文献类型：期刊文献

英文题名：Enhancing Water Resistance and Mechanical Properties of Waterborne Polyurethane Coating Films via Surface Modification of Cellulose Nanocrystals With Long-Chain Alkyl Alcohols

作者：Zhan, Xun[1] Chen, Jian[1] Kang, Yanhua[1] Yang, Zhaozhe[1] Wu, Guomin[1] Kong, Zhenwu[1]

第一作者：Zhan, Xun

通信作者：Wu, GM[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Natl Engn Res Ctr Low Carbon Proc & Utilizat Fores, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Nanjing, Jiangsu, Peoples R China

年份：2025

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20251518220055);Scopus(收录号：2-s2.0-105002308231);WOS:【SCI-EXPANDED(收录号:WOS:001462686700001)】；

基金：This work was supported by the Natural Science Foundation of Jiangsu Province (BK20241746).

语种：英文

外文关键词：cellulose and other wood products; coatings; functionalization of polymers; surfaces and interfaces

摘要：In the application of waterborne coatings, enhancing the water resistance and mechanical properties of coating films derived from waterborne coatings has been a critical challenge in need of urgent resolution. To tackle this issue, we propose an innovative strategy that involves surface modification of cellulose nanocrystals (CNC) using long-chain alkyl alcohols and the preparation of polyurethane composite films with excellent hydrophobicity by compounding the modified CNC (C-CNC) with waterborne polyurethane (WPU). Using a custom mold, we achieved surface hydrophobic functionalization. This study delves into the impact of CNC on the hydrophobic composite film, particularly focusing on its contribution to film morphology, thermal properties, and mechanical properties, significantly enhancing its hydrophobicity. Experimental results demonstrate that the mold with a rough surface constructs numerous rough and porous structures on the coating film surface, significantly enhancing its hydrophobicity. Notably, the C28-CNC/WPU composite film prepared using octacosanol-modified CNC exhibits the best hydrophobicity, with a water contact angle reaching 122.80 degrees. This strategy of preparing hydrophobic coating films through a simple and effective method not only overcomes limitations of waterborne coatings in terms of water resistance and mechanical properties but also holds significant potential for environmentally friendly coatings, offering new insights for waterborne coating development.