Abstract: Polylactic acid is very attractive in the field of biodegradable materials.However,due to the limitation of the molecular chain structure of PLA,its flexibility is poor and the material is brittle which make the PLA polymer unsuitable for many applications.The mechanical and thermal stability can be improved by reinforcing it with natural fibers. This paper reviewed the research status and new progress of natural fiber reinforced polylactic acid biodegradable composites in domestic and overseas,and discussed the properties,technical methods and potential applications of polylactic acid composites modified by animal fiber and plant fiber.In addition,this paper reviewed research progress of the degradation of PLA/plant fiber composites.The development prospects of PLA/natural fiber composite such as reducing the cost of PLA composite materials,improving the mechanical properties and the biodegradable properties, was also predicted.

Key words: polylactic acid, composite materials, natural fiber, mechanical properties, biodegradable

摘要： 聚乳酸（PLA）以其优异的生物降解性在可降解材料领域备受关注，然而其脆性、热稳定性以及相对较高的价格限制了其应用领域。采用天然纤维增强PLA复合材料是改善PLA力学及热稳定性能的有效途径之一。本文综述了国内外对天然纤维增强聚乳酸基可降解复合材料的研究现状及新进展，讨论了动物纤维、植物纤维改性聚乳酸复合材料的性能、技术方法及潜在应用领域。此外，论文综述了PLA/植物纤维复合材料降解的研究进展，展望了PLA/天然纤维复合材料在降低PLA复合材料成本、提高力学性能并保持生物降解性能等方面的发展前景。

关键词: 聚乳酸, 复合材料, 天然纤维, 力学性能, 可生物降解