Despite the academic interest in using plant fibres as reinforcement in polymer composites to replace glass fibres, the industrial exploitation of resulting composites in semi- or structural applications is still limited. This is mainly due to the poor adhesion at the plant fibre/polymer matrix interface dictated by their surface chemistry and strong hydrophilic behaviour. In the present work, an assessment of the interfacial adhesion at the yarn scale has been carried out. Fragmentation tests have been performed on flax/epoxy and flax/vinylester single yarn composites. High-resolution microtomography has allowed a 3-D reconstruction of the breaking area of the flax yarn. The flax/epoxy system has shown the lowest values of critical fragment length and interfacial debonding length, and the highest values of IFSS. For both epoxy and vinylester samples, it was found that the breakage of flax has been mainly concentrated in the peripheral zone of the yarn.

尽管在将植物纤维用作聚合物复合材料中的增强材料以代替玻璃纤维方面有学术兴趣，但是在半或结构应用中所得复合材料的工业开发仍然受到限制。这主要是由于它们的表面化学性质和强烈的亲水性所决定的，它们在植物纤维/聚合物基质界面处的粘合性很差。在目前的工作中，已经进行了在纱线规模上的界面粘合性的评估。已经对亚麻/环氧树脂和亚麻/乙烯基酯单纱复合材料进行了破碎测试。高分辨率显微断层摄影术可以对亚麻纱线的断头区域进行3D重建。亚麻/环氧树脂系统显示出临界片段长度和界面脱胶长度的最小值，而IFSS的最大值。