Nonionic hydrophilic side-chain polybenzimidazole membrane and preparation method thereof

A polybenzimidazole membrane, non-ionic technology, applied in the field of ion exchange membranes, can solve the problems of increasing the complexity of the membrane preparation process, achieve good chemical stability, good comprehensive performance, and improve the effect of proton conductivity

Inactive Publication Date: 2018-02-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the introduction of porous structures increases the complexity of the membrane preparation process and requires precise control of the repeatability of the membrane morphology.
However, for dense PBI membranes, their proton conductivity and energy efficiency, especially at high current densities, are still much lower than their corresponding porous membranes.

Method used

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  • Nonionic hydrophilic side-chain polybenzimidazole membrane and preparation method thereof
  • Nonionic hydrophilic side-chain polybenzimidazole membrane and preparation method thereof
  • Nonionic hydrophilic side-chain polybenzimidazole membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 1 g of PBI powder and 33 g of dimethyl sulfoxide into a dry 100 ml three-necked flask, and heat to dissolve at 80°C. After the dissolution is completed, the temperature is raised to 100°C. Because the deprotonation and nucleophilic substitution reaction of polybenzimidazole is carried out at a high temperature of 100°C, an oil bath is used for heat preservation, and a serpentine condensation reflux device is installed on the reaction three-necked flask. Condensate and reflux in an ice-water bath. Under nitrogen protection, 345.5 mg of potassium carbonate powder was added, and the reaction was stirred for 2 hours. 686.4 mg of 1-bromo-2-(2-methoxyethoxy)ethane was mixed with 3 g of dimethyl sulfoxide, slowly dropped into the reaction solution, and stirred for 20 hours. After the reaction, the reaction device was cooled in the air. After the reaction solution was cooled to room temperature, it was slowly poured into dilute sulfuric acid with a concentration of about 0...

Embodiment 2

[0030] Add 27g of dimethyl sulfoxide into a dry 100ml three-neck flask, add 1g of PBI powder under stirring, heat and dissolve at 80°C to form a yellow transparent solution. After the dissolution is completed, the temperature is raised to 100° C., and an oil bath is used for heat preservation. A serpentine condenser is installed on the reaction three-necked flask, and ice water is used to condense and reflux. Nitrogen was purged in the reaction system, 691.0 mg of potassium carbonate powder was added, and the reaction was stirred for 2 hours. Then, 1.373 g of small hydrophilic molecules for grafting and 3 g of dimethyl sulfoxide were uniformly mixed, slowly dropped into the reaction solution, and the stirring reaction was continued for 20 hours. After the reaction, the three-neck flask was cooled in the air and kept under nitrogen purging. After the reaction liquid was cooled to room temperature, it was slowly poured into dilute sulfuric acid with a concentration of about 0.6 ...

Embodiment 3

[0034]Take a dry and clean 100ml three-neck flask, add 1g of PBI powder and 24g of dimethyl sulfoxide, stir and heat at 80°C to dissolve, forming a uniform and transparent yellow solution. Then the temperature was raised to 100° C., and an oil bath was used for heat preservation, and a serpentine condensing reflux device was installed on the reaction three-necked flask, and ice water was used for condensing and refluxing. In order to prevent the deprotonated PBI from being oxidized by oxygen in the air, the whole reaction was carried out under the protection of nitrogen. 1.036g of potassium carbonate powder was added, and the reaction was stirred for 2 hours. Mix 1.373g of small hydrophilic molecules for grafting with 4g of dimethyl sulfoxide, slowly drop them into the reaction solution, and continue to stir and react for 30 hours. After the reaction, the reaction device was cooled in the air. After the reaction solution was cooled to room temperature, it was slowly poured in...

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Abstract

The invention belongs to the technical field of ion exchange membranes, and relates to a nonionic hydrophilic side-chain polybenzimidazole (PBI) membrane and a preparation method thereof. The method is completed by the steps of deprotonation of PBI, nucleophilic substitution, membrane formation, acid absorption and the like. The nonionic hydrophilic side chain induces the formation of a microscopic phase separation structure and hydrophilic nano channels in the membrane; and as an effective proton transfer path, the hydrophilic nano channels obviously enhance the proton conductivity of the membrane. Meanwhile, due to the moderate pore size of the hydrophilic nano channels and the Donnan effect of the protonated PBI, the vanadium ion permeability of the membrane is low. In addition, no ion-exchange group is introduced, so the grafted PBI membrane maintains favorable chemical stability of the original PBI membrane in an all-vanadium redox flow battery. The nonionic hydrophilic side-chainPBI membrane has favorable comprehensive properties, i.e., has superhigh proton conductivity, high ion permselectivity and favorable chemical stability.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, and relates to a nonionic hydrophilic side chain polybenzimidazole membrane and a preparation method thereof. Background technique [0002] Vanadium flow battery (VFB) is a promising large-scale electric energy storage device, which has the advantages of good safety, high efficiency, easy scale-up, and long life. Among them, the ion exchange membrane is one of its core components. However, the high cost of commercial perfluorosulfonic acid membranes (such as Nafion membranes) and the serious cross-contamination of vanadium ions have become the key constraints for the large-scale commercialization of VFBs. As for the non-fluorine ion-exchange membrane as an alternative, the introduction of ion-exchange groups accelerates its chemical degradation in VFB. Porous membranes use the principle of pore size sieving to selectively permeate hydrogen ions and block vanadium ions without int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/04C08J5/22C08G73/18H01M4/94
CPCC08G73/18C08J5/2256C08J5/2287C08J2379/04H01M4/94Y02E60/50
Inventor 焉晓明贺高红彭桑珊高莉张代双吴雪梅阮雪华
Owner DALIAN UNIV OF TECH
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