Bionic Self-Healing Aqueous Lubrication Based on Interfacial Supramolecular Host-guest Interaction

In this study, the adamantyl poly 3-sulfopropyl methacrylate potassium was successfully assembled onto the surface of cyclodextrin through the supramolecular host-guest recognition. The micro-topography, chemical composition, thickness and wettability of surface were detected to confirm the successful recognition and assembly. The frictional experiment of hydrophilic supramolecular substrate was implemented by reciprocating friction testing machine. The friction results showed an ultralow friction coefficient after assembling hydrophilic polymer ended with guest molecule under low load condition, but the friction coefficient became high under high load condition because the hydrophilic polymer may be sheared off from the supramolecular interface. More importantly, the surface not only owned ultralow friction coefficient but showed recoverability when friction failed under high load because of the non-covalent interaction between the guest and host groups.