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

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