具有超高纯纤维素的棉纤维是生产纳米纤维素的理想原料。然而,棉纤维的强氢键和高结晶度影响棉纤维的解离制备纳米纤维素。利用傅里叶变换红外光谱(FTIR)和X射线衍射(XRD)研究了两种棉纤维(CM和XM)在花后10～50天不同生长阶段的结构。在棉纤维生长过程中,纤维素大分子的沉积速率先增加后稳定。然后，表面形态，化学成分,和由不同生长阶段的棉纤维通过深度共晶溶剂制备的纳米纤维素的晶体结构，绿色溶剂,用透射电子显微镜(TEM)表征，扫描电子显微镜（SEM）分析，XRD,和热重分析(TG)。棉纤维的生长时间影响了纳米纤维素的性能,从约30dpa的棉纤维获得的纳米纤维素具有更少的能量消耗，更高的产量，和温和的反应条件。
Cotton fibers with ultra-high purity cellulose are ideal raw materials for producing nanocellulose. However, the strong hydrogen bond and high crystallinity of cotton fibers affect the dissociation of cotton fibers to prepare nanocellulose. The structures of two kinds of cotton fibers (CM and XM) in different growth stages from 10 to 50 days post-anthesis (dpa) were studied by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). In the process of cotton fiber growth, the deposition rate of cellulose macromolecules firstly increased and then stabilized. Then, the surface morphology, the chemical composition, and the crystal structure of the nanocellulose prepared from cotton fibers with different growth stages by deep eutectic solvent, a green solvent, were characterized by Transmission Electron Microscope (TEM), scanning electron microscopy (SEM) analysis, XRD, and Thermo Gravimetry (TG). The growth time of cotton fibers affected the properties of prepared nanocellulose, and nanocellulose obtained from cotton fibers at about 30 dpa had less energy consumption, higher yield, and milder reaction conditions.
