In this study, the aspect ratio values of CNCCr(NO3)3 are well above 10 (~15.7), which is considered the minimum value required for a good stress transfer from the matrix to the fiber for a good reinforcement when nano-biocomposite is targeted . Generally, it is known that to constitute the composites, nanocellulose structures with a higher aspect ratio have a good reinforcing capability of the final polymer products, resulting in an improvement in the thermal and mechanical properties . Besides the outstanding mechanical properties, another advantage of Cr(NO3)3-catalyzed hydrolysis over H2SO4 hydrolysis is that no sulfate groups were introduced to the surface of cellulose fibrils after the hydrolysis process.