Zhang Shen, Wang Zhiyuan, Li Chunyu, Zheng Yuduo, Xu Jingliang
School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China; Henan Center for Outstanding Overseas Scientists, Zhengzhou 450001, China; National Key Laboratory of Biobased Transportation Fuel Technology, China.
School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China.
Int J Biol Macromol. 2025 Feb;289:138779. doi: 10.1016/j.ijbiomac.2024.138779. Epub 2024 Dec 13.
Renewable materials derived from lignocellulose are promising materials for different practical applications, including biomedical, food, and agricultural fields. However, the poor mechanical performance and wet stability restrict their applications. Herein, we fabricated PVA/lignocellulose/PBAT (PVA/CLM/PBAT) composite with a "sandwich" structure. Cellulose-lignin mixture (CLM) was prepared by deep eutectic solvent (DES) pretreatment of corn straw. It served as a reinforcing scaffold of Poly (Vinyl Alcohol) (PVA) film for improving mechanical properties, UV blocking and decrease water permeability. Poly (butylene adipate-co-terephthalate) (PBAT) was used as "protector" with PVA/CLM composites by solvent coating method. The tensile strength of PVA/CLM/PBAT is 63.92 MPa. The results show that 27.93 MPa of tensile strength and 179.98 % of elongation at break of PVA/CLM/PBAT are achieved after immersing in water for 2 h, which was remarkable higher than that of PVA/CLM without PBAT coating (4.78 MPa and 111.43 %, respectively). The bonding strength of PVA/CLM/PBAT is 2.44 ± 0.06 N/15 mm. The hydrogen bonds, π-π interaction between PBAT, PVA, and CLM enhance the bonding strength of PVA/CLM/PBAT composites. The water absorption rate of PVA/CLM/PBAT is only 4.4 % after 20 h, which showed a remarkable water resistance. 25 wt% CLM content in PVA/CLM/PBAT composite can fully shield ultraviolet at 200-800 nm, indicating that the remarkable UV shielding capability.
源自木质纤维素的可再生材料是用于不同实际应用的有前景的材料，包括生物医学、食品和农业领域。然而，其较差的机械性能和湿稳定性限制了它们的应用。在此，我们制备了具有“三明治”结构的PVA/木质纤维素/PBAT（PVA/CLM/PBAT）复合材料。纤维素-木质素混合物（CLM）通过对玉米秸秆进行深共熔溶剂（DES）预处理制备。它用作聚（乙烯醇）（PVA）薄膜的增强支架，以改善机械性能、紫外线阻隔性能并降低透水性。聚（己二酸丁二醇酯-co-对苯二甲酸丁二醇酯）（PBAT）通过溶剂涂布法用作PVA/CLM复合材料的“保护剂”。PVA/CLM/PBAT的拉伸强度为63.92MPa。结果表明，PVA/CLM/PBAT在水中浸泡2小时后，拉伸强度达到27.93MPa，断裂伸长率达到179.98%，这显著高于未涂覆PBAT的PVA/CLM（分别为4.78MPa和111.43%）。PVA/CLM/PBAT的粘结强度为2.44±0.06N/15mm。PBAT、PVA和CLM之间的氢键、π-π相互作用增强了PVA/CLM/PBAT复合材料的粘结强度。PVA/CLM/PBAT在20小时后的吸水率仅为4.4%，显示出显著的耐水性。PVA/CLM/PBAT复合材料中25wt%的CLM含量可在200-800nm范围内完全屏蔽紫外线，表明其具有显著的紫外线屏蔽能力。
