Table shows the results of the mechanical tests, mainly Young modulus (YM), tensile strength (TS), and elongation at break (EB). It can be noticed that composites with pristine montmorillonite, as well as modified with limonene and its mixture with pinene, have slightly higher YM and TS values and lower EB that indicates the formation of strong interaction of the fillers with the polymer chains that inhibit their mobility. As shown in previous studies, the changes in Young's modulus determined in the static tensile test can be correlated with the storage modulus data determined by DMTA ). In the considered case, these results show a similar trend between both applied research methods. The reduction in EB observed in all cases results from introducing a separate phase into the polymer, constituting a point of stress accumulation during load . The drop of the EB value and increase of YM and TS are also affected by the intercalation of the additive in the PBS matrix. In the case of clay modified with limonene, there was no improvement in TS, which can indicate that limonene is less compatible with the PBS than pinene and forms weaker physical bonding that does not restrict chain mobility. This can also be found in DMTA results where lower G' and higher intensity of tanδ peak for PBS modified with MMT containing pinene were observed. Comparing the filler type, the most significant improvement of mechanical properties was obtained for PBS with the unmodified MMT (increase of TS and the lowest drop of EB values). . The parameter values for biocomposite are lower than for pure PBS film, and the filler type did not significantly affect the samples' oxygen permeability. The crystalline phases (Fig. ), which formed an obstacle to gas diffusion, affected low OTR values . The filler presence in the polymeric matrix limited gas transfer through the sample, creating barriers to gas migration through the material. Similar results were observed for PBS films with sodium and organophilized MMT (Cloisite 30B) obtained via compression molding .