TGA of the packaging materials was performed in a thermal
analyser Q5000IR (TA Instruments). The procedure was as follows:
approximately 6 mg samples were weighed, placed in a pan and
heated from room temperature to 900 C at a heating rate of
20 C min1 under an inert nitrogen atmosphere (flow rate
50 mL min1
), and then kept in isothermal conditions for 1 min.
Three different samples were analysed for each material.