The glass transition temperature (Tg) was measured by using DSC
Q100 TA Instruments equipment with the following procedure:
samples were cooled to −80 °C at rate of 10 °C/min and kept at that
temperature for 2min. After this cooling step, the samples were heated
from −80 °C to 25 °C at a rate of 10 °C/min to obtain the Tg curves.