Multifunctional Underwater Adhesive Film Enabled by a Single-Component Poly(ionic liquid)

Abstract

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.

Triple-Bioinspired Shape Memory Microcavities with Strong and Switchable Adhesion

“…Surfaces stored at room temperature and even at −18 °C for 45 days can maintain adhesion strengths comparable to that of the as-prepared surfaces (Figure S20). In addition to normal adhesion, shear adhesion is also often used to characterize surface adhesion to solids, , and shear adhesion strength between our H-SMPM surface and solid substrates follows a similar trend of change as normal adhesion (Figure S21). Moreover, the surface can also be used in complex conditions; for example, in water, the H-SMPM surface exhibits an underwater adhesion on a flat glass of about 27 kPa (Figure S22).…”

A Lithium‐Salt‐Free, Hydrophobic, Solid‐State Poly(Ionic Liquid) Electrolyte Enables Rapid Assembly of Unencapsulated, Removable Electrochromic “Window Tint Film”

“…The P(IL-MEA) electrolyte acts as a novel adhesive due to synergistic interfacial interactions such as dipole-dipole, electrostatic, and ion-dipole interactions. [22,38] In the lap shear test, the adhesion strength of indium tin oxide on polyethylene terephthalate (ITO-PET) substrates with P(IL-MEA)−60 electrolytes were found to be 383 ± 55 kPa (Figure 2e). Strong adhesion between an electrolyte and electrode greatly expands the type of applicable substrate material, including ITO glass, ITO-PET, textile, and steel (Figure S4a, Supporting Information).…”

Facile and Eco-Friendly Approach to Multifunctional Supramolecular Poly(ionic liquid) Nanoporous Membranes Containing Hydrophilic Anions (Br–, MBry–, M = Sn, Pb, Sb, Bi)

“…The size and quantity of the membranes are easily controlled by the amount of PIL added and the substrate size. It is noteworthy that synthesizing PILs with hydrophilic anions to prepare SPPMs is innovative and straightforward, which avoids expensive ion metathesis reactions to yield PILs with hydrophobic anions (i.e., bis­(trifluoromethanesulfonyl)­imide, TFSI) for traditional syntheses of SPPMs. ,,,,,− The facile, eco-friendly, and readily scalable syntheses of these novel SPPMs have also enabled opportunities to investigate the chemistry of halogen anions that have never been studied in PPMs before.…”