, make it fully mixed to obtain a mixed solution, weigh 0.08gγ -(2,3-Glycidoxypropoxy)propyltrimethoxysilane and 0.04g tetraethoxysilane were dissolved in 5mL deionized water to form a siloxane aqueous solution, which was added dropwise to the mixture obtained above, 60 Continue stirring at ℃ for 12 hours to obtain a sol;
[0032] 3) Pour the sol into a polytetrafluoroethylene film tray, age at room temperature for 24 hours, then vacuum-dry at 60°C for 4 hours, then heat-treat at 100°C, 120°C, and 150°C for 2 ho...
Embodiment 3
[0034] Prepare high-strength chitosan-based anion-exchange membrane, the steps are as follows:
[0035] 1) at room temperature, 0.4g chitosan powder was dissolved in 15mL concentration of 2% (v / v) acetic acid aqueous solution, and fully stirred to make it fully dissolved to obtain chitosan solution;
[0036] 2) Dissolve 0.3g polydiene dimethyl ammonium chloride aqueous solution in 5mL deionized water, slowly add it dropwise into the chitosan solution, keep stirring for 12h, make it fully mixed to obtain a mixed solution, weigh 0.08gγ -(2,3-Glycidoxypropoxy)propyltrimethoxysilane and 0.04g tetraethoxysilane were dissolved in 5mL deionized water to form a siloxane aqueous solution, which was added dropwise to the mixture obtained above, 60 Continue stirring at ℃ for 12 hours to obtain a sol;
[0037] 3) Pour the sol into a polytetrafluoroethylene film tray, age at room temperature for 24 hours, then vacuum-dry at 60°C for 10 hours, then heat-treat at 100°C, 120°C, and 150°C for...
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