Li Weidong, Xue Yu, He Ming, Yan Jiaqiang, Lucia Lucian A, Chen Jiachuan, Yu Jinghua, Yang Guihua
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
Nanomaterials (Basel). 2021 Oct 21;11(11):2778. doi: 10.3390/nano11112778.
A deep eutectic solvent (DES) composed of sulfamic acid and glycerol allowed for the sustainable preparation of cellulose nanofibrils (CNF) with simultaneous sulfation. The reaction time and the levels of sulfamic acid demonstrated that fibers could be swelled and sulfated simultaneously by a sulfamic acid-glycerol-based DES and swelling also promoted sulfation with a high degree of substitution (0.12). The DES-pretreated fibers were further nanofibrillated by a grinder producing CNF with diameters from 10 nm to 25 nm. The crystallinity ranged from 53-62%, and CNF maintained the original crystal structure. DES pretreatment facilitated cellulose nano-fibrillation and reduced the energy consumption with a maximum reduction of 35%. The films prepared from polyvinyl alcohol (PVA) and CNF showed good UV resistance ability and mechanical properties. This facile and efficient method provided a more sustainable strategy for the swelling, functionalization and nano-fibrillation of cellulose, expanding its application to UV-blocking materials and related fields.
由氨基磺酸和甘油组成的深共熔溶剂（DES）能够可持续地制备同时进行硫酸化的纤维素纳米纤丝（CNF）。反应时间和氨基磺酸的用量表明，基于氨基磺酸-甘油的DES能够使纤维同时发生溶胀和硫酸化，而且溶胀还促进了高取代度（0.12）的硫酸化。经DES预处理的纤维通过研磨机进一步纳米纤化，得到直径为10纳米至25纳米的CNF。结晶度在53%至62%之间，并且CNF保持了原始晶体结构。DES预处理促进了纤维素的纳米纤化，并降低了能耗，最大降幅为35%。由聚乙烯醇（PVA）和CNF制备的薄膜表现出良好的抗紫外线能力和机械性能。这种简便高效的方法为纤维素的溶胀、功能化和纳米纤化提供了一种更具可持续性的策略，拓展了其在紫外线阻隔材料及相关领域的应用。
