Resumo

PALMAY, Paúl; JARAMILLO-UVIDIA, Renee Nickole  e  MEDINA, Carlos. Estudio cinético de la descomposición térmica del polietileno de alta densidad (HDPE) posconsumo a diferentes tasas de calentamiento. Figempa [online]. 2021, vol.11, n.1, pp.61-67. ISSN 2602-8484.  https://doi.org/10.29166/revfig.v11i1.3132.

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 15 ºC min-1 heating rates, under nitrogen atmosphere at 20 mL min-1 and dynamic conditions from 25 to 900 ºC. 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 these models the activation energy were 281, 248 and 232 kJ kmol-1 for 5, 10 and 15º C min-1 heating rates respectively.

Palavras-chave : HDPE; kinetics; degradation; thermal decomposition.

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