State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute at Sichuan University, Chengdu 610065, China.
Carbohydr Polym. 2013 Sep 12;97(2):695-702. doi: 10.1016/j.carbpol.2013.05.050. Epub 2013 May 25.
The objective of this study was to extract cellulose nanofibrils (CNFs) from dry softwood pulp through a simple and environmentally friendly physical method of refining pretreatment coupled with high shear homogenization. An optical microscopy (OM) clearly showed the morphological development from the cellulose fibers to CNFs under repeated shear forces. The morphology, structure and properties of the obtained CNFs were comprehensively investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transformed infrared (FTIR) spectra, X-ray diffraction (XRD) and thermogravimetric (TG) analysis. The results indicated that the CNFs had diameters mainly ranged from 16 to 28nm. Compared with the pulp fibers, the CNFs exhibited a slightly higher crystallinity and a lower thermal stability. Moreover, a novel nanopaper with high optical transparency was prepared from the obtained CNFs, and a possible mechanism for the high optical transparency was discussed.
本研究的目的是通过简单环保的物理方法——精炼预处理与高剪切均化相结合，从干燥的软木浆中提取纤维素纳米纤维（CNF）。光学显微镜（OM）清晰地显示了在反复剪切力作用下，纤维素纤维向 CNF 形态演变的过程。利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外（FTIR）光谱、X 射线衍射（XRD）和热重（TG）分析等手段对所得到的 CNF 的形貌、结构和性能进行了综合研究。结果表明，CNF 的直径主要分布在 16 至 28nm 之间。与纸浆纤维相比，CNF 的结晶度略高，热稳定性略低。此外，还利用所得到的 CNF 制备了具有高光学透明度的新型纳米纸，并对其高光学透明度的可能机制进行了探讨。
