Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China; Limerick Pulp & Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China.
Carbohydr Polym. 2016 Oct 20;151:326-334. doi: 10.1016/j.carbpol.2016.05.083. Epub 2016 May 24.
In this work, TEMPO-oxidized cellulose nanofibers (TOCNs) were investigated as a green additive to the waterborne polyurethane (WPU) based coating, for improving its mechanical properties. The structure, morphology, mechanical properties and performances of the WPU/TOCNs coating were determined. Results showed that TOCNs had good compatibility to the WPU coating, and significantly enhanced the mechanical properties of the coating. The Halpin-Tsai and Ouali models were used to fit for the Young's modulus of the resulting coating, and good agreements were found between the Ouali model and experimental results when the TOCNs content exceeded the critical percolation threshold (0.7vol% or 1.0wt%). It was also found that the pencil hardness of the coating was improved with the addition of TOCNs. However, AFM and pull-off test revealed the negative effects of the TOCNs addition on the surface roughness and adhesion strength of the coating to the wood surface.
在这项工作中，研究了 TEMPO 氧化的纤维素纳米纤维（TOCNs）作为一种绿色添加剂加入到基于水性聚氨酯（WPU）的涂层中，以提高其机械性能。测定了 WPU/TOCNs 涂层的结构、形态、力学性能和性能。结果表明，TOCNs 与 WPU 涂层具有良好的相容性，并显著提高了涂层的力学性能。使用 Halpin-Tsai 和 Ouali 模型对所得涂层的杨氏模量进行拟合，当 TOCNs 含量超过临界渗流阈值（0.7vol%或 1.0wt%）时，Ouali 模型与实验结果之间存在良好的一致性。还发现随着 TOCNs 的加入，涂层的铅笔硬度得到提高。然而，AFM 和拉脱试验表明，TOCNs 的加入对涂层表面粗糙度和对木材表面的附着力有负面影响。
