Cellulosic material from coffee husk has not been previously studied despite being a potential source of reinforcing agents for different applications. This material has been extracted and characterised from coffee husk, in parallel with previously studied rice husk. Samples have been analysed as to their ability to obtain cellulosic fibres and cellulose nanocrystals (CNC) by applying alkali and bleaching treatments and final sulphuric acid hydrolysis. Microstructural changes were analysed after treatments, and the size and aspect ratio of CNCs were determined. Crystallinity and thermal stability of both materials progressed in line with the enrichment in cellulosic compounds. The CNC aspect ratio was higher than 10, which confers good reinforcing properties. These were tested in thermoplastic starch films, whose elastic modulus increased by 186 and 121% when 1 wt% of CNCs from rice and coffee husks, respectively, was incorporated into the matrix. Coffee husk represents an interesting source of cellulosic reinforcing materials.

尽管咖啡皮中的纤维素材料是用于不同应用的增强剂的潜在来源，但之前尚未进行过研究。该材料是从咖啡果皮中提取和表征的，与之前研究过的米果皮平行。通过对样品进行碱和漂白处理以及最终的硫酸水解，分析了样品获得纤维素纤维和纤维素纳米晶体（CNC）的能力。处理后分析显微组织变化，并确定CNC的大小和纵横比。两种材料的结晶度和热稳定性与纤维素化合物的富集一致。CNC长宽比高于10，具有良好的增强性能。这些在热塑性淀粉薄膜中进行了测试，当分别将1％（重量）的稻壳和咖啡果壳中的CNCs掺入基质中时，其弹性模量分别增加186和121％。咖啡果壳代表了纤维素增强材料的一种有趣来源。