去壳
微晶纤维素
纤维素
纤维素乙醇
结晶度
淀粉
材料科学
热稳定性
复合材料
热塑性塑料
制浆造纸工业
化学
食品科学
有机化学
植物
生物
工程类
作者
Sofía Collazo‐Bigliardi,Rodrigo Ortega‐Toro,Amparo Chiralt
标识
DOI:10.1016/j.carbpol.2018.03.022
摘要
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.
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