Faculty of Forestry and Wood Technology, Poznań University of Life Sciences, Wojska Polskiego Str. 28, 60-637 Poznań, Poland.
NanoBioMedical Centre, Adam Mickiewicz University, ul. Wszechnicy Piastowskiej 3, 61-614 Poznań, Poland.
Molecules. 2022 Jul 22;27(15):4696. doi: 10.3390/molecules27154696.
This article describes how crystalline or fibrous nanocellulose influences the mechanical properties of paper substrate. In this context, we used commercially available cellulose nanocrystals, mechanically prepared cellulose nanofibers dispersed in water or ethanol, and carboxy cellulose nanofibers. Selective reinforcement of the paper treated with the nanocellulose samples mentioned above was observed. The change in the fibre structure was assessed using scanning electron microscopy, roentgenography, and spectroscopy techniques. In addition, the effect of nanocellulose coating on physical properties was evaluated, specifically tensile index, elongation coefficient, Elmendorf tear resistance, Bendtsen surface roughness, Bendtsen air permeability, and bending strength. It can be concluded that the observed decrease in the strength properties of the paper after applying some NC compositions is due to the loss of potential disturbances in hydrogen bonds between the nanocellulose dispersed in ethanol and the paper substrate. On the other hand, significantly increased strength was observed in the case of paper reinforced with nanocellulose functionalized with carboxyl groups.
本文描述了结晶或纤维状纳米纤维素如何影响纸基的机械性能。在这方面，我们使用了市售的纤维素纳米晶，在水中或乙醇中分散的机械制备的纤维素纳米纤维，以及羧基纤维素纳米纤维。观察到用上述纳米纤维素样品处理的纸张具有选择性增强。使用扫描电子显微镜、伦琴射线和光谱技术评估纤维结构的变化。此外，还评估了纳米纤维素涂层对物理性能的影响，特别是抗张指数、伸长系数、爱伦门多夫撕裂强度、本特森表面粗糙度、本特森透气性和弯曲强度。可以得出结论，在应用一些 NC 组合物后观察到纸张强度性能的下降是由于乙醇中分散的纳米纤维素与纸基材之间氢键的潜在干扰的损失。另一方面，在用羧基官能化的纳米纤维素增强的纸张的情况下，观察到强度显著增加。
