Abstract Cellulose nanocrystals (CNCs), a robust renewable and green nanomaterial, has potential as an excellent reinforcing and multifunctional filler for polymers used in coating and other applications. However, the high polarity of CNCs limits its interfacial interaction and dispersibility with several non-polar polymers. These limitations severely constrain it from transferring its functional attributes to polymeric materials. In this paper, three differentiated cationic surfactants: cetyltetramethylammoniumbromide (CTAB, C16 single chain), dimethyldidodecylammonium bromide (DDAB, C12 double chains) and dimethyldihexadecylammonium (DHAB, C16 double chains) were used to modify the surface of CNCs. The modifications were confirmed using Fourier-Transform Infrared Spectroscopy (FTIR) and elemental analysis. X-ray diffraction (XRD) and thermogravimetric analysis (TGA) of the samples revealed that the crystallinities and the thermal stabilities of the modified CNCs were preserved. Corrosion protection studies of epoxy nanocomposites containing the native and surfactant modified CNCs were conducted using model steel specimens via salt spray and electrochemical test methods. The results reported herein indicated that the use of surfactant modified CNCs resulted in an enhanced dispersibility in the epoxy matrices as compared to native CNCs. The improved dispersion assisted in retardation of the penetration of electrolyte that caused a remarkable improvement in the metal corrosion protection performance, as compared to unfilled or native CNC filled epoxy coatings.

中文翻译：

---

用于防腐纳米复合材料表面涂层的阳离子表面活性剂改性纤维素纳米晶体

摘要 纤维素纳米晶体 (CNC) 是一种坚固的可再生绿色纳米材料，具有作为涂层和其他应用中聚合物的优异增强和多功能填料的潜力。然而，CNCs 的高极性限制了它与几种非极性聚合物的界面相互作用和分散性。这些限制严重限制了它将其功能属性转移到聚合物材料上。在本文中，三种不同的阳离子表面活性剂：十六烷基四甲基溴化铵（CTAB，C16 单链）、二甲基二十二烷基溴化铵（DDAB，C12 双链）和二甲基二十六烷基铵（DHAB，C16 双链）用于对 CNCs 表面进行改性。使用傅里叶变换红外光谱 (FTIR) 和元素分析证实了这些修改。样品的 X 射线衍射 (XRD) 和热重分析 (TGA) 表明，改性 CNCs 的结晶度和热稳定性得以保留。使用模型钢试样通过盐雾和电化学测试方法对含有天然和表面活性剂改性的 CNC 的环氧纳米复合材料进行了腐蚀保护研究。本文报道的结果表明，与天然 CNCs 相比，使用表面活性剂改性的 CNCs 导致在环氧基质中的分散性增强。与未填充或天然 CNC 填充环氧树脂涂层相比，改进的分散有助于延迟电解质的渗透，从而显着提高金属腐蚀防护性能。