College of Materials and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China; School of Materials Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China.
College of Materials and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China; Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China.
Int J Biol Macromol. 2019 May 15;129:878-886. doi: 10.1016/j.ijbiomac.2019.02.021. Epub 2019 Feb 5.
Cellulose nanocrystals (CNCs) were isolated from waste cotton cloth fibers using a mixed acid hydrolysis method and subsequently used as fillers to reinforce a polylactic acid (PLA) matrix for the construction of high performance and biodegradable PLA/CNC composite films. The morphology, structure, and thermal and mechanical properties of CNCs, PLA, and the composite films were characterized. The length, diameter, and aspect ratio of CNCs ranged from 38 to 424 nm, 2 to 17 nm, and 10-32 respectively. The crystallinity, tensile strength, elasticity modulus, and work-to-break of PLA/CNC composite films were effectively improved by the addition of 0.1 wt% and 0.3 wt% CNCs. However, poor performance parameters were acquired at higher CNC content (0.7 wt%), because the CNCs were not well distributed in the polymer matrix.
纤维素纳米晶（CNCs）采用混合酸水解法从废棉布纤维中分离出来，然后用作增强聚乳酸（PLA）基体的填料，以构建高性能和可生物降解的 PLA/CNC 复合薄膜。对 CNCs、PLA 和复合薄膜的形貌、结构、热性能和力学性能进行了表征。CNCs 的长度、直径和纵横比分别为 38 至 424nm、2 至 17nm 和 10-32。添加 0.1wt%和 0.3wt%CNCs 可有效提高 PLA/CNC 复合薄膜的结晶度、拉伸强度、弹性模量和断裂功。然而，在较高的 CNC 含量（0.7wt%）下，性能参数较差，因为 CNCs 在聚合物基体中分布不均匀。
