Two series of segmented copolymers were synthesized by two-step process involving transesterification and polycondensation in the melt as already described in . Briefly, in the first step, dimethyl succinate, 1,4-butanediol, and a magnesium/titanium butoxide catalyst (Mg-Ti-BuO) in amount of 0.06 g per 100 g of DMS were added to the reactor and the temperature was increased to 200°C until the theoretical amount of condensate (methanol) was collected. Dimethyl succinate and 1,4-butanediol were transesterified to form butylene succinate hard segments. In the second step, the components of the soft segments were added to the reactor, including DLA-OH and PEG (molecular weight of 6000 g/mol) and the second portion of the Mg-Ti-BuO catalyst in amount of 0.06 g per 100 g of DMS. The temperature was then raised to 240°C and the pressure was reduced to 0.2-0.4 mbar. The progress of the polycondensation was monitored by observing the increase in copolymer melt viscosity with increasing power consumption by the stirrer. After about 140 minutes, the reaction was complete, and the resulting copolymer was extracted into the water bath as filament. Two series of copolymers were synthesized with the theoretical weight ratio of PBS to DLS set at 70-30 wt.% and 60-40 wt.%, respectively, and the PEG component was added at 5 wt.%.