Results and discussion
3.1. Mechanical properties of the materials
Typical stress–strain curves for the TPS/CNF films are
shown in Fig. 3, and the results obtained from the tensile
testing are summarized in Table 1. From Table 1 it can
be seen that the strength of the thermoplastic starch films
increased with the addition of cellulose nanofibers. The
strength increased with the cellulose nanofiber content
up to 10 wt.% of CNF, but the higher nanofiber concentrations
did not increase the strength significantly. The reason