Natural fibers have been widely used for reinforcing polymers attributed to their sustainable nature, excellent stiffness to weight ratio, biodegradability, and low cost compared with synthetic fibers like carbon or glass fibers. Thermoplastic composites offer an advantage of recyclability after their service life, but challenges and opportunities remain in the recycling of natural fiber reinforced polymer composites (NFRPCs). This article summarized the effects of reprocessing/recycling on the material properties of NFRPCs. The material properties considered include mechanical performance, thermal properties, hygroscopic behavior, viscoelasticity, degradation, and durability. NFRPCs can generally be recycled approximately 4–6 times until their thermomechanical properties change. After recycling 7 times, the tensile strength of NFRPCs can decrease by 17%, and the tensile modulus can decrease by 28%. The mitigation approaches to overcome degradation of material properties of NFRPCs such as adding functional additives and virgin plastics are also discussed. The main challenges in these approaches such as degradation and incompatibility are discussed, and an effort is made to provide a rationale for reprocessing/recyclability assessment. Future applications of NFRPCs such as additive manufacturing and automotive part use are discussed.

与碳纤维或玻璃纤维等合成纤维相比，天然纤维具有可持续性、优异的刚度重量比、可生物降解性和低成本，因此已广泛用于增强聚合物。热塑性复合材料在其使用寿命后具有可回收性的优势，但天然纤维增强聚合物复合材料 (NFRPC) 的回收利用仍存在挑战和机遇。本文总结了再加工/回收对 NFRPC 材料特性的影响。考虑的材料特性包括机械性能、热特性、吸湿行为、粘弹性、降解和耐久性。NFRPC 通常可以回收大约 4-6 次，直到它们的热机械性能发生变化。回收7次后，NFRPCs的拉伸强度可降低17%，拉伸模量可降低28%。还讨论了克服 NFRPC 材料性能退化的缓解方法，例如添加功能性添加剂和原生塑料。讨论了这些方法中的主要挑战，例如降解和不相容性，并努力为再加工/可回收性评估提供基本原理。讨论了 NFRPC 的未来应用，如增材制造和汽车零件使用。并努力为再处理/可回收性评估提供依据。讨论了 NFRPC 的未来应用，如增材制造和汽车零件使用。并努力为再处理/可回收性评估提供依据。讨论了 NFRPC 的未来应用，如增材制造和汽车零件使用。