This study aims at measuring the interfacial properties of natural fibers in polypropylene composites by the mean of direct methods of characterization. Bamboo lamellae (BL) and polypropylene (PP) were used to produce laminated composites with continuous and homogenous interfaces. This research also focuses on the effect of maleic anhydride-grafted PP (MAPP) on the improvement of the PP/BL composites interfacial properties, which were measured by the means of the double cantilever beam (DCB), end-notched flexure (ENF) and short beam shear (SBS) methods. Flexural properties of the different composites were also determined using the three-point bending and single cantilever modes by dynamic mechanical analysis (DMA). The retention rates (Rr) of mechanical and interfacial properties were calculated on samples aged in hot water. Results reveal that MAPP induced a significant increase in flexural properties. This is undeniably related to an enhancement of affinity between PP and BL that was confirmed by DCB, ENF and SBS tests results. It was also highlighted that MAPP tends to limit degradation of the composite interfacial properties with,for instance, a critical fracture toughness (mode I) Rr of 97 % for MAPP coated composites against 56 % for the untreated composites.

这项研究旨在通过直接表征方法来测量聚丙烯复合材料中天然纤维的界面性能。竹片（BL）和聚丙烯（PP）用于生产具有连续且均匀界面的层压复合材料。这项研究还侧重于马来酸酐接枝PP（MAPP）对改善PP / BL复合材料界面性能的影响，这是通过双悬臂梁（DCB），端部弯曲挠曲（ENF）进行测量的和短梁剪切（SBS）方法。还通过动态力学分析（DMA）使用三点弯曲和单悬臂模式确定了不同复合材料的弯曲性能。在热水中老化的样品上计算出机械和界面性能的保留率（Rr）。结果表明，MAPP导致弯曲性能显着提高。不可否认，这与DCB，ENF和SBS测试结果证实的PP和BL之间亲和力的提高有关。还强调指出，MAPP倾向于限制复合材料界面性能的下降，例如，MAPP涂层复合材料的临界断裂韧性（I型）Rr为97％，而未处理复合材料为56％。