Yue Daran, Qian Xueren
Key Laboratory of Bio-Based Materials Science and Technology of Ministry of Education, Northeast Forestry University, No. 26 Hexing Road, Xiangfang District, Harbin 150040, China.
Polymers (Basel). 2018 Mar 14;10(3):320. doi: 10.3390/polym10030320.
In this report, the isolation and rheological characterization of cellulose nanofibrils from coir (CNFs-1) were studied and compared with the CNFs from wood (CNFs-2) and cotton (CNFs-3). Cellulose nanofibrils were isolated successfully from coir fibers by chemical treatments followed by ultrasonic fibrillation. During ultrasonic processing, the size and the crystal structure of the CNFs were influenced by the raw materials. In comparison to CNFs-2 and CNFs-3, CNFs-1 from coir fibers presented diverse advantages, such as sufficient fibrillation with a low diameter distribution, in the range of 2⁻4 nm and high crystallinity. In the dynamic rheology study of CNFs-1, elastic behavior was observed and maintained due to the formation of gel-like steady network structures, which could not be easily deconstructured by frequency shearing and temperature changing. All results indicated that coir fibers could be used as a valuable resource for the preparation of CNFs, which exhibited comparable properties with those isolated from wood, in regard to morphology and rheological properties. This work provides a basis for further advanced applications using the CNFs isolated from coir fibers.
在本报告中，对椰壳纤维素纳米纤丝（CNFs - 1）的分离及其流变学特性进行了研究，并与木质纤维素纳米纤丝（CNFs - 2）和棉纤维素纳米纤丝（CNFs - 3）进行了比较。通过化学处理随后超声纤化，成功从椰壳纤维中分离出纤维素纳米纤丝。在超声处理过程中，纤维素纳米纤丝的尺寸和晶体结构受原材料影响。与CNFs - 2和CNFs - 3相比，椰壳纤维来源的CNFs - 1具有多种优势，如充分纤化、直径分布低（在2⁻4纳米范围内）且结晶度高。在对CNFs - 1的动态流变学研究中，由于形成了凝胶状稳定网络结构，观察到并保持了弹性行为，这种结构不易因频率剪切和温度变化而解构。所有结果表明，椰壳纤维可作为制备纤维素纳米纤丝的宝贵资源，其在形态和流变学特性方面与从木材中分离得到的纤维素纳米纤丝具有相当的性能。这项工作为进一步利用从椰壳纤维中分离出的纤维素纳米纤丝进行高级应用提供了基础。
