Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China.
Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China.
Carbohydr Polym. 2018 Apr 15;186:252-259. doi: 10.1016/j.carbpol.2018.01.055.
Cellulose nanocrystals (CNCs) are predominantly obtained by the traditional sulfuric acid hydrolysis process. However, as-prepared CNCs powder features low thermal stability and poor redispersibility due to the existence of sulfonate groups and the hydrogen bond interaction among particles. Herein, by mixing the ionic liquid [BMIm][BF] with freshly prepared CNCs without dialysis through a simple rotary evaporate procedure, the simultaneous improvement of thermal stability and redispersibility of CNCs has been achieved. By combining FTIR, TGA and DLS measurements, the critical role of rotary evaporates process for improving the thermal stability of CNCs has been discussed. Furthermore, the poly(lactic acid) (PLLA)/IL-CNC nanocomposites with enhanced mechanical properties were prepared by the melt-mixing method. This study provides a green and simple strategy for preparing dried CNC powders, which has a great potential in large-scale production of fully bio-based nanocomposites.
纤维素纳米晶（CNCs）主要通过传统的硫酸水解法获得。然而，由于存在磺酸基团和颗粒间氢键相互作用，所制备的 CNCs 粉末热稳定性低，再分散性差。在此，通过将离子液体[BMIm][BF]与未经透析的新鲜制备的 CNCs 在简单的旋转蒸发过程中混合，同时提高了 CNCs 的热稳定性和再分散性。通过结合 FTIR、TGA 和 DLS 测量，讨论了旋转蒸发过程对提高 CNCs 热稳定性的关键作用。此外，通过熔融混合法制备了具有增强力学性能的聚（乳酸）（PLLA）/IL-CNC 纳米复合材料。本研究为制备干燥的 CNC 粉末提供了一种绿色简单的策略，在全生物基纳米复合材料的大规模生产中具有很大的潜力。
