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A kind of preparation method of polybenzimidazole cross-linked film doped with phosphoric acid

A technology of polybenzimidazole and benzimidazole, which is applied in the field of proton exchange electrolyte membrane preparation, can solve problems such as unrealizable, high conductivity, and high activity of halogen functional groups, and achieve easy operation, high conductivity, and strong acid binding The effect of the ability

Active Publication Date: 2021-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the high activity of the halogen functional group, the high molecular polymer used as a crosslinking agent is often self-crosslinked, so that the preparation of a proton exchange electrolyte membrane with high conductivity and good mechanical properties cannot be achieved.

Method used

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  • A kind of preparation method of polybenzimidazole cross-linked film doped with phosphoric acid
  • A kind of preparation method of polybenzimidazole cross-linked film doped with phosphoric acid
  • A kind of preparation method of polybenzimidazole cross-linked film doped with phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 150g of polyphosphoric acid and 3.25g of biphenyltetramine into a 250ml three-necked flask, blow in nitrogen, stir mechanically, raise the temperature of the oil bath to 140°C, and keep it for 3h. After continuing to heat up to 200°C, add 2.51g of isophthalic acid and 5.0g of phosphorus pentoxide, and react for 24 hours. The obtained polymer product was slowly poured into an aqueous sodium hydroxide solution and soaked for 24 hours, filtered, dried, and ground into PBI powder.

Embodiment 2

[0029] Embodiment 2 (comparative example)

[0030] Weigh 17g of PBI solution (10wt%, solvent N-methylpyrrolidone), cast it on a horizontal base, and dry it to form a film. The prepared polybenzimidazole crosslinked membrane was boiled in deionized water for 12 hours to remove residual solvent. After drying at 120° C. for 2 hours, soaking in phosphoric acid at 80° C. with a mass concentration of 85% for 10 hours to obtain a phosphoric acid-doped polybenzimidazole electrolyte membrane.

Embodiment 3

[0032] Weigh 17g of PBI solution (10wt%, solvent N-methylpyrrolidone), add 250ul vinylimidazole, 39ul p-chloromethylstyrene, 23mg initiator (azobisisobutyronitrile) while stirring, and keep stirring for 15min. The prepared solution was cast on a horizontal base and dried to form a film. The prepared polybenzimidazole crosslinked membrane was boiled in deionized water for 12 hours to remove residual solvent. After drying at 120° C. for 2 hours, soaking in phosphoric acid at 80° C. with a mass concentration of 85% for 10 hours to obtain a phosphoric acid-doped polybenzimidazole cross-linked membrane.

[0033] Table 1. Embodiment 2, embodiment 3 make electrolyte membrane performance contrast

[0034]

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Abstract

The present invention relates to a preparation method of polybenzimidazole crosslinked film doped with phosphoric acid, comprising the following steps: (1) preparation of polybenzimidazole solution, 2) preparation of polybenzimidazole crosslinked film: taking the above polybenzimidazole Benzimidazole solution, in the process of stirring, add azacycloalkene and p-chloromethylstyrene to obtain a mixed solution; use the mixed solution to cast a film and dry to obtain a polybenzimidazole cross-linked film; (3) phosphoric acid doped Preparation of heteropolybenzimidazole electrolyte membrane: Soak the polybenzimidazole crosslinked membrane obtained in step (2) in phosphoric acid with a mass concentration of 85%-90%, to obtain a phosphoric acid-doped polybenzimidazole electrolyte membrane. According to the invention, small organic molecules and PBI are blended and casted to undergo reaction polymerization and cross-linking to form a film, so as to improve the mechanical properties of the phosphoric acid-doped PBI film.

Description

technical field [0001] The invention belongs to the field of polymer electrolyte exchange membranes, in particular to a preparation method of a proton exchange electrolyte membrane with relatively high electrical conductivity and good mechanical properties. Background technique [0002] The application of acid-doped polybenzimidazole (PBI) membranes in fuel cells has promoted the development of high-temperature proton exchange membrane fuel cells (PEMFC). The proton conductivity of the acid-doped PBI membrane depends on the acid content in the membrane, that is, the higher the phosphoric acid doping level of the membrane, the higher the conductivity of the membrane. However, a higher acid doping level will significantly reduce the mechanical strength of the membrane, which will directly affect the performance and service life of the fuel cell. It is a common and effective method to develop high-temperature cross-linked membranes with high acid doping levels and good mechani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1072
CPCH01M8/1072Y02E60/50Y02P70/50
Inventor 王素力闫树华马文佳孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI