“Ionic Ocean” Constructed Super Underwater Adhesive, Stretchable, Self‐Healing Hydrophobic Conductive Ionogel

Abstract With the advancement of technology, the exploration of underwater environment has received widespread attention in recent years. However, achieving excellent overall performance underwater remains a challenge due to the vast differences between aquatic and terrestrial environments. The ionogel composed of ionic liquid and polymer with hydrophobic group has good hydrophobicity and can avoid the influence of water as much as possible. Here, for the first time an ionic ocean structure is reported that consists of polymer chains with the same ion groups as the ionic liquid. The ion groups in ionic ocean can rapidly repair and replenish the polymer chains during the stretching and healing process without the need for polymer chain movement or covalent bond reorganization, thus enabling ionogel to obtain super stretching and excellent self‐healing capabilities. Moreover, the ionogel shows excellent underwater adhesion properties. These excellent mechanical properties and reliable underwater performance demonstrate enormous potential in ocean exploration and protection.