Lewis-Acid-Catalyzed Interfacial Polymerization of Covalent Organic Framework Films
| Autor: | Amanda R. Corcos, Daniel C. Ralph, Halleh B. Balch, Gregory M. Stiehl, Lauren Valentino, William R. Dichtel, Michio Matsumoto, Benito J. Mariñas, Feng Wang |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science General Chemical Engineering Biochemistry (medical) 02 engineering and technology General Chemistry Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Interfacial polymerization 0104 chemical sciences Amorphous solid Membrane Chemical engineering Polymerization chemistry Covalent bond Materials Chemistry Environmental Chemistry Lewis acids and bases 0210 nano-technology Covalent organic framework |
| Zdroj: | Chem. 4:308-317 |
| ISSN: | 2451-9294 |
| Popis: | Summary Covalent organic frameworks (COFs) are crystalline polymers with covalent bonds in two or three dimensions, providing pores 1–5 nm in diameter. COFs are typically isolated as microcrystalline powders, which are unsuitable for many applications that would leverage their tunable structures, such as optoelectronic devices and nanofiltration membranes. Here, we report the interfacial polymerization of polyfunctional amine and aldehyde monomers with a Lewis acid catalyst, Sc(OTf) 3 . Immiscible solutions segregate the catalyst from the monomers, confining polymerization to the solution interface. This method provides large-area, continuous COF films (several cm 2 ) with a thickness tuned from 100 μm to 2.5 nm. Relatively thick films were crystalline, whereas the films that are a few nanometers thick were presumably amorphous. The COF films were transferred onto polyethersulfone supports, and the resulting membranes showed enhanced rejection of Rhodamine WT, a model water contaminant. The large area, tunable pore size, and tailored molecular composition show promise for nanofiltration applications. |
| Databáze: | OpenAIRE |
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