Ahmed Farooq, Ayoub Arbab Alvira, Jatoi Abdul Wahab, Khatri Muzamil, Memon Najma, Khatri Zeeshan, Kim Ick Soo
Nanomaterials Research Lab, Department of Textile Engineering, Mehran University of Engineering and Technology, Jamshoro 76062, Pakistan.
Nanomaterials Research Lab, Department of Textile Engineering, Mehran University of Engineering and Technology, Jamshoro 76062, Pakistan; Nano Fusion Technology Research Group, Division of Frontier Fibers, Institute for Fiber Engineering (IFES), Interdisciplinary Cluster for Cutting Edge Research (ICCER), Shinshu University, Tokida 3-15-1, Ueda, Nagano Prefecture 386-8567, Japan.
Ultrason Sonochem. 2017 May;36:319-325. doi: 10.1016/j.ultsonch.2016.12.013. Epub 2016 Dec 11.
Herein we report a rapid method for deacetylation of cellulose acetate (CA) nanofibers in order to produce cellulose nanofibers using ultrasonic energy. The CA nanofibers were fabricated via electrospinning thereby treated with NaOH and NaOH/EtOH solutions at various pH levels for 30, 60 and 90min assisted by ultrasonic energy. The nanofiber webs were optimized by degree of deacetylation (DD%) and wicking behavior. The resultant nanofibers were further characterized by FTIR, SEM, WAXD, DSC analysis. The DD% and FTIR results confirmed a complete conversion of CA nanofibers to cellulose nanofibers within 1h with substantial increase of wicking height. Nanofibers morphology under SEM showed slightly swelling and no damage of nanofibers observed by use of ultrasonic energy. The results of ultrasonic-assisted deacetylation are comparable with the conventional deacetylation. Our rapid method offers substantially reduced deacetylation time from 30h to just 1h, thanks to the ultrasonic energy.
在此，我们报告一种快速方法，用于对醋酸纤维素（CA）纳米纤维进行脱乙酰化，以便利用超声能量制备纤维素纳米纤维。通过静电纺丝制备CA纳米纤维，然后在超声能量辅助下，用不同pH值的NaOH和NaOH/EtOH溶液处理30、60和90分钟。通过脱乙酰度（DD%）和芯吸行为对纳米纤维网进行优化。所得纳米纤维通过FTIR、SEM、WAXD、DSC分析进一步表征。DD%和FTIR结果证实，CA纳米纤维在1小时内完全转化为纤维素纳米纤维，芯吸高度显著增加。SEM下的纳米纤维形态显示略有肿胀，且使用超声能量未观察到纳米纤维受损。超声辅助脱乙酰化的结果与传统脱乙酰化相当。由于超声能量，我们的快速方法将脱乙酰化时间从30小时大幅缩短至仅1小时。
