DMAc/LiCl预处理对超声剥离竹浆纤维素纳米纤维的影响

Ultrasonic Nanofibrillation of Bamboo Cellulose Fibers Enhanced by Pretreatment Using DMAc/LiCl

探索了一种简单有效的分离竹浆纤维素纳米纤维(CNF)的方法。采用N,N-二甲基乙酰胺/氯化锂(DMAc/LiCl)体系溶胀纤维素纤维作为一种预处理手段,强化声空化作用分离CNF的效果。红外光谱分析表明,该预处理能破坏纤维素的部分氢键,进而显著提高后续超声剥离CNF的效率。此外,通过扫描电子显微镜、X射线衍射、热重分析等表征方法系统研究了所制备CNF的形态、结构及性能。

A facile and effective approach was demonstrated to obtain cellulose nanofibers （CNFs） from bamboo cellulose pulp. Dimethylacetamide/lithium chloride （DMAc/LiCl） pretreatment was adopted for the preparation of CNFs, which was proved to be an effective way to remarkably promote the mechanical nanofibrillation of bamboo cellulose fibers. FT-IR analysis indicates that this pretreatment can effectively weaken the hydrogen bonds in cellulose, leading to an easier ultrasonic nanofibrillation process. The morphology, structure and properties of the as-obtained CNFs were comprehensively characterized, including SEM, XRD, thermal stability and rheological analysis. The results can further stimulate interest in the field of environmentally friendly natural nanomaterials.