| Abstract:The morphology and structure of plant fibers determine their properties, which have a significant impact on the pulp and paper making process as well as the performance of the finished paper. There are significant differences in the morphology and structure of different hemp fibers. This study focused on four types of hemp fibers: Ananas comosus, Cannabis sativa, Corchorus capsularis, and Agave sisalana. The basic morphology, anatomical structure, surface morphology, cell wall structure, microfibril angle, and microcrystalline structure characteristics were studied. The results showed that the four types of hemp fibers have a high aspect ratio, and there are significant differences in the morphology of different hemp fibers; Among the anatomical structures of the four types of hemp fibers, the Corchorus capsularis phloem fiber group is distributed in clusters, while the Corchorus capsularis phloem fiber group is distributed in a radial pattern. The leaf fibers of Ananas comosus and Agave sisalana both exist at the periphery of vascular bundles; Under electron microscopy, the surfaces of the four types of hemp fibers are relatively rough, and the arrangement of primary wall microfibrils is irregular. Among them, the surface wrinkles of Corchorus capsularis fibers are the most dense; All four types of hemp fibers have obvious multi walled structures, among which the cell wall structure of sisal fibers is the most compact; The microfibril angles of Corchorus capsularis and Corchorus capsularis bast hemp fibers are relatively small at 6.61° and 7.67°, respectively, while the microfibril angles of Ananas comosus and Agave sisalana leaf hemp fibers are 16.29° and 20.84°, respectively; The crystallinity of hemp and pineapple fibers is both above 80%, while the particle size of sisal and Corchorus capsularis fibers is smaller than 3 nm. |