Thermogravimetric (TGA) analysis was performed to evaluatethe thermal stabilities of composite films using a TGA 2950 running with the Universal Analysis Software package V.3.9a. Samples of approximately 5 mg wereheated from 50 to 500◦C at 10◦C/min heating rate under a nitrogenflow of 70 mL/min. Weight losses of samples were measured as afunction of temperature. TGA was run in duplicate