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Preparation method of a two-dimensional covalent organic framework with polybenzimidazole-like structure

A technology of covalent organic framework and polybenzimidazole, which is applied in the field of preparation of covalent organic framework, can solve the problems of too fast reaction rate, disordered pores, small pore size, etc., and achieve the effect of improving ion conduction rate

Active Publication Date: 2022-01-28
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polymerization of o-phenylenediamine monomers and aldehyde substituents can prepare porous structure PBI, but the reaction rate is too fast, resulting in disordered pores and small pore size, which cannot accommodate a sufficient amount of proton carriers.

Method used

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  • Preparation method of a two-dimensional covalent organic framework with polybenzimidazole-like structure
  • Preparation method of a two-dimensional covalent organic framework with polybenzimidazole-like structure
  • Preparation method of a two-dimensional covalent organic framework with polybenzimidazole-like structure

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Experimental program
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Effect test

Embodiment 1

[0022] Add 23mg of monomer 2,5-diamino-3,4-dimethylbenzimidazole and 19mg of monomer trialdehyde triphenol into a 10ml ampoule, then add 0.5ml of trimethylbenzene, 0.5ml of 1 , 4-dioxane and 0.1ml of 6M aqueous acetic acid solution. After three cycles of liquid nitrogen freeze-degassing-thawing-freeze-degassing, the tube was sealed with a flame gun. The ampoule was placed in an oven at 120°C for 5 days. The tube was opened and the solid product in the tube was collected by filtration. The solid product was Soxhlet extracted with THF for 48 hours. Then carry out vacuum drying at room temperature to obtain the final product DAB-Tp. The yield is 80%.

[0023] From figure 2 It can be seen that the characteristic peaks of the two reactive monomers disappear, and the generated C=C double bond and C-N single bond prove that the bridging unit has been formed.

[0024] From image 3 It can be seen that the covalent structure of DAB-Tp has been formed.

[0025] From Figure 4 ...

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Abstract

A method for preparing a two-dimensional covalent organic framework with a polybenzimidazole-like structure belongs to the technical field of preparation of covalent organic frameworks. The purpose of the present invention is to provide a method for preparing a two-dimensional covalent organic framework material as a novel Phosphate PBI system. Put 2,5-diamino-3,4-dimethylbenzimidazole and trialdehyde triphenol into the ampoule in a molar ratio of 3:2, add solvent and catalyst to the ampoule and freeze with liquid nitrogen After three cycles of degassing-thawing-freezing and degassing, seal the tube with a flame gun, place the ampoule in an oven at 120°C for 3~5 days, open the tube, filter and collect the solid product in the tube, and treat the solid product with tetrahydrofuran Soxhlet extraction was performed for 1-2 days, and then vacuum-dried at room temperature to obtain a two-dimensional covalent organic framework with a polybenzimidazole-like structure. The two-dimensional covalent organic framework prepared by the preparation method of the invention has a good microporous structure.

Description

technical field [0001] The invention belongs to the technical field of preparation of covalent organic frameworks, and in particular relates to a preparation method of a two-dimensional covalent organic framework with a polybenzimidazole-like structure. Background technique [0002] The performance of the proton membrane (PEM) plays a crucial role in the operating rate of proton membrane fuel cells (PEMFCs). The Nafion-type PEM produced by Dupont is highly dependent on water and has a low operating temperature. Therefore, it is impossible to avoid the catalytic toxicity of CO in the carrier gas to Pt, and it also causes low hydrogen supply efficiency. Medium and high temperature PEMFCs can not only overcome the adverse effects of low temperature, but also use high temperature to improve the reaction rate and proton conductivity of the battery and simplify the hydrothermal management system of the battery. The development of proton conductors with medium-high temperature and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/18
CPCC08G73/18
Inventor 李娟武珍珍张献明
Owner SHANXI UNIV
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