A method for preparing polybenzimidazole-based porous polymer ion-exchange membranes by gas-phase induced phase inversion method and its application

A porous polymer, ion exchange membrane technology, applied in the direction of diaphragms, organic diaphragms, electrolytic components, etc., to achieve the effects of easy mass production, simple preparation method, good thermal stability and mechanical properties

Active Publication Date: 2022-02-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes it possible to design batteries with electrode spacing less than 100 mm, that is, gas diffusion electrodes directly in contact with the membrane (J.Hydrogen Energy., 2011, 36, 15089), so anion exchange membranes based on quaternary ammonium salt functionalized polymers have recently received a lot of attention. Much attention has been paid, but improving polymer backbone structures for improved long-term stability as well as anion-exchange moieties in the hydroxide ionomer form remains a formidable challenge

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  • A method for preparing polybenzimidazole-based porous polymer ion-exchange membranes by gas-phase induced phase inversion method and its application
  • A method for preparing polybenzimidazole-based porous polymer ion-exchange membranes by gas-phase induced phase inversion method and its application
  • A method for preparing polybenzimidazole-based porous polymer ion-exchange membranes by gas-phase induced phase inversion method and its application

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Embodiment 1

[0038] Such as figure 1 with figure 2 Shown a kind of adopting gas-phase induced phase inversion method to prepare the method for the porous polymer ion-exchange membrane based on polybenzimidazole, comprises the following steps:

[0039] 1. Preparation of uniform film-forming solution

[0040] This step is specifically: dissolving polybenzimidazole (mPBI) in DMAc at room temperature, stirring for 1 hour, and preparing a 12.5 wt% uniform and transparent casting solution;

[0041] 2. Preparation of Porous Polybenzimidazole Polymer Electrolyte Separator by Gas Phase Inversion Method

[0042] This step is specifically as follows: a uniform solution of mPBI with a concentration of 12.5wt% is spread on a glass plate to form a solution film with an average thickness of 40±10 μm, and then the glass plate with the liquid film is quickly placed at 80 °C and the humidity is 60 °C. % air environment for 20min. Then take out the glass plate and immerse it in 3 liters of deionized wat...

Embodiment 2

[0049] A method for preparing a polybenzimidazole-based porous polymer ion-exchange membrane using a gas-phase induced phase inversion method, comprising the following steps:

[0050] 1. Preparation of uniform film-forming solution

[0051] This step is specifically: dissolving polybenzimidazole (mPBI) in DMAc at room temperature, stirring for 1 hour, and preparing a 12.5 wt% uniform and transparent casting solution;

[0052] 2. Preparation of Porous Polybenzimidazole Polymer Electrolyte Separator by Gas Phase Inversion Method

[0053] This step is specifically as follows: spread the uniform solution of mPBI with a concentration of 12.5wt% on a glass plate to form a solution film with an average thickness of 40 ± 10 μm, and then quickly place the glass plate with the liquid film at 80 ° C and a humidity of 70 % air environment for 20min. Then take out the glass plate and immerse it in 3 liters of deionized water at room temperature for 30 minutes, wash the porous membrane an...

Embodiment 3

[0056] A method for preparing a polybenzimidazole-based porous polymer ion-exchange membrane using a gas-phase induced phase inversion method, comprising the following steps:

[0057] 1. Preparation of uniform film-forming solution

[0058] This step is specifically: dissolving polybenzimidazole (mPBI) in DMAc at room temperature, stirring for 1 hour, and preparing a 12.5 wt% uniform and transparent casting solution;

[0059] 2. Preparation of Porous Polybenzimidazole Polymer Electrolyte Separator by Gas Phase Inversion Method

[0060] This step is specifically as follows: a uniform solution of mPBI with a concentration of 12.5wt% is spread on a glass plate to form a solution film with an average thickness of 40 ± 10 μm, and then the glass plate with the liquid film is quickly placed at 80 ° C and the humidity is 80 % air environment for 20min. Then take out the glass plate and immerse it in 3 liters of deionized water at room temperature for 30 minutes, wash the porous memb...

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Abstract

The invention discloses a method for preparing a polybenzimidazole-based porous polymer ion-exchange membrane by a gas phase-induced phase inversion method and its application. The porous membrane is made of a kind of organic high molecular polymer with benzimidazole or a variety of raw materials, prepared by the gas-phase induced phase inversion method, wherein the gas phase is a poor solvent vapor atmosphere of polybenzimidazole organic polymer. This kind of porous membrane can realize the transfer of ion exchange without ion exchange groups. A porous membrane with controllable pore structure, low cost and easy industrialization can be prepared by using the gas-phase induced phase inversion method. The porous film prepared by the invention is applied to the alkaline water electrolyzer after alkali doping, exhibits high ion conductivity and stable mechanical properties, and has a very good application prospect in the alkaline water electrolyzer.

Description

technical field [0001] The invention belongs to the technical field of alkaline water electrolyzers, and in particular relates to a method for preparing a polybenzimidazole-based porous polymer ion exchange membrane by a gas-phase induced phase inversion method and an application thereof. Background technique [0002] At present, electrochemical energy storage technology (that is, the storage of renewable energy surplus electricity in the form of hydrogen by splitting water electrochemically) has received more and more attention (IEEE, 2012, 100, 410). Proton exchange membrane (PEM) systems based on perfluorosulfonic acid membranes can produce high-purity hydrogen at high current densities, but are limited by electrode materials and catalysts in acidic environments, which hinders their large-scale application, making People began to turn to the traditional alkaline water electrolyzer technology. Under alkaline conditions, the relatively easy oxidation-reduction reaction prom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C25B13/02C25B13/08C25B1/04C25B9/19C08L79/04
CPCC08J5/2256C25B13/02C25B13/08C08J2379/04Y02E60/36
Inventor 李南文胡旭黄瑛达
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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