shows the morphological, mechanical and thermal characterization of PLA PBS blends with different content of PBS: 10, 20and 30 wt% respect to PLA.The fractured surfaces (cross-sections)of PLA and PLA PBS blends were investigated by FESEM (Fig. 2a) to evaluate the influence of different ratio of PBS in the PLA matrix.Arelatively smooth fractured surface was observed for the PLA film,while PLA PBS formulations exhibit a typical morphology of this polymeric combination, as it is possible to observe a phase separation in PLA PBS blends with the typical formation of nodules induced by the presence of PBS as previously observed in the literature (Bhatia et al., 2007; Persenaire et al., 2014). The dimensionof nodules increases with PBS content in PLA matrix, as well identified in PLA 30PBS film. Nevertheless, the PLA 20PBS formulation is characterized by smaller and better dispersed PBS nodules than PLA 10PBS and PLA 30PBS films. Fig. 2b shows the tensile strength and the elongation at break of PLA and PLA PBS formulations. Theincorporation of PBS causes the reduction in tensile strength, as already observed by Bhatia et al. (2007) and Persenaire et al. (2014) and an increase in deformation at break up to PBS content of 20 wt%.The reduction of the elongation at break in PLA 30PBS film could be due to low miscibility of both polymers as observed by FESEM investigation. The inclusion of PBS particles affects the materialresistance due to the presence of discontinuities, which weakenthe cohesion of the matrix and reduce its mechanical performance.The thermal behaviour of PLA and PLA PBS formulations was evaluated by DSC to study the effects of different ratio of PBS on the PLA thermal properties. The obtained curves are reported in Fig. 2c and the results are also summarized in Table 1. PLA films show only one melting peak while PLA PBS films show two melting peaks(see Fig. 2b), indicating that each polymeric component crystallizes individually and the polymeric blends are immiscible (Bhatiaet al., 2007). The first melting peak around 111 ◦C is present onlyin PLA PBS formulations and the enthalpy values increase with increasing content of PBS into PLA matrix. Moreover, the enthalpy associated with the second melting peak decreases with increasing contents of PBS, with values ranging from 25 to 24, 23 and 20 (J g−1) for PLA, PLA 10PBS, PLA 20PBS and PLA 30PBS, respectively. The cold crystallization of neat PLA is centred around 98 ◦Cand, in the case of PLA PBS formulations, the cold crystallization is shifted to lower temperature as a consequence of blending. Nevertheless, the cold crystallization of PLA corresponds with the melting peaks of PBS and this phenomenon hinders the visualization of cold crystallization peak of PLA into the PLA PBS films.