Example of TMA Data
Glass Expansion Measurement
With a TMA, the thermal expansion coefficient and the glass transition temperature of a sample can be measured. The TMA curve when glass is heated is shown above. It can be seen that the expansion coefficient changes abruptly near 560 °C. This indicates that the glass transition has occurred. After this, the TMA curve changes abruptly near 620 °C. This is because the sample softens.
Tensile Measurements of a PET Film
The PET film is heated while elongating the sample with a 5 g load. Contraction of the sample is seen near 200 °C. This is because the PET film, which was stretched when molded, returns to its original state because of the heat. The switch from contraction to elongation occurs at 240 °C. This is attributed to melting. The sample breaks after abrupt elongation immediately afterward.