【摘要】 研究了单股苎麻纤维（R1）和3股苎麻纤维（R3）这2种纱线结构对苎麻/聚乳酸（PLA）复合材料吸水老化的影响.结果表明：R1/PLA复合材料中，苎麻纤维分布较为均匀；老化前期，R1/PLA与R3/PLA复合材料的吸水行为大致相同，老化后期，R3/PLA复合材料的吸水率高于R1/PLA复合材料；随着老化的进行，2种复合材料中的纤维与基体界面处出现微裂纹，基体结晶度先升后降，R3/PLA复合材料的老化速率较快，其力学性能在老化后期低于R1/PLA复合材料.R1/PLA复合材料由于纤维具有良好的分散性，其耐久性能较好，可应用于建筑工程中.更多还原

【Abstract】 Effect of yarn structure on the aging of ramie fiber reinforced poly lactic acid(PLA) composites in water was investigated. The results show that ramie fibers have better dispersibility in R1/PLA composites than R3/PLA composites. There are more water absorption of R3/PLA composites compared with R1/PLA composites after aging. For both kinds of ramie/PLA composites, the interface between fiber and matrix became worse and the crystallinity of PLA is first increased and then decreased with the prolonged aging time. The R3/PLA composites has a faster aging rate, which leads to the lower mechanical properties than R1/PLA composite in late aging stage.The R1/PLA composites has better durability due to the good dispersion of the fibers, and can be used in construction work.更多还原