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以阔叶树材杨木木粉为原料,始终保持纤维处在水润涨的状态下,利用亚氯酸钠在酸性条件下脱除木质素,氢氧化钾脱除半纤维素,然后借助高强度超声波的空化作用,依次制备了综纤维素、纯化纤维素及木质纤维素纳米纤丝(WCNF).通过傅里叶变换红外吸收光谱(FTIR)、X射线衍射(XRD)、扫描电镜(SEM)对WCNF制备过程中的化学组分、晶型结构、结晶度及形态特征变化进行了表征,并进一步利用图像分析系统对WCNF的直径分布进行了测量统计.结果表明,WCNF的主要成分为纤维素,其晶型结构仍为纤维素Ⅰ型,结晶度为65.68%,较之原料木粉提高了12.33%.所得纤丝的直径集中分布在5～32nm之间,长度大于10μm,长径比高于300,纤丝间相互交织成网状缠结结构.WCNF的高结晶度、高长径比、纳米尺度、网状缠结结构,显示其为一种十分理想的增强增韧材料.
The broadleaf wood poplar wood flour as raw material, and always keep the fiber in a state of water up, the use of sodium chlorite in acidic conditions to remove lignin, potassium hydroxide removal of hemicellulose, and then by means of high-intensity ultrasound space (WCNFs) were prepared in turn by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) The chemical composition, crystal structure, crystallinity and morphological changes during the preparation process were characterized, and the diameter distribution of WCNF was further measured by image analysis system.The results showed that the main component of WCNF was cellulose, The crystalline structure is still cellulose type Ⅰ with a crystallinity of 65.68%, which is 12.33% higher than that of raw wood flour.The diameters of the obtained fibrils are concentrated in the range of 5 ~ 32nm, the length is greater than 10μm and the aspect ratio is higher than 300 , The intertwined filaments intertwined into a network entangled structure.WCNF high crystallinity, high aspect ratio, nano-scale, reticular entangled structure, showing it is a very good reinforcement toughening materials.