Preparation method of BPPO and PVA-based organic-inorganic hybrid anion exchange membrane
An anion-exchange membrane and hybrid technology, which is applied in the field of preparation of organic-inorganic hybrid anion-exchange membranes based on BPPO and PVA, can solve problems such as insufficient stability, insufficient cross-linking degree in the membrane, and strong hydrophilicity of PVA. , to achieve the effect of proper hydrophilicity, good flexibility and complete quaternization
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Embodiment 1
[0022] Embodiment 1, preparation of hybrid anion exchange membrane based on low PVA content, comprising the following steps:
[0023] (1) BPPO(+) / SiO 2 Preparation of materials: take 6 g of BPPO with a degree of bromination of 53.1%, dissolve it in chlorobenzene to form a solution with a concentration of 0.25 g / mL, and then add DMF to form a diluent with a concentration of 0.10 g / mL; add dropwise to the diluent 16 mL of trimethylamine / ethanol solution with a concentration of 0.2 g / mL was added dropwise for 0.5 h; the reaction was continued for 6 h at a temperature of 65 oC and under stirring conditions, and 0.78 g of tetraethoxysilane (TEOS), 0.90g of phenyltriethoxysilane (EPh) and 1.44g of water, continue to stir and react at a temperature of 65 oC for 12h, and coat the obtained sol-gel solution on a polytetrafluoroethylene plate, under a ventilated room temperature environment After drying for 1 day, 7.4 g of viscoelastic BPPO(+) / SiO was obtained 2 ;
[0024] (2) BPPO(+)...
Embodiment 2
[0042] Embodiment 2, the method for preparing the hybrid anion exchange membrane based on high PVA content, comprises the following steps:
[0043] (1) BPPO(+) / SiO 2 Material preparation: take 6 g of BPPO with a degree of bromination of 53.1%, dissolve it in chlorobenzene to form a solution with a concentration of 0.2 g / mL, and then add DMF to form a diluent with a concentration of 0.075 g / mL. 10 mL of trimethylamine / ethanol solution with a concentration of 0.3 g / mL was added dropwise to the diluent for 1 h, and the reaction was carried out at a temperature of 25 oC and stirring for 16 h, and then 1.17 g of tetraethoxysilane, 1.17 g of tetraethoxysilane, 1.17g of methyltriethoxysilane and 2.88g of water, continue to stir and react for 24h at a temperature of 25 oC, coat the obtained sol-gel solution on a plastic film, and dry it in a ventilated room temperature environment for 3 days to obtain 7.8 g dried BPPO(+) / SiO 2 ;
[0044] (2) BPPO(+) / SiO 2 Configuration of solution...
Embodiment 3
[0054] Embodiment 3, the method for preparing the hybrid anion exchange membrane based on low molecular weight alkoxysilane content, comprises the following steps:
[0055] (1) BPPO(+) / SiO 2 Material preparation: Take 6 g of BPPO with a bromination degree of 56.0%, dissolve it in chlorobenzene to form a solution with a concentration of 0.30 g / mL, and then add DMF to form a diluent with a concentration of 0.12 g / mL. Triethylamine / ethanol solution with a concentration of 0.2 g / mL and a volume of 20 mL was added dropwise to the diluent for 2 h, and the reaction was stirred at a temperature of 40 oC for 10 h, and then 0.34 g of tetramethoxyl was added to the solution. Silane (TMOS), 0.56g γ-methacryloyloxypropyltrimethoxysilane (KH-570) and 0.9g water, continue to stir and react for 16h at a temperature of 40 oC, and coat the obtained sol-gel solution with Covered on a polyvinyl chloride board and dried in a ventilated natural environment for 2 days to obtain 8.0g of dry BPPO(+) / ...
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