Thermogravimetric analysis (TGA) and differential thermogravimetry (DTG) were carried out with a Mettler Toledo thermogravimetric analyzer (TGA/SDTA 85-F) in a nitrogen atmosphere for each matrix and the optimum composite films from each set of treatments. The samples were heated from 25 ◦C to 600 ◦C at 10 ◦C min−1.