In this study, we synthesized and investigated bisbenzylidene cyclopentanone and cyclohexanone-functionalized polybenzoxazine nanocomposites as anti-corrosion coatings. The chemical structures of CP-BZ and CH-BZ were confirmed using Fourier transform infrared (FTIR) spectroscopy and ¹H and ¹³C nuclear magnetic resonance spectroscopy. Differential scanning calorimetry (DSC) revealed that the thermal polymerization temperature of the uncured CH-BZ (198 °C) was significantly lower than that of the monomer 3-phenyl-3,4-dihydro-2H-benzoxazine (263 °C). We used DSC and FTIR spectroscopy to study the curing behavior of these monomers. The degradation temperature of poly(CH-BZ) (326 °C) was higher than that poly(CP-BZ) (249 °C), based on thermogravimetric analysis. We used solution dispersion and thermal ring-opening polymerization to prepare a new class of bisbenzylidene-based polybenzoxazine (PBZ; CP-BZ or CH-BZ) composites with epoxidized soybean oil (E-SBO; 10 or 20 wt%) and E-SBO/bentonite (nanoclay; 3 or 5 wt%) for use as corrosion-protection coatings for mild steel (MS). We employed salt-spray and electrochemical measurements to investigate the influence of the epoxy and nanoclay contents, respectively, on the corrosion-resistance of these coatings. A 20 wt% epoxy content in the PBZ/E-SBO coatings provided corrosion-resistance superior to those of pure PBZs. Furthermore, the addition of 20 wt% E-SBO and 3 wt% of nanoclay decreased the corrosion rate by one order of magnitude (2.653 × 10^-3 mm year^–1) when compared with that of pure poly(CH-BZ) (1.292 × 10^-2 mm year–1) and two orders of magnitude when compared with blank(MS) (1.094 × 10^-1 mm year^–1) with protection efficiency (98.16 %), revealing markedly increased barrier properties of the composite coatings towards corrosive species. Thus, these materials function as excellent corrosion-resistance coatings for MS.

在这项研究中，我们合成并研究了双亚苄基环戊酮和环己酮官能化的聚苯并恶嗪纳米复合材料作为防腐涂料。CP-BZ和CH-BZ的化学结构通过傅里叶变换红外（FTIR）光谱以及¹ H和¹³ C核磁共振光谱确认。差示扫描量热法（DSC）显示，未固化的CH-BZ的热聚合温度（198°C）显着低于单体3-苯基-3,4-二氢-2 H-苯并恶嗪（263°C）。我们使用DSC和FTIR光谱研究了这些单体的固化行为。根据热重分析，聚（CH-BZ）（326°C）的降解温度高于聚（CP-BZ）（249°C）。我们使用溶液分散和热开环聚合反应制备了新型的双亚苄基聚苯并恶嗪（PBZ; CP-BZ或CH-BZ）与环氧大豆油（E-SBO; 10或20 wt％）和E- SBO /膨润土（纳米粘土； 3或5 wt％）用作低碳钢（MS）的防腐涂层。我们采用盐雾和电化学测量方法分别研究了环氧和纳米粘土含量对这些涂层耐腐蚀性能的影响。PBZ / E-SBO涂层中的环氧含量为20 wt％，其耐蚀性优于纯PBZ。^-3 mm year ^–1），与纯聚（CH-BZ）相比（1.292×10 ^-2 mm year-1），与空白（MS）相比（1.094×10 ^-1 mm，年）两个数量级^–1）的保护效率（98.16％），表明复合涂层对腐蚀性物质的阻隔性能显着提高。因此，这些材料可作为MS的优异耐腐蚀涂层。