The incorporation of PEG into copolymer remarkably impacts the specific heat capacity, so that in the material with 60 wt.% hard segments content, PEG's contribution resulted in a drastic decrease of the specific heat capacity from 0.52 J/g°C to 0.22 J/g°C. It's important to note that the PBS-DLS 60-40 material, which contains a higher amount of soft segments, underwent cold crystallization during the heating at around 4°C, and for PBS-DLS-PEG copolymers, this temperature shifted down to 2°C. This phenomenon occurs by the existence of amorphous fraction in semi-crystalline polymers and results in an easily and broadly tunable crystallinity, including cold crystallization . It is also evidence for the amorphous phase degradation, therefore for the material containing PEG, the peak intensity remarkably decreased. The next significant change in thermal characteristic of the copolymers after degradation was observed in increasing the crystallization temperature, Tc (Figure ). In PBS-DLS copolymers with 70 wt.% hard segments, the crystallization temperature shifted from 28 °C to around 49.7 °C after the degradation for 20 days. A similar trend was found for PBS-DLS-PEG 70-25-5 indicating a shift from 31.5 °C to 52.8 °C, while in the copolymer with 60 wt.% of hard segments, this change was only from 17 °C to 19.3 °C. In semi-crystalline polymers, the enzyme catalyzed degradation initially takes place in the amorphous phase and then leading to hydrolysis of the crystalline phase and breaking down the long macromolecular chains , .