Study on how to extract nano fiber clusters from bamboo and their application

被称为MFC（微原纤化纤维素）的纳米纤维是从竹子和其他植物纸浆中提取的。当它们被机械提取时，MFC形成NFC（纳米纤维簇）。首先，用原纤化竹单丝/BNFC增强PLA。PLA是脆性的并且不耐温。随着用于提取的机械过程的增加，NFC变得复杂。由于纳米纤维表面的亲水性随着水化过程的增加而增加，因此通过吸水率可以很好地定量测定簇合度α。BNFC与PLA共混时，为提高其韧性、强度和耐热性，α=3.5为宜。通过添加少量的NFC，光固化环氧树脂的延展性得到了很好的改善。NFC是亲水性的，并且开发了诸如乙醇的溶剂置换方法。少量的NFC（0.5~1%分散）可显著提高光固化环氧树脂的断裂韧性。最后，用1%的NFC改性碳纤维复合材料的环氧基体，并在拉伸-拉伸载荷下检查其高周疲劳强度。当在环氧树脂中掺入0.3wt%的NFC时，疲劳寿命得到了显著的延长，其中也采用了乙醇置换法。

Nano fibers called MFC (Micro-Fibrillated Cellulose) were extracted from raw bamboo as well as other plant pulps. When they are mechanically extracted, MFC forms NFC (Nano Fiber Cluster). First, PLA was reinforced with fibrillated bamboo mono-filaments/BNFC. PLA is brittle and less temperature resistance. With an increase of mechanical process for extracting, NFC becomes complicated. The degree of cluster, α was well quantitatively determined by water absorption since the surface of nano fiber cellulose being hydrophilic increased with an increase of fibrillating process. When BNFC was mixed with PLA to form compounds for improving its toughness, strength and thermal resistance, α=3.5 was suitable. Light curing epoxy was well modified in its ductility by adding a small amount of NFC. NFC was hydrophilic, and solvent replacement method such as ethanol was developed. The fracture toughness of light curing epoxy significantly increased due to a small amount of NFC, 0.5～1% dispersion. Finally, epoxy matrix of carbon fiber composites was modified with NFC up to 1% and their high cycle fatigue strength was examined under tension-tension loading. The significant extension of fatigue life was obtained when 0.3wt% NFC was mixed into epoxy resin, where the ethanol replacement method was also applied.