Scalable Fabrication of Crystalline COF Membranes from Amorphous Polymeric Membranes

Covalent organic framework (COF) membranes hold potential for widespread applicability, but scalable fabrication is challenging. Here, we demonstrate the disorder‐to‐order transformation from amorphous polymeric membrane to crystalline COF membrane via monomer exchange. Solution processing is used t...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-08, Vol.60 (33), p.18051-18058
Main Authors: Fan, Chunyang, Wu, Hong, Guan, Jingyuan, You, Xinda, Yang, Chao, Wang, Xiaoyao, Cao, Li, Shi, Benbing, Peng, Quan, Kong, Yan, Wu, Yingzhen, Khan, Niaz Ali, Jiang, Zhongyi
Format: Article
Language:English
Subjects:
covalent organic frameworks
Crystal structure
Crystallinity
disorder-to-order
Fabrication
Genetic transformation
Hydrogen bonding
Hydrogen bonds
Materials processing
Membranes
Monomers
Morphology
proton transport
solution processability
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Summary:Covalent organic framework (COF) membranes hold potential for widespread applicability, but scalable fabrication is challenging. Here, we demonstrate the disorder‐to‐order transformation from amorphous polymeric membrane to crystalline COF membrane via monomer exchange. Solution processing is used to prepare amorphous membrane and the replacing monomer is selected based on the chemical and thermodynamical stability of the final framework. Reversible imine bonds allow the extraneous monomers to replace the pristine monomers within amorphous membrane, driving the transformation from disordered network to ordered framework. Incorporation of intramolecular hydrogen bonds enables the crystalline COF to imprint the amorphous membrane morphology. The COF membranes harvest proton conductivity up to 0.53 S cm−1 at 80 °C. Our strategy bridges amorphous polymeric and crystalline COF membranes for large‐scale fabrication of COF membranes and affords guidance on materials processing. A disorder‐to‐order transformation strategy is developed for the scalable fabrication of highly crystalline covalent organic framework (COF) membrane from amorphous polymeric membrane via monomer exchange.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202102965