Fundamental study on the extraction of uniform nanofibers from plant-biomass

对从木浆中提取纤维素纳米纤维的工艺进行了研究，找出了研磨机、高压均质机、珠磨机和双螺杆挤出机等原纤化设备的优缺点。利用该设备对磨浆机处理的漂白硫酸盐浆(软木)进行了不同时间的处理。原纤化牙髓的扫描电子显微镜图像因设备和道次不同而不同。阐明了每种设备随着道次的增加，结晶度降低的程度、纤维素相对分子质量的变化以及热重分析所评价的耐热性。比较了原纤化纸浆制备的板材的拉伸性能。在此基础上，我们通过化学提纯(去除非纤维素成分)和高速搅拌机的前处理(纤维结构破碎)，结合高压均质，成功地将干燥的粗棉纤维原纤化成单独的纤维素NaO纤维。

The process to extract cellulose nanofibers from wood pulp was studied to find out advantage and disadvantage of fibrillation equipment such as grinder, high-pressure homogenizer, bead mill and twin screw extruder. The refiner treated bleached kraft pulp (soft wood) was treated at various times with the equipment. FE-SEM images of fibrillated pulp differed with the equipment and the number of passes. The degree of decrease in crystallinity, changes in molecular weight of cellulose and thermal durability evaluated by TGA with the increase of the number of passes were clarified for each equipment. The tensile properties of the sheet prepared from the fibrillated pulp were compared. On the basis of the results, we succeeded to fibrillate the raw dried cotton fibers into individual cellulose naofibers by chemical purification (removal of non-cellulosic components) and a pretreatment by a high-speed blender (breaking down of fiber structures), combined with high-pressure homogenization.