Determination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions

In the present study, the thermodynamic parameters of Polylactic Acid (PLA) under conditions of thermal degradation were determined. The PLA material, previously sampled and characterized, was analyzed by dynamic thermogravimetry (TG) at heating rates of 5, 10 and 15 °C min<sup>−1</sup>...

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Autores principales:	Paul Palmay, Melissa Mora, Diego Barzallo, Joan Carles Bruno
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	thermodynamic parameters polylactic acid degradation temperature kinetic triplet Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/b4ffb7550854409fb79d0176c7150d3c
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spelling	oai:doaj.org-article:b4ffb7550854409fb79d0176c7150d3c2021-11-11T15:14:57ZDetermination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions10.3390/app1121101922076-3417https://doaj.org/article/b4ffb7550854409fb79d0176c7150d3c2021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10192https://doaj.org/toc/2076-3417In the present study, the thermodynamic parameters of Polylactic Acid (PLA) under conditions of thermal degradation were determined. The PLA material, previously sampled and characterized, was analyzed by dynamic thermogravimetry (TG) at heating rates of 5, 10 and 15 °C min<sup>−1</sup> with a nitrogen flow of 20 mL min<sup>−1</sup> from a temperature of 25 to 900 °C. The data were treated using isoconversional kinetic models to obtain the activation energy and the pre-exponential factor of each model. To fit the DTG curves, the Arrhenius equation was used applying the Contraction Sphere reaction model: two-dimensional phase limit reaction (R2). The thermodynamic parameters such as enthalpy, Gibbs free energy and entropy were determined from the kinetic parameters of suitable models for each heating rate after statistical validation and comparison with other studies. The results showed that as the heating rate increases, the degradation temperature also increases, while the activation energy, enthalpy and pre-exponential factor decrease. According to the value of ∆G (171.65 kJ mol<sup>−1</sup>), PLA has a significant potential to be used as a raw material to produce bioenergy/biofuels by pyrolysis.Paul PalmayMelissa MoraDiego BarzalloJoan Carles BrunoMDPI AGarticlethermodynamic parameterspolylactic aciddegradation temperaturekinetic tripletTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10192, p 10192 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermodynamic parameters polylactic acid degradation temperature kinetic triplet Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	thermodynamic parameters polylactic acid degradation temperature kinetic triplet Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Paul Palmay Melissa Mora Diego Barzallo Joan Carles Bruno Determination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions
description	In the present study, the thermodynamic parameters of Polylactic Acid (PLA) under conditions of thermal degradation were determined. The PLA material, previously sampled and characterized, was analyzed by dynamic thermogravimetry (TG) at heating rates of 5, 10 and 15 °C min<sup>−1</sup> with a nitrogen flow of 20 mL min<sup>−1</sup> from a temperature of 25 to 900 °C. The data were treated using isoconversional kinetic models to obtain the activation energy and the pre-exponential factor of each model. To fit the DTG curves, the Arrhenius equation was used applying the Contraction Sphere reaction model: two-dimensional phase limit reaction (R2). The thermodynamic parameters such as enthalpy, Gibbs free energy and entropy were determined from the kinetic parameters of suitable models for each heating rate after statistical validation and comparison with other studies. The results showed that as the heating rate increases, the degradation temperature also increases, while the activation energy, enthalpy and pre-exponential factor decrease. According to the value of ∆G (171.65 kJ mol<sup>−1</sup>), PLA has a significant potential to be used as a raw material to produce bioenergy/biofuels by pyrolysis.
format	article
author	Paul Palmay Melissa Mora Diego Barzallo Joan Carles Bruno
author_facet	Paul Palmay Melissa Mora Diego Barzallo Joan Carles Bruno
author_sort	Paul Palmay
title	Determination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions
title_short	Determination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions
title_full	Determination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions
title_fullStr	Determination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions
title_full_unstemmed	Determination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions
title_sort	determination of thermodynamic parameters of polylactic acid by thermogravimetry under pyrolysis conditions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b4ffb7550854409fb79d0176c7150d3c
work_keys_str_mv	AT paulpalmay determinationofthermodynamicparametersofpolylacticacidbythermogravimetryunderpyrolysisconditions AT melissamora determinationofthermodynamicparametersofpolylacticacidbythermogravimetryunderpyrolysisconditions AT diegobarzallo determinationofthermodynamicparametersofpolylacticacidbythermogravimetryunderpyrolysisconditions AT joancarlesbruno determinationofthermodynamicparametersofpolylacticacidbythermogravimetryunderpyrolysisconditions
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Determination of Thermodynamic Parameters of Polylactic Acid by Thermogravimetry under Pyrolysis Conditions

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