Analysis of Polyethylene Terephthalate by TG-FTIR

TG-FTIR is a relatively simple FTIR-coupled analytical technique in which the FTIR is coupled with a thermogravimetric analyzer (TG).
In TG-FTIR, while mass changes such as sample decomposition and vaporization that accompany changes in temperature are measured quantitatively by the TG, qualitative analysis of the evolved gases can be conducted simultaneously by FTIR measurement of the obtained spectra.

Fig.1 and Fig.2 show the TG and TG derivative curves (D-TG curve) of polyethylene terephthalate in nitrogen and air atmospheres, respectively, with heating conducted at 20 °C/min. In addition, the corresponding 3-dimensional IR spectra are shown in Fig.3 and Fig.4.