2.2.3. Thermal Analysis

Differential Scanning Calorimetric analysis (DSC) and Thermogravimetric Analysis (TGA) were performed with a Mettler Toledo mod. TGA/DSC1 calorimeter (Mettler Toledo, Barcelona, Spain). The TGA equipment sensor is a thermostatic microbalance with an accuracy of 0.1 μg, which is the limit established for weighing precision. On the other hand, the TGA/DSC1 has sensors that obtain the DSC signal directly and in real-time.

The TGA was performed in air using a heating rate of 10 ◦C/min in the 30–400 ◦C temperature range and the DSC runs were performed with a heating rate of 2 ◦C/min and nitrogen was used as a purge gas in DSC under the flow of 15 mL/min.

#### 2.2.4. Fourier Transform Infrared (FTIR) Spectroscopy

FTIR spectra were performed with the JASCO 6200 spectrophotometer (JASCO, Pfungstadt, Germany) which has an attenuated total reflectance (ATR) accessory. Measurements were performed in the range 4000–600 cm−<sup>1</sup> with a 0.5 cm−<sup>1</sup> resolution and a well-plate sampler. The results were analyzed using the Spectra Manager II software (Version 2, JASCO).
