2.5.4. Mechanical Properties

Tensile test was performed to evaluate the mechanical properties of the prepared ChNF–CNF composites by using a tensile test machine [35]. Specimens were cut to the size of 0.5 <sup>×</sup> 5 cm2. The length between grips was 3 cm. The specimen thickness was varied from 40 to 45 μm. Dried samples were kept in a condition chamber (30% RH and 25 ◦C) for at least 8 h before the tensile test, and five specimens were tested for each case. The ChNF specimen was prepared by casting it and tested also for comparison.
