**4.3.3 Thermogravimetry Analysis (TGA)**

TGA is a versatile thermal study in polymer field. It is primarily used to determine thermal stability and thermal degradation of the samples as a function of change in temperature under inert conditions. The main principle of TGA is to monitor the weight of the samples on a sensitive balance (also known as thermobalance) continuously as the sample temperature is increased, under an inert atmosphere or air at a controlled uniform rate. The data were recorded as a thermogram of weight which is in y–axis against sample temperature which is in x–axis.

The thermal stability of polymer films was performed by Mettler Toledo Thermal Gravimetric Analyser which comprised of TGA/SDTA851@ as main unit and STARe software. Sample weighing 2–3 mg placed into 150 μl of silica crucible. The samples were then heated from 30 °C to 400 °C at a heating rate of 10 °C min-1 under nitrogen flow rate of 10 ml min-1.
