Kinetic study of the thermal decomposition of high density polyethylene (hdpe) post consumption at different heating rates
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Abstract
The thermal degradation of the post-consumer high-density polyethylene (HDPE) to determine the chemical kinetics is the objective of this research. It was developed through thermogravimetric analysis (TGA) at 5, 10 and 15º C min-1 heating rates, under nitrogen atmosphere at 20 mL min-1 and dynamic conditions from 25 to 900º C. The degradation process data (mass vs time) and the first derivative were obtained from that data and were applied in three isoconversional kinetic models to determine the activation energy: Friedman (FR), Kissinger–Akahira–Sunose (KAS) and Flynn–Wall–Ozawa (FWO), in addition to the reaction model known as Sphere of Contraction (R2). All the described models fit well for the thermoplastics treatment, however, the models that best describe the degradation kinetics for HDPE are the KAS and FWO models, in this models the activation energy were 281, 248 and 232 kJ kmol-1 for 5, 10 and 15º C min-1 heating rates respectively.
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