This work presents an efficient and environmentally friendly approch to generate hydrophobic cellulose nanocrystals (CNC) using thiol-containing castor oil (CO-SH) as a renewable hydrophobe with the assist of bio-inspired dopamine at room temperature. The modification process included the formation of the polydopamine (PDA) buffer layer on CNC surfaces and the Michael addition reaction between the catechol moieties of PDA coating and thiol groups of CO-SH. The morphology, crystalline structure, surface chemistry, thermal stability and hydrophobicity of the modified CNC were charactered by TEM, XRD, FT-IR, solid-state ¹³C NMR, XPS, TGA and contact angle analysis. The modified CNC preserved cellulose crystallinity, displayed higher thermal stability than unmodified CNC, and was highly hydrophobic with a water contact angle of 95.6°. The simplicity and versatility of the surface modification strategy inspired by adhesive protein of mussel may promote rapid development of hydrophobic bio-based nanomaterials for various applications.

这项工作提出了一种高效且环保的方法，可在室温下利用含硫醇的蓖麻油（CO-SH）作为可再生的疏水物来生成疏水性纤维素纳米晶体（CNC）。改性过程包括在CNC表面上形成聚多巴胺（PDA）缓冲层，以及PDA涂层的邻苯二酚部分与CO-SH的巯基之间的迈克尔加成反应。用TEM，XRD，FT-IR，固态¹³对改性后的CNC的形貌，晶体结构，表面化学，热稳定性和疏水性进行了表征。13 C NMR，XPS，TGA和接触角分析。改性的CNC保留了纤维素的结晶度，比未改性的CNC具有更高的热稳定性，并且具有95.6°的水接触角，具有高度疏水性。贻贝的粘附蛋白激发了表面修饰策略的简单性和多功能性，可以促进疏水性生物基纳米材料在各种应用中的快速发展。