Kinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends

Poly(lactic acid) (PLA) and biosourced polyamide (PA) bioblends, with a variable PA weight content of 10–50%, were prepared by melt blending in order to overcome the high brittleness of PLA. During processing, the properties of the melt were stabilized and enhanced by the addition of a styrene-acryl...

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Autores principales:	Félix Carrasco, Orlando Santana Pérez, Maria Lluïsa Maspoch
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	PLA PA bioblend thermal stability kinetic models reaction mechanisms Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/8e3fede98fe24c9c8c31a8776565f13d
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spelling	oai:doaj.org-article:8e3fede98fe24c9c8c31a8776565f13d2021-11-25T18:49:13ZKinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends10.3390/polym132239962073-4360https://doaj.org/article/8e3fede98fe24c9c8c31a8776565f13d2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/22/3996https://doaj.org/toc/2073-4360Poly(lactic acid) (PLA) and biosourced polyamide (PA) bioblends, with a variable PA weight content of 10–50%, were prepared by melt blending in order to overcome the high brittleness of PLA. During processing, the properties of the melt were stabilized and enhanced by the addition of a styrene-acrylic multi-functional-epoxide oligomeric reactive agent (SAmfE). The general analytical equation (GAE) was used to evaluate the kinetic parameters of the thermal degradation of PLA within bioblends. Various empirical and theoretical solid-state mechanisms were tested to find the best kinetic model. In order to study the effect of PA on the PLA matrix, only the first stage of the thermal degradation was taken into consideration in the kinetic analysis (<i>α</i> < 0.4). On the other hand, standardized conversion functions were evaluated. Given that it is not easy to visualize the best accordance between experimental and theoretical values of standardized conversion functions, an index, based on the integral mean error, was evaluated to quantitatively support our findings relative to the best reaction mechanism. It was demonstrated that the most probable mechanism for the thermal degradation of PLA is the random scission of macromolecular chains. Moreover, <i>y</i>(<i>α</i>) master plots, which are independent of activation energy values, were used to confirm that the selected reaction mechanism was the most adequate. Activation energy values were calculated as a function of PA content. Moreover, the onset thermal stability of PLA was also determined.Félix CarrascoOrlando Santana PérezMaria Lluïsa MaspochMDPI AGarticlePLAPAbioblendthermal stabilitykinetic modelsreaction mechanismsOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3996, p 3996 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	PLA PA bioblend thermal stability kinetic models reaction mechanisms Organic chemistry QD241-441
spellingShingle	PLA PA bioblend thermal stability kinetic models reaction mechanisms Organic chemistry QD241-441 Félix Carrasco Orlando Santana Pérez Maria Lluïsa Maspoch Kinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends
description	Poly(lactic acid) (PLA) and biosourced polyamide (PA) bioblends, with a variable PA weight content of 10–50%, were prepared by melt blending in order to overcome the high brittleness of PLA. During processing, the properties of the melt were stabilized and enhanced by the addition of a styrene-acrylic multi-functional-epoxide oligomeric reactive agent (SAmfE). The general analytical equation (GAE) was used to evaluate the kinetic parameters of the thermal degradation of PLA within bioblends. Various empirical and theoretical solid-state mechanisms were tested to find the best kinetic model. In order to study the effect of PA on the PLA matrix, only the first stage of the thermal degradation was taken into consideration in the kinetic analysis (<i>α</i> < 0.4). On the other hand, standardized conversion functions were evaluated. Given that it is not easy to visualize the best accordance between experimental and theoretical values of standardized conversion functions, an index, based on the integral mean error, was evaluated to quantitatively support our findings relative to the best reaction mechanism. It was demonstrated that the most probable mechanism for the thermal degradation of PLA is the random scission of macromolecular chains. Moreover, <i>y</i>(<i>α</i>) master plots, which are independent of activation energy values, were used to confirm that the selected reaction mechanism was the most adequate. Activation energy values were calculated as a function of PA content. Moreover, the onset thermal stability of PLA was also determined.
format	article
author	Félix Carrasco Orlando Santana Pérez Maria Lluïsa Maspoch
author_facet	Félix Carrasco Orlando Santana Pérez Maria Lluïsa Maspoch
author_sort	Félix Carrasco
title	Kinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends
title_short	Kinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends
title_full	Kinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends
title_fullStr	Kinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends
title_full_unstemmed	Kinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends
title_sort	kinetics of the thermal degradation of poly(lactic acid) and polyamide bioblends
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8e3fede98fe24c9c8c31a8776565f13d
work_keys_str_mv	AT felixcarrasco kineticsofthethermaldegradationofpolylacticacidandpolyamidebioblends AT orlandosantanaperez kineticsofthethermaldegradationofpolylacticacidandpolyamidebioblends AT marialluisamaspoch kineticsofthethermaldegradationofpolylacticacidandpolyamidebioblends
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Kinetics of the Thermal Degradation of Poly(lactic acid) and Polyamide Bioblends

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