文章将亚麻纤维布和聚乳酸（PLA）熔融共混，通过注塑成型的方法制成PLA/亚麻无纺布复合材料。探究了亚麻纤维添加量对复合材料力学性能、热学性能及降解性能的影响。结果表明：亚麻纤维的加入改善了PLA/亚麻无纺布可降解复合材料的力学性能、热学性能和储能模量，提升了复合材料的结晶度，增强了复合材料的降解性能。亚麻纤维含量为20%时，复合材料的拉伸强度、冲击强度和弯曲模量分别为66.0 MPa、5.52 kJ/m²和4.0 GPa，复合材料的结晶度达到13.89%，维卡软化温度为141.32 ℃，同时在降解第40 d时，添加20%亚麻纤维的复合材料的失重率达到最高，为12.03%。该研究结果为PLA/亚麻纤维复合材料的应用提供一定的数据支持。

Flax fiber cloth and polylactic acid (PLA) were melted and blended to produce PLA/flax non-woven fabric composites through injection molding. The effects of flax fiber addition on the mechanical properties, thermal properties, and degradation performance of composites were explored. The results show that the addition of flax fiber improves the mechanical properties, thermal properties, and energy storage modulus of PLA/flax nonwoven fabric degradable composites, enhances the crystallinity of the composites, and enhances the degradation performance of the composites. When the flax fiber content is 20%, the tensile strength, impact strength, and bending modulus of the composites are 66.0 MPa, 5.52 kJ/m², and 4.0 GPa, respectively. The crystallinity of the composites reaches 13.89%, and the Vicat softening temperature is 141.32 ℃. At the 40 d of degradation, the weight loss rate of the composite with the addition of 20% flax fiber reaches the highest, which is 12.03%. The research results provide data support for the application of PLA/flax fiber composites.