All the produced binary systems maintained the optical trans-
parency of the PLA matrix, while the addition of PBS reduced
the transparency and the gloss, as consequence of high crys-
tallinity induced by the polymer. The presence of the surfactant on
the nanocrystal surface favoured their dispersion in the polymer
matrix. Data from mechanical tests confirmed the plasticization
effect induced by s-CNC, suggesting the possibility of modulating
mechanical properties according to application requests. The ten-
sile strength and modulus decreased with PBS content. Finally, the
migration levels for all the studied bionanocomposites, tested with
two food simulants, were maintained below the European legisla-
tive limits.