The development of strategies for producing well-defined chiral porous membranes for the rapid and efficient enantioseparation of racemic mixtures remains a great challenge. Herein, we introduced an innovative, simple and easily scalable synthetic strategy to manufacture chiral porous polymer membranes (CPPMs) bearing chiral NH groups by crosslinking single-component chiral poly(ionic liquid)s (PILs) with water molecules via hydrogen (H)-bonding. The chiral evolution process from ionic liquid monomers to PILs to chiral porous membrane was well-demonstrated by a suite of experimental results from single crystals structural analysis, 1 H-NMR spectra, circular dichroism spectrum and in-situ scanning confocal microscopy. We demonstrated that these CPPMs are capable of efficient enantioseparation of drug enantiomers via directional H-bonding interactions and created a novel chiral membrane separation system.
Tremendous efforts have been devoted to exploiting synthetic wet adhesives for real-life applications. However, developing low-cost, robust, and multifunctional wet adhesive materials remains a considerable challenge. Herein, a wet adhesive composed of a single-component poly(ionic liquid) (PIL) that enables fast and robust underwater adhesion is reported. The PIL adhesive film possesses excellent stretchability and flexibility, enabling its anchoring on target substrates regardless of deformation and water scouring. Surface force measurements show the PIL can achieve a maximum adhesion of 56.7 mN·m–1 on diverse substrates (both hydrophilic and hydrophobic substrates) in aqueous media, within ∼30 s after being applied. The adhesion mechanisms of the PIL were revealed via the force measurements, and its robust wet adhesive capacity was ascribed to the synergy of different non-covalent interactions, such as of hydrogen bonding, cation−π, electrostatic, and van der Waals interactions. Surprisingly, this PIL adhesive film exhibited impressive underwater sound absorption capacity. The absorption coefficient of a 0.7 mm-thick PIL film to 4–30 kHz sound waves could be as high as 0.80–0.92. This work reports a multifunctional PIL wet adhesive that has promising applications in many areas and provides deep insights into interfacial interaction mechanisms underlying the wet adhesion capability of PILs.
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