Thermal properties of the copolymers during heating and cooling were investigated using differential scanning calorimetry (DSC) (DSC Q2500 Discovery, TA Instruments Inc., New Castle, DE, USA) applying heating-cooling-heating cycles. 20 mg of each sample were kept 24h in vacuum oven at 45°C and then placed into the aluminum pans. The selected temperature range was from -90 to 200°C, at 10°C /min of rate. The obtained results were collected as thermograms and analyzed via Trios software for reporting the glass transition temperature (Tg), changes in specific heat capacity (ΔCp), crystallization temperature (Tc), cold crystallization temperature (Tcc), melting temperature (Tm) and the melting enthalpy (ΔHm). The degree of crystallinity (Xc) was also determined by following equation ( ):