Key Laboratory of High Efficiency and Clean Mechanical Manufacture (M of E), School of Mechanical Engineering, National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, 17923 Jingshi Road, Jinan, 250061, China; Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, M5S 3E5, Canada.
Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, M5S 3E5, Canada; Faculty of Forestry, University of Toronto, 33 Willcocks Street, Toronto, Ontario, M5S 3B3, Canada; John H. Daniels Faculty of Architecture, Landscape, and Design, University of Toronto, 1 Spadina Crescent, Toronto, Ontario, M5S 2J5, Canada.
Carbohydr Polym. 2020 Feb 15;230:115626. doi: 10.1016/j.carbpol.2019.115626. Epub 2019 Nov 15.
Lignin containing cellulose nanofibrils (LCNF) were obtained by mechanically fibrillating unbleached tree bark after alkaline extraction and used as a reinforcement in thermoplastic starch (TPS) to develop novel biodegradable composite films. With the addition of 15 wt % LCNF, the tensile strength and modulus of the composites increased by 319 % and 800 % compared to neat TPS films, respectively. The crystalline property of cellulose and the high interaction between TPS and LCNF improved the mechanical property of the composite films. The composite film T and T were 263.1 °C and 316.5 °C, respectively, compared to 250.5 °C and 297.3 °C for neat TPS. The composite films also showed higher water barrier property. Experimental results showed that LCNF features a high lignin content. Lignin, a natural polymer, contains hydrophobic and aromatic groups and, thus, can increase the water barrier property and thermal stability of TPS/LCNF composite films.
含有纤维素纳米纤维的木质素（LCNF）通过机械纤化未经漂白的树皮在碱性提取后获得，并用作热塑性淀粉（TPS）的增强剂，以开发新型可生物降解的复合膜。与纯 TPS 薄膜相比，添加 15wt%的 LCNF 后，复合材料的拉伸强度和模量分别提高了 319%和 800%。纤维素的结晶性能和 TPS 与 LCNF 之间的高相互作用提高了复合膜的力学性能。与纯 TPS 相比，复合膜 T 和 T 分别为 263.1°C 和 316.5°C。复合膜还表现出更高的水阻隔性能。实验结果表明，LCNF 具有高木质素含量。木质素是一种天然聚合物，含有疏水性和芳香性基团，因此可以提高 TPS/LCNF 复合膜的水阻隔性能和热稳定性。
