Extraction and characterization of cellulose nanocrystals from corncob for application as reinforcing agent in nanocomposites

摘要: Abstract Corncob is an agro-industrial waste available in large quantities several countries, including Brazil, which deserves to be better and/or properly used. This work evaluates the use of corncob as a source cellulose obtain nanocrystals by acid hydrolysis order material suitable reinforcement agent manufacture nanocomposites. The was performed at 45 °C for 30, 60 and 90 min, using 15 mL H 2 SO 4 (9.17 M) each gram cellulose. resulting (CNC) were characterized crystallinity index, morphology thermal stability, their reinforcing capability evaluated polyvinyl alcohol (PVA) polymeric matrix. Among conditions carried out, extraction time 60 min resulted nanoparticles (CNC ) with larger capability. CNC endowed CNC/PVA composites significantly improved tensile strength 140.2% when only 9% (wt.%) incorporated. presented needle-shaped nature, high (83.7%), good stability (around 185 °C), average length ( L 210.8 ± 44.2 nm diameter D 4.15 ± 1.08 nm, giving aspect ratio / around 53.4 ± 15.8. results show that more filler . Since has highest among samples, but does not have ratio, these suggest difference index greater influence on properties than aspects this case. Cellulose obtained from great potential agents