Preparation method of BPPO and PVA-based organic-inorganic hybrid anion exchange membrane

An anion-exchange membrane and hybridization technology, which is applied in the field of preparation of organic-inorganic hybrid anion-exchange membranes based on BPPO and PVA, can solve the problems of strong hydrophilicity of PVA, insufficient stability, and insufficient cross-linking degree in the membrane. , to achieve the effect of good flexibility, appropriate hydrophilicity and complete quaternization

Inactive Publication Date: 2014-05-07
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hybrid anion exchange membrane prepared by this method has appropriate ion exchange capacity and high separation efficiency for acids, but due to the strong hydrophilicity of PVA, the degree of crosslinking in the membrane is insufficient, resulting in insufficient stability of the membrane in aqueous solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one, prepare the hybrid anion exchange membrane based on low PVA content, comprise the following steps:

[0023] (1) BPPO(+) / SiO 2 Preparation of materials: Take 6 g of BPPO with a bromination degree of 53.1%, dissolve it in chlorobenzene to form a solution with a concentration of 0.25 g / mL, then add DMF to form a dilution with a concentration of 0.10 g / mL; add dropwise to the dilution 16 mL of trimethylamine / ethanol solution with a concentration of 0.2 g / mL, the dropwise addition time was 0.5 h; the reaction was continued for 6 h at a temperature of 65 oC under stirring conditions, and then 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. After drying for 1 day, 7.4g of BPPO(+) / SiO in viscoelastic state was obtained 2 ;

[0024] (2) BPPO(+) / SiO 2 Solution configuration: 7.4g B...

Embodiment 2

[0042] Embodiment two, the method for preparing the hybrid anion exchange membrane based on high PVA content, comprises the following steps:

[0043] (1) BPPO(+) / SiO 2 Preparation of materials: Take 6 g of BPPO with a bromination degree 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 dilution solution with a concentration of 0.075 g / mL. Add 10 mL of trimethylamine / ethanol solution with a concentration of 0.3 g / mL dropwise to the diluent for 1 h, react at a temperature of 25 °C for 16 h under stirring conditions, then add 1.17 g of tetraethoxysilane, 1.17g of methyltriethoxysilane and 2.88g of water, continue stirring and reacting at a temperature of 25 o C for 24h, the obtained sol-gel solution is coated on a plastic film, and dried for 3 days in a ventilated room temperature environment to obtain 7.8 g dry BPPO(+) / SiO 2 ;

[0044] (2) BPPO(+) / SiO 2 Solution configuration: 7.8g BPPO(+) / SiO prepared in s...

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 Preparation of materials: 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 dilution solution with a concentration of 0.12 g / mL. Add dropwise a triethylamine / ethanol solution with a concentration of 0.2 g / mL and a volume of 20 mL to the diluent for 2 hours, stir and react at a temperature of 40 °C for 10 hours, and then add 0.34 g of tetramethoxy Silane (TMOS) and 0.56g γ-methacryloxypropyl trimethoxysilane (KH-570) and 0.9g water, continue to stir and react at a temperature of 40 oC for 16h, and coat the obtained sol-gel solution Cover it on a polyvinyl chloride plate and dry it for 2 days in a ventilated natural environment to obtain 8.0g of dry BPPO(+) / SiO 2 Material;

[0...

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Abstract

The invention discloses a preparation method of a BPPO (Brominated Polystyrene) and PVA (Polyvinyl Alcohol)-based organic-inorganic hybrid anion exchange membrane. The preparation method comprises the following steps: (1), dissolving the BPPO in chlorobenzene, and adding DMF (Dimethyl Formamide), tertiary amine solution, two micromolecule alkoxy silanes and water so as to obtain BPPO (+) / SiO2 materials; (2) dissolving the obtained BPPO (+) / SiO2 materials into DMF mixed solution so as to BPPO (+) / SiO2 solution; (3) dropping the BPPO (+) / SiO2 solution into PVA solution so as to prepare coating liquid; and (4) coating the coating liquid on a basal body so as to form a diaphragm, and drying the diaphragm to obtain the organic-inorganic hybrid anion exchange membrane. According to the invention, quaternary ammonium BPPO, PVA and micromolecule alkoxy silanes are utilized to prepare the hybrid anion exchange membrane containing the quaternary ammonium group and-OH base, the content of the PVA in the membrane can be controlled, and a cross-linked structure can be formed, so that the stability and mechanical performance of the membrane can be reinforced; and moreover, the -OH base in the PVA can promote the H+ ion to transfer, so that the prepared hybrid anion exchange membrane is particularly suitable for diffusion dialysis process, and can separate and recycle acid waste liquid.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a method for preparing an organic-inorganic hybrid anion exchange membrane based on benzyl brominated polyphenylene oxide (BPPO) and polyvinyl alcohol (PVA) by a blending method. Background technique [0002] Organic-inorganic hybrid anion exchange membranes contain anion exchange groups and have the function of selective permeability to ions, and are used in nanofiltration, fuel cells, diffusion dialysis and other fields. The preparation of existing hybrid anion exchange membranes is mainly to perform functionalization and sol-gel reaction on a single polymer, but there are always some shortcomings, such as: [0003] Chinese patent 200410065737.8 discloses a preparation method of an organic-inorganic hybrid anion exchange membrane, which uses the benzyl bromide group contained in BPPO, and a part of it is grafted with -NH 2 A part of the silane was subjected to qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/52B01D71/38B01D67/00C08J5/22C08L71/12C08L29/04C08K3/36
Inventor 吴永会张根成茆福林
Owner YANCHENG TEACHERS UNIV
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