Yuan Xi, Fu Shiyu, Liu Hao
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
South China University of Technology-Zhuhai Institute of Modern Industrial Innovation, Zhuhai 519175, China.
Materials (Basel). 2025 Mar 17;18(6):1314. doi: 10.3390/ma18061314.
The current widespread use of plastics is a significant source of environmental pollution and increases the carbon load in the atmosphere, which has precipitated an urgent drive to replace plastics with biomass-based materials. In this paper, we prepared a lignocellulose-based, high-strength, water-resistant composite based on eucalyptus waste sawdust combined with a polyurethane prepolymer. The preparation process included pretreating sawdust with deep eutectic solvents (DESs) to remove some of the lignin and hemicellulose. A prepolymer preparation involving isocyanate groups using the prepolymerization of polyethylene glycol (PEG) with hexamethylene diisocyanate (HDI) grafted the prepolymers to the hydroxyl of the pretreated wood fibers, which were subsequently blended with acetylated pretreated sawdust to create the composite. The composite contained 67% wood fibers, possessed good tensile strength, and exhibited Young's moduli of 18 MPa and 484 MPa. It was water-resistant with a contact angle of 92° and had a low water absorption of 32%, and it maintained a wet tensile strength of 5.71 MPa. The composite offers several advantages, including UV protection and thermal stability. This high-performance wood waste composite provides an alternative green production option for producing plastic materials.
目前塑料的广泛使用是环境污染的一个重要来源，并增加了大气中的碳负荷，这促使人们迫切地推动用生物质基材料替代塑料。在本文中，我们以桉木废木屑与聚氨酯预聚物为原料，制备了一种基于木质纤维素的高强度、防水复合材料。制备过程包括用深共晶溶剂（DESs）预处理木屑以去除部分木质素和半纤维素。通过聚乙二醇（PEG）与六亚甲基二异氰酸酯（HDI）的预聚反应制备含异氰酸酯基团的预聚物，并将其接枝到经预处理的木纤维羟基上，随后与乙酰化预处理的木屑混合制成复合材料。该复合材料含有67%的木纤维，具有良好的拉伸强度，杨氏模量分别为18 MPa和484 MPa。它具有防水性，接触角为92°，吸水率低至32%，并且保持5.71 MPa的湿态拉伸强度。该复合材料具有多种优点，包括紫外线防护和热稳定性。这种高性能的木材废料复合材料为生产塑料材料提供了一种绿色生产的替代选择。
