Chemical synthesis by design produces a vast number of complex membrane materials. Various approaches have been proposed to design self-assembled materials and supramolecular chemistry has played an important role in this exploration. Constitutional synthesis by selection provides an evolutional approach for the generation of adaptive materials. Most scenarios are related to the selection of the optimal structures from dynamic libraries. We show that the use of reversibly connected trialdehyde cores and diamine hydrophilic/hydrophobic connectors may generate libraries of dynameric frameworks of variable composition. The dynamic reversible imine- and trans-imination reactions induce the progressive segregation of library consisting homo- and hetero-dynameric frameworks, through the constitutional selection and successive precipitation of low soluble hydrophobic films and hydrophilic/hydrophobic HY/HP of dynamers, segregating solvents, and casting surfaces were correlated with the emerged membrane structure, and NMR/TEM-EDX characterizations mostly supported their hypothesis. Its application for directional water transport was further confirmed. At low pressure, water can only penetrate through HY side of the membrane and blocked from the HP side. Straightforward synthetic access to asymmetric membranes give rise to novel strategies to constitutionally built up under molecular control very productive transport membranes for high added value applications as water purification or protein purification.

Dynameric asymmetric membranes for directional water transport

2019 Fall National Meeting

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