Wei Wang

Protective polymer coatings for marine and island infrastructures are expected to integrate resistance to mechanical damage, chloride attack, ultraviolet aging and fungal colonization, yet achieving these functions in a single dynamic coating remains challenging. Herein, an Oct‐CUPU coating is developed by embedding a benzotriazole‐modified g‐C ₃ N ₄ /NH ₂ ‐UiO‐66 heterostructure, denoted as Oct‐CU, into a disulfide‐containing polyurea network. The g‐C ₃ N ₄ /NH ₂ ‐UiO‐66 heterointerface provides photothermal conversion and interfacial reinforcement; the benzotriazole moiety improves UV shielding, and the dynamic polyurea matrix supplies reversible hydrogen bonding and disulfide exchange for damage repair. These coupled molecular and interfacial interactions enable localized light‐to‐heat conversion to activate chain mobility and network reconstruction, while the rod‐like heterostructure promotes stress redistribution and improves long‐term barrier stability. As a result, the optimized Oct‐CUPU coating exhibits rapid NIR‐triggered scratch healing and markedly enhanced corrosion‐barrier retention. It also maintains improved abrasion tolerance, UV‐aging resistance, and mold resistance compared with the unmodified coatings. This work presents a heterostructure‐assisted design strategy for adaptive polyurea coatings with integrated self‐healing, anticorrosion, anti‐aging, and antifouling‐related functions, offering potential for durable protection of metallic structures in marine, coastal, and outdoor environments.

Marine equipment faces numerous threats during service, such as metal corrosion and the attachment of marine fouling organisms. Therefore, the development of multifunctional organic protective coatings is crucial. In this study, a UV-curable, photothermal-responsive PHFBA-IBOA/Bi2WO6@CuS (PFI/BC) polyacrylate organic composite coating was successfully synthesized and evaluated for its structure and properties. The composite coating exhibits a time-efficient preparation process, high photothermal self-healing efficiency, ultra-long anticorrosion capacity and outstanding antifouling ability. The results show that the temperature at the center of the PFI/BC composite coating reaches 133.1 °C upon exposure to the NIR laser at 808 nm of 1.5 W·cm-2. This constitutes a 225% increase relative to the pure resin. The self-healing of the PFI/BC composite coating can be completed after 45 seconds of irradiation. After 90 d of EIS test, the |Z|0.01Hz of the PFI/BC composite coating can reach 1.3×108 Ω·cm2, which proves its excellent anticorrosion performance. After 336 h of algae attachment experiment, the PFI/BC composite coating exhibited the lowest level of Platymonas subcordiformis and Phaeodactylum tricornutum adhesion, demonstrating long-term antifouling capability. This research provides a promising strategy for the development of multifunctional organic protective coatings.