One of the main drawbacks of PBS compared to other better known aliphatic polyesters is its poor mechanical properties including the high brittleness. In order to extend its applicability, many modifications have been developed, including blending, copolymerisation with suitable monomeric units and composite formulation . One of the most widely studied PBS-based blends are PLA/PBS systems . The studies included in these works indicate an increase in mechanical parameters (tensile modulus, tensile strength) in proportion to the increase in PLA content in the system with a concomitant loss of ductility. Several PBS-based copolymers have also been reported in the literature. Very often these are multi-block copolymers containing, in addition to PBS, the so-called soft segments such as saturated dilinoleic acid (DLA) or dilinoleic succinate (DLS) . Increasing the amount of soft segments in the copolymer improves the flexibility of the polymer chains, which is reflected in the properties of the material. To date, many more complex systems have been developed, such as PBS-DLS-PEG, which allows the modification of properties such as hydrophilicity (thanks to the introduction of the poly(ethylene glycol) (PEG) segment) .