Huang Haicheng, Chen Chaopei, Abdalkarim Somia Yassin Hussain, Liu Yuheng, Chen Kaiwei, Mehanny Sherif, Yu Hou-Yong
State Key Laboratory of Bio-based Fiber Materials , Zhejiang Sci-Tech University, Xiasha Higher Education Park Avenue 2 No.928, Hangzhou 310018, China.
State Key Laboratory of Bio-based Fiber Materials , Zhejiang Sci-Tech University, Xiasha Higher Education Park Avenue 2 No.928, Hangzhou 310018, China.
J Hazard Mater. 2025 Aug 15;494:138738. doi: 10.1016/j.jhazmat.2025.138738. Epub 2025 May 28.
Polylactic acid (PLA) is widely used in crop protection but faces challenges such as low toughness and unpredictable degradation rates. This study addresses these limitations by developing a green and durable mulch film incorporating citric acid-modified cellulose nanocrystals (CA-CNC) as an interfacial compatibilizer in PLA. Adding CA-CNC enhances the orientation of PLA molecular chains, thereby improving tensile ductility. Specifically, incorporating 5 % CA-CNC significantly increased tensile strength by 28.2 %, while toughness surged by 190.1 %. Mulch films were subjected to indoor UV light and outdoor degradation in soil and cultivation environments (using soybean as a case study) to explore degradation mechanisms. Notably, the mulch film with 5 % CA-CNC completely fragmented after 140 days of soil degradation, representing a higher degradation rate of 31.9 %. Meanwhile, the degradation rates observed after 90 days of outdoor cultivation environment degradation (9.8 %) and 30 days of indoor UV degradation (2.8 %) exhibit distinctions compared to outdoor soil degradation. Further analyses of changes in the physicochemical properties of mulch film confirmed the degradation mechanisms. This study provides valuable insights for estimating short-term indoor and long-term outdoor degradation of mulch films, underlining their significance in sustainable agricultural practices.
聚乳酸（PLA）在作物保护中被广泛使用，但面临着诸如韧性低和降解速率不可预测等挑战。本研究通过开发一种绿色耐用的地膜来解决这些局限性，该地膜将柠檬酸改性纤维素纳米晶体（CA-CNC）作为PLA中的界面增容剂。添加CA-CNC可增强PLA分子链的取向，从而提高拉伸延展性。具体而言，加入5%的CA-CNC可使拉伸强度显著提高28.2%，同时韧性激增190.1%。在地膜上进行室内紫外线照射以及在土壤和种植环境中进行室外降解（以大豆为例），以探究降解机制。值得注意的是，含有5%CA-CNC的地膜在土壤中降解140天后完全破碎，降解率更高，为31.9%。同时，在室外种植环境中降解90天后（降解率为9.8%）和室内紫外线降解30天后（降解率为2.8%）观察到的降解率与室外土壤降解情况有所不同。对地膜物理化学性质变化的进一步分析证实了降解机制。本研究为评估地膜的短期室内和长期室外降解提供了有价值的见解，凸显了它们在可持续农业实践中的重要性。
