New Advances in Covalent Network Polymers via Dynamic Covalent Chemistry
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Covalent organic frameworks (COFs) are an emerging class of crystalline porous polymers with highly tuneable structures and functionalities. COFs have been proposed as ideal materials for applications in the energy-intensive field of molecular separation due to their notable intrinsic features such as low density, exceptional stability, high surface area, and readily adjustable pore size and chemical environment. This review attempts to highlight the key advancements made in the synthesis of COFs for diverse separation applications such as water treatment or the separation of gas mixtures and organic molecules, including chiral and isomeric compounds. Methods proposed for the fabrication of COF-based columns and continuous membranes for practical applications are also discussed in detail. Finally, a perspective regarding the remaining challenges and future directions for COF research in the field of separation has also been presented.more » « less
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This Backstory presents the author’s perspective on the discovery of covalent dendrimers. Between 1979 and 1985, four laboratories across academia and industry reported the first syntheses of branched and monodisperse-protein-like covalent macromolecules, prepared from synthetic and biological building blocks. These branched molecules and macromolecules were described under four different names, which were initially debated but ultimately accepted by the scientific community. The advent of dendrimers established a new research field that is now supported by two biannual international symposia.more » « less
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