Differential scanning calorimetry (DSC) was performed using a TA Instruments Discovery DSC 25. Approximately 10 mg of polymers were placed in sealed aluminum capsules and analyzed under nitrogen flow (50 mL min -1 ). A three-step procedure with a ramp of 10 °C min -1 was applied as follows: (i) heating from 90 to 200 °C to erase the thermal history, (ii) cooling to 90 °C (iii) heating from 90 to 200 °C. The glass transition temperature (Tg) and Tm are determined during the second heating step.