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Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior

This work reports the effect of the addition of an oligomer of lactic acid (OLA), in the 5–20 wt% range, on the processing and properties of polylactide (PLA) pieces prepared by injection molding. The obtained results suggested that the here-tested OLA mainly performs as an impact modifier for PLA,...

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Autores principales: Lascano, Diego, Moraga, Giovanni, Ivorra-Martinez, Juan, Rojas-Lema, Sandra, Torres-Giner, Sergio, Balart, Rafael, Boronat, Teodomiro, Quiles-Carrillo, Luis
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6960981/
https://www.ncbi.nlm.nih.gov/pubmed/31847359
http://dx.doi.org/10.3390/polym11122099
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author Lascano, Diego
Moraga, Giovanni
Ivorra-Martinez, Juan
Rojas-Lema, Sandra
Torres-Giner, Sergio
Balart, Rafael
Boronat, Teodomiro
Quiles-Carrillo, Luis
author_facet Lascano, Diego
Moraga, Giovanni
Ivorra-Martinez, Juan
Rojas-Lema, Sandra
Torres-Giner, Sergio
Balart, Rafael
Boronat, Teodomiro
Quiles-Carrillo, Luis
author_sort Lascano, Diego
collection PubMed
description This work reports the effect of the addition of an oligomer of lactic acid (OLA), in the 5–20 wt% range, on the processing and properties of polylactide (PLA) pieces prepared by injection molding. The obtained results suggested that the here-tested OLA mainly performs as an impact modifier for PLA, showing a percentage increase in the impact strength of approximately 171% for the injection-molded pieces containing 15 wt% OLA. A slight plasticization was observed by the decrease of the glass transition temperature (T(g)) of PLA of up to 12.5 °C. The OLA addition also promoted a reduction of the cold crystallization temperature (T(cc)) of more than 10 °C due to an increased motion of the biopolymer chains and the potential nucleating effect of the short oligomer chains. Moreover, the shape memory behavior of the PLA samples was characterized by flexural tests with different deformation angles, that is, 15°, 30°, 60°, and 90°. The obtained results confirmed the extraordinary effect of OLA on the shape memory recovery (R(r)) of PLA, which increased linearly as the OLA loading increased. In particular, the OLA-containing PLA samples were able to successfully recover over 95% of their original shape for low deformation angles, while they still reached nearly 70% of recovery for the highest angles. Therefore, the present OLA can be successfully used as a novel additive to improve the toughness and shape memory behavior of compostable packaging articles based on PLA in the new frame of the Circular Economy.
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spelling pubmed-69609812020-01-24 Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior Lascano, Diego Moraga, Giovanni Ivorra-Martinez, Juan Rojas-Lema, Sandra Torres-Giner, Sergio Balart, Rafael Boronat, Teodomiro Quiles-Carrillo, Luis Polymers (Basel) Article This work reports the effect of the addition of an oligomer of lactic acid (OLA), in the 5–20 wt% range, on the processing and properties of polylactide (PLA) pieces prepared by injection molding. The obtained results suggested that the here-tested OLA mainly performs as an impact modifier for PLA, showing a percentage increase in the impact strength of approximately 171% for the injection-molded pieces containing 15 wt% OLA. A slight plasticization was observed by the decrease of the glass transition temperature (T(g)) of PLA of up to 12.5 °C. The OLA addition also promoted a reduction of the cold crystallization temperature (T(cc)) of more than 10 °C due to an increased motion of the biopolymer chains and the potential nucleating effect of the short oligomer chains. Moreover, the shape memory behavior of the PLA samples was characterized by flexural tests with different deformation angles, that is, 15°, 30°, 60°, and 90°. The obtained results confirmed the extraordinary effect of OLA on the shape memory recovery (R(r)) of PLA, which increased linearly as the OLA loading increased. In particular, the OLA-containing PLA samples were able to successfully recover over 95% of their original shape for low deformation angles, while they still reached nearly 70% of recovery for the highest angles. Therefore, the present OLA can be successfully used as a novel additive to improve the toughness and shape memory behavior of compostable packaging articles based on PLA in the new frame of the Circular Economy. MDPI 2019-12-14 /pmc/articles/PMC6960981/ /pubmed/31847359 http://dx.doi.org/10.3390/polym11122099 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lascano, Diego
Moraga, Giovanni
Ivorra-Martinez, Juan
Rojas-Lema, Sandra
Torres-Giner, Sergio
Balart, Rafael
Boronat, Teodomiro
Quiles-Carrillo, Luis
Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior
title Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior
title_full Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior
title_fullStr Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior
title_full_unstemmed Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior
title_short Development of Injection-Molded Polylactide Pieces with High Toughness by the Addition of Lactic Acid Oligomer and Characterization of Their Shape Memory Behavior
title_sort development of injection-molded polylactide pieces with high toughness by the addition of lactic acid oligomer and characterization of their shape memory behavior
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6960981/
https://www.ncbi.nlm.nih.gov/pubmed/31847359
http://dx.doi.org/10.3390/polym11122099
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