Thermogravimetric analysis (TGA) was performed using a
PerkinElmer TGA7 in the temperature range of 50 and 800 ◦C,
under nitrogen or air atmosphere (60 mL/min) and a heating rate
of 10 ◦C/min. Differential scanning calorimetry (DSC) experiments
were performed using a TA Q20 instrument equipped with a refrigerant cooling system (RCS) in the temperature range of −90 to
150 ◦C, with a heating rate of 10 ◦C/min, under an anhydrous N2
atmosphere (60 mL/min). The cooling rates were fixed at 50 or
1 ◦C/min