3.6. Differential scanning calorimetry (DSC) analysisThe DSC analysis was carried out in DSC-200 PC, NETZSCH,Germany, at isothermal conditions using 5–10 mg of sample at ascanning rate of 10◦C/min, under nitrogen atmosphere. The sam-ples were heated to 250◦C, held for 5 min for removing moistureand previous thermal history and then cooled to room temperatureat a cooling rate of 10◦C/min. The second heating run was done toobtain the Tg.