Lou Shuo, Huang Yong, Wu Min
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, PR China.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
Carbohydr Polym. 2023 Feb 15;302:120421. doi: 10.1016/j.carbpol.2022.120421. Epub 2022 Nov 29.
Cellulose is regarded as the most abundant biomass, and nanocellulose derived from it has numerous applications in environmentally friendly materials. However, owing to the abundant hydroxyl groups on surface, nanocellulose is prone to agglomeration when transported, stored, or made into materials, which destroys material performance and limits its use. In this study, a feasible method was presented for regulating the hydrogen bonding strength between cellulose nanofibers (CNFs) by adding a minute quantity of rare earth ions Y during cellulose nanofibrillation. It was found that the strength of hydrogen bonding between CNFs can be regulated by controlling the quantity of Y in the system. The dispersibility and stability of CNFs, as well as the mechanical properties of CNFs films and CNFs-reinforced papers can be improved by 43.07 % and by 64.05 % after adding only 0.05 or 0.075 wt% Y. The possible mechanism of CNFs hydrogen bonding network reconstruction was proposed.
纤维素被视为最丰富的生物质，从中提取的纳米纤维素在环保材料中有众多应用。然而，由于纳米纤维素表面存在大量羟基，在运输、储存或制成材料时容易发生团聚，这会破坏材料性能并限制其使用。在本研究中，提出了一种可行的方法，即在纤维素纳米纤维化过程中添加微量稀土离子Y来调节纤维素纳米纤维（CNF）之间的氢键强度。研究发现，通过控制体系中Y的含量可以调节CNF之间的氢键强度。仅添加0.05或0.075 wt%的Y后，CNF的分散性和稳定性以及CNF薄膜和CNF增强纸的机械性能可分别提高43.07%和64.05%。此外，还提出了CNF氢键网络重建的可能机制。
