The results of rheological measurements performed in the strain-sweep experiment mode in the form of changes in storage (G') and loss (G") modulus as a function of strain are provided in Figure . For all series, the G" values were higher than G', which confirms the dominant viscous behavior of the molten PBS composites. The introduction of all types of fillers reduced the linear viscoelasticity (LVE) range observed during the strain sweep experiment. This is an expected effect of the limitation of macromolecule mobility caused by interactions between the polymer and the dispersed filler in the matrix or the formation of clusters of the rigid filler particles in polymer melt . In the case of angular frequency sweep experiments (Fig. ), it can be observed that the introduction of M, M-P, and M-L did not change the nature of the complex viscosity curves compared to unmodified PBS. This probably indicates the good dispersion of the filler or the development of agglomerated micrometric structures of the nano-sized fillers dispersed in the polymeric matrix. These curves show a Newtonian plateau in the range of small angular frequencies. The complex viscosity curve of PBS/M-PL is characterized by an increase in viscosity in the range of small angular frequencies, which is a characteristic effect for systems containing rigid filler structures forming a 3D-hindered network of non-melting domains remaining in physical contact, partially cross-linked or highly branched polymers . The lack of dependence between G' and angular frequency (ω) observed on the G' (ω) curve in the range up to 0.1 rad/s for PBS/M-PL, may be interpreted as a confirmation of reaching the rheological threshold of percolation by the filler in the polymer PBS/M-PL. Those data align with the previously mentioned possible intercalation of modified MMT by the polymer.