Measurements were performed on PBS films sealed in hermetic aluminum pans using a differential scanning calorimeter (TA Instruments DSC Q2500 Discovery) in the heating-cooling-heating cycles with the standard heating/cooling rate of 10 °C/min. The measurements were conducted in the temperature range of -50 to 250 °C under a nitrogen atmosphere. The glass transition temperature (Tg) values were taken as an onset point of the transition during a second heating stage. The melting temperature (Tm) and the crystallization temperature (Tc) were determined as the maximum of the endothermic (for melting) or exothermic (for crystallization) peaks of the diffractograms.