Differential scanning calorimetry (DSC) analysis was performed
on samples with a mass ranging between 5 and 7 mg. The tests
were carried out by means of a Mettler Toledo DSC 822 under nitrogen
atmosphere. The samples were heated from 25 C to 200 C
at 10 C/min and kept at 200 C for 5 min to clear the previous
thermal history. After that, the samples were cooled to 25 C at
10 C/min. Finally, a second heating scanwas carried out by heating
the samples from 25 C to 200 C at 10 C/min.