TGA was performed on a Mettler Toledo TGA/DSC1. The samples were loaded into 70 µL alumina crucibles and heated from 30 to 600 °C at a heating rate of 10 °C min -1 under a constant nitrogen flow rate of 50 mL min -1 . The inorganic content was evaluated with a faster heating rate of 20 °C min -1 from 30 to 900 °C under a 50 mL min -1 oxygen flow rate. In both cases, duplicates were tested while an empty crucible provided a baseline.