DC p [J/g•ᵒC] Based on DSC analysis, it was evident that PBA-DLA copolyesters exhibited a semicrystalline nature, characterized by distinct Tg, Tm, and Tc transitions. Focusing on the Tg values, they provide clear evidence of the successful integration of amorphous DLA segments within the rigid PBA matrix. Both copolyesters displayed similar Tg values, with slightly lower temperatures observed for the PBA-DLA_B copolyester (-61°C and -62°C for PBA-DLA_S and PBA-DLA_B, respectively). Furthermore, upon cooling the molten copolyester, the resulting crystalline morphologies exhibited a crystallization transition at 6 and 9°C for PBA-DLA_S and PBA-DLA_B, respectively. In the case of PBA-DLA_S, crystallization begins at lower temperature rates due to higher Mw values. Polymers with higher molecular weights tend to crystallize more slowly since larger molecules have more complex structures and are more difficult to arrange in an ordered pattern. Furthermore, referring to the crystallization degree, PBA-DLS_S copolymer possesses slightly higher Xc,h, and Xc,tot values than PBA-DLA_B which may be attributed to the differences in copolymer microstructure. PBA-DLA_S possesses a longer average sequence length of hard segments (LBDO-DA) which may result in more efficient formation of the crystalline phase due to stronger intra-and/or intermolecular interactions between rigid sequences. Obtained copolyesters are characterized by relatively low melting temperatures (40 and 42°C for PBA-DLA_S and PBA-DLA_B, respectively), and therefore, the range of possible applications is rather limited. However, they can be successfully used in other fields, for example in biomedical applications as drug nanocarriers as we demonstrated in our previous work .