Preparation method of polybenzimidazole-structure-similar two-dimensional covalent organic framework

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

Active Publication Date: 2019-04-09
SHANXI UNIV
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  • 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 ra...

Method used

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  • Preparation method of polybenzimidazole-structure-similar two-dimensional covalent organic framework
  • Preparation method of polybenzimidazole-structure-similar two-dimensional covalent organic framework
  • Preparation method of polybenzimidazole-structure-similar two-dimensional covalent organic framework

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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

The invention relates to a preparation method of a polybenzimidazole-structure-similar two-dimensional covalent organic framework, belonging to the technical field of the preparation of covalent organic frameworks. The invention aims at providing the preparation method of the two-dimensional covalent organic framework which is taken as a novel phosphoric acid PBI system. The preparation method comprises the steps of adding 2,5-diamino-3,4-dimethylbenzimidazole and trialdehyde triphenol into an ampoule bottle in a molar ratio of 3 to 2, adding a solvent and a catalyst into the ampoule bottle, carrying out liquid nitrogen freezing degassing-unfreezing-freezing degassing for three cycles, sealing a pipe by virtue of a flame gun, putting the ampoule bottle into a 120-DEG C drying oven, reacting for 3-5 days, opening the pipe, filtering and collecting solid products in the pipe, carrying out Soxhlet extraction on the solid product through tetrahydrofuran, and carrying out vacuum drying at the room temperature, so as to obtain the polybenzimidazole-structure-similar two-dimensional covalent organic framework. The two-dimensional covalent organic framework prepared by virtue of the preparation method has a good microcellular 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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IPC IPC(8): C08G73/18
CPCC08G73/18
Inventor 李娟武珍珍张献明
Owner SHANXI UNIV
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