Polybenzoxazine is an outstanding and highly promising resin for many advanced applications. This paper reports on a series of sustainable high-performance coatings made of benzoxazine monomer synthesized via the Mannich reaction of curcumin, 3-aminopropyltriethoxysilane and paraformaldehyde. This curcumin-based polybenzoxazine resin was experimentally demonstrated for the first time to be an effective barrier layer, which could evidently reduce the corrosion rate of the substrate metal, and significantly resist the fouling attachment. In addition, it was found that an increased content of PEG in the resin could further improve the antifouling performance of the coating. Molecular dynamics (MD) simulations suggested that a carefully selected density of PEG molecules in the polybenzoxazine framework could critically affect the hydration layer and the interaction energy. The benzoxazine monomer and polymer were characterized by Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), proton nuclear magnetic resonance (¹H NMR and ¹³C NMR) spectroscopy, different scanning calorimetry (DSC), and thermogravimetric technique. The anticorrosion and antifouling of the developed polybenzoxazine resins were evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and attachment of protein, bacteria and microalgae. The results showed that the polybenzoxazine coatings (PCB or PCBG-X) performed excellently in anticorrosion even after long-term exposure in corrosive environments, and some of the polybenzoxazine coatings, like PCBG-10 and PCBG-15, possessed a superior antifouling capacity. To simultaneously enhance the anticorrosion and antifouling, a double layer coating system was designed using the PCB resin as the sub-layer and the PCBG-10 or PCBG-15 film as the up-layer. The great long-term corrosion resistance of the coatings was confirmed by electrochemical measurements in salt immersion and salt-spray. It is expected that this new design of the promising polybenzoxazine resin coating system will find wide applications in marine industry and relevant fields.

聚苯并恶嗪是一种出色且极具前景的树脂，可用于许多高级应用。本文报道了一系列由苯并恶嗪单体通过姜黄素、3-氨基丙基三乙氧基硅烷和多聚甲醛的曼尼希反应合成的可持续高性能涂料。这种基于姜黄素的聚苯并恶嗪树脂首次被实验证明是一种有效的阻隔层，可以明显降低基材金属的腐蚀速率，并显着抵抗污垢附着。此外，发现树脂中PEG含量的增加可以进一步提高涂层的防污性能。分子动力学 (MD) 模拟表明，聚苯并恶嗪框架中精心选择的 PEG 分子密度可能会严重影响水合层和相互作用能。苯并恶嗪单体和聚合物通过傅里叶变换红外（FT-IR）、X射线光电子能谱（XPS）、质子核磁共振（¹ H NMR 和¹³C NMR) 光谱、不同的扫描量热法 (DSC) 和热重技术。通过动电位极化、电化学阻抗谱 (EIS) 以及蛋白质、细菌和微藻的附着来评估开发的聚苯并恶嗪树脂的防腐和防污性能。结果表明，聚苯并恶嗪涂料（PCB或PCBG-X）即使长期暴露在腐蚀性环境中也具有优异的防腐性能，其中一些聚苯并恶嗪涂料，如PCBG-10和PCBG-15，具有优异的防污能力。为了同时增强防腐和防污性能，设计了以PCB树脂为底层，PCBG-10或PCBG-15薄膜为上层的双层涂层系统。通过盐浸和盐雾中的电化学测量证实了涂层具有良好的长期耐腐蚀性。预计这种有前途的聚苯并恶嗪树脂涂层系统的新设计将在海洋工业和相关领域得到广泛应用。