Morphology and Mechanical Properties of Poly(ethylene brassylate)/Cellulose Nanocrystal composites

•Low CNC contents improve the mechanical properties of Poly(ethylene brassylate).•Adding 2.5 wt% CNCs increases Young modulus by 14% and elongation at break by 23%.•SEM images reveal the formation of a percolating network for the sonicated CNCs.•High CNC contents improve the Young modulus at the expense of ductility.