*2.4. ChNF–CNF Composites Preparation*

To prepare the composites, the CNF was used as a matrix and ChNF was blended to reinforce the composites. The blended suspensions were mixed by using the homogenizer (IKA 25) for 10 min at 10,000 rpm. The mixture was then cast on a polycarbonate substrate by using a doctor blade in a clean room and left to dry on air. The weight percent of ChNF was changed to 3%, 5%, 7%, 10%, 15% and 20%, and the composites were named as CTS3, CTS5, CTS7, CTS10, CTS15 and CTS20, respectively. The thickness of the prepared ChNF–CNF composites was between 40 and 45 μm.
