In general, HCNCs reinforced the APCNs under different conditions. According to these results, samples between 6 and 15 wt% seem to provide the ideal balance of mechanical behavior, showing high stress-and strain-at-break, Young´s modulus, and toughness. Increasing the HCNC content to values higher than 22 wt% was not possible, as the CNCs did not disperse homogeneously.