Solvent‐Free Fabrication of Hard yet Flexible Transparent Coating with Liquid‐Like Lubrication through Surface Segregation and Topology Control

Abstract Developing a hard yet flexible transparent coating with liquid‐like lubrication is significant but still challenging. Herein, a liquid‐like lubricating coating is engineered through the surface segregation of polydimethylsiloxane (PDMS) and the regulation of network topology. Through the pre‐grafting of PDMS onto epoxy precursor, a well‐controlled microphase separation structure accompanied by surface‐segregated PDMS brushes is constructed, spontaneously leading to a uniform liquid‐like lubricating coating. By simply adjusting the ratio of symmetrical tetra‐armed precursor AG80 and linear bi‐functional precursor E44, the topological regularity of the coating network can be flexibly regulated to achieve hard yet flexible properties. The surface‐segregated PDMS brushes can not only endow the coating with durable interfacial lubrication but also effectively retain the inherent optical transparency and dye compatibility of the epoxy matrix. Furthermore, the developed facile and solvent‐free fabrication strategy exhibits superior constructability, universal applicability, and ecological friendliness. The reported coating system demonstrates broad and promising applications, including anti‐fouling, photovoltaic protection, anti‐counterfeiting, anti‐corrosion, and foldable displays, among others.