This work proposes a multi-scale study of the properties of leaf sheath date palm fibres currently considered as agricultural waste. Firstly, by using optical and electronic microscopy, two main types of bundles were identified which have profoundly different structures. Biochemical analysis and X-ray diffraction (XRD) revealed a low degree of crystallinity but a significant lignin content of about 17% giving the bundles a very cohesive structure as well as a good thermal stability in addition to a singular behaviour in dynamic vapour sorption. An average cell wall stiffness in the order of 16 GPa was highlighted by Atomic Force Microscopy in mechanical mode but tensile tests on bundles have revealed low stiffness and strength but a high elongation. These results combined with the cellular structure of these bundles, provides the potential of these wastes as cost effective and environmentally friendly composite reinforcements for high energy absorption and improved acoustics functions.

这项工作提出了对目前被认为是农业废弃物的叶鞘枣椰子纤维特性的多尺度研究。首先，通过光学和电子显微镜，发现了两种主要类型的束，它们的结构截然不同。生化分析和X射线衍射（XRD）显示出较低的结晶度，但木质素含量约为17％，使束具有非常紧密的内聚力结构，并具有良好的热稳定性，并且在动态蒸气吸附方面具有奇异的行为。原子力显微镜在机械模式下突出显示了平均细胞壁刚度约为16 GPa，但对纤维束的拉伸试验却显示出较低的刚度和强度，但伸长率却很高。这些结果与这些束的细胞结构相结合，