2.3. Thermal analysis
Thermogravimetric analysis (TGA) was carried out using a Mettler Toledo TGA/SDTA/851 thermal analyzer (Columbus OH, USA). The samples were heated from room temperature to 900 °C at 10 °C/min under a nitrogen atmosphere to analyse the evapouration of volatile compounds and the thermal degradation of the materials developed.
The glass transition temperature (Tg) and the melting temperature (Tm) and enthalpy (ΔHm) of the samples were also determined by differential scanning calorimetry with a Model Q2000 DSC from TA Instruments (New Castle, DE, USA). Materials were dried in a vacuum oven at 50 °C for two days to evaporate the residual solvent. Thermograms were obtained from −20 °C to 220 °C with 10 °C/min heating, cooling to −20 °C, and a second heating process to 220 °C. Considering the polymer percentage of each sample, a corrected enthalpy (ΔHmcor) value was also estimated.