Lemos Cosse Renato, van den Berg Thijs, Voet Vincent, Folkersma Rudy, Loos Katja
Macromolecular Chemistry and New Polymeric Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The, Netherlands.
Circular Plastics, NHL Stenden University of Applied Sciences, Van Schaikweg 94, 7811 KL, Emmen, The, Netherlands.
Chempluschem. 2024 Sep;89(9):e202300714. doi: 10.1002/cplu.202300714. Epub 2024 Jul 23.
The current study focused on improving the properties of polylactic acid (PLA) for wider application in load-bearing scenarios. Various methods were explored to optimize the interaction between PLA and natural fibers, particularly wood fibers (WFs). Alkalized and epoxy-impregnated WFs were evaluated against untreated WFs and cellulose fibers in both injection molding (IM) and fused deposition modeling (FDM). FTIR analysis revealed the removal of hemicellulose and lignin in alkalized WFs and uniform epoxy curing. Addition of fibers reduced PLA's thermal stability while acting as nucleating agents. Additionally, fibers augmented the storage modulus of biocomposites, with alkalized fibers exhibiting the highest tensile modulus in IM. FDM samples with a 0° raster angle showed superior impact resistance compared to IM counterparts. Moreover, raster angle significantly influenced FDM biocomposite properties, enhancing the tensile strength and modulus of untreated WF and cellulose fibers at 0°. Although FDM did not produce alkalized WF samples, epoxy impregnation emerged as a promising method for enhancing PLA/WF composite mechanical properties in the IM process, offering valuable insights for composite material development.
当前的研究聚焦于改善聚乳酸（PLA）的性能，以便在承重场景中更广泛地应用。人们探索了各种方法来优化PLA与天然纤维，特别是木纤维（WFs）之间的相互作用。在注塑成型（IM）和熔融沉积成型（FDM）中，对碱化和环氧浸渍的木纤维与未处理的木纤维及纤维素纤维进行了评估。傅里叶变换红外光谱（FTIR）分析表明，碱化木纤维中的半纤维素和木质素被去除，且环氧固化均匀。纤维的添加降低了PLA的热稳定性，同时起到了成核剂的作用。此外，纤维提高了生物复合材料的储能模量，在注塑成型中，碱化纤维表现出最高的拉伸模量。与注塑成型的样品相比，0°光栅角的熔融沉积成型样品具有更好的抗冲击性。此外，光栅角对熔融沉积成型生物复合材料的性能有显著影响，在0°时提高了未处理木纤维和纤维素纤维的拉伸强度和模量。尽管熔融沉积成型没有生产出碱化木纤维样品，但环氧浸渍在注塑成型过程中成为增强PLA/木纤维复合材料机械性能的一种有前景的方法，为复合材料的开发提供了有价值的见解。
