Abstract
The thermal decompositions of poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT) were measured by a simultaneous TG-DTA/FT-IR system. Two kinds of data, FT-IR spectra and the specific gas profiles (SGP), were collected as a function of temperature, in addition to the TG-DTA data. Evolved gas analysis was carried out in terms of specific gas profiles (SGP) at the specific absorption band. Kinetic analysis was performed on both the TG and SGP curves obtained at various heating rates, and the activation energy estimated from the TG curves was in agreement with that obtained from the SGP curves of the aromatic esters of PBT. In the case of PET, the activation energy obtained from the TG curves was an average of that calculated from the SGP curves for the aromatic esters and carbon dioxide.
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