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Scalable Continuous Manufacturing Process of Stereocomplex PLA by Twin-Screw Extrusion

A scalable continuous manufacturing method to produce stereocomplex PLA was developed and optimized by melt-blending a 1:1 blend of high molecular weight poly(L-lactide) (PLLA) and high molecular weight poly(D-lactide) (PDLA) in a co-rotating twin-screw extruder. Thermal characteristics of stereocom...

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Detalles Bibliográficos
Autores principales: Alhaj, Mohammed, Narayan, Ramani
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9965968/
https://www.ncbi.nlm.nih.gov/pubmed/36850205
http://dx.doi.org/10.3390/polym15040922
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author Alhaj, Mohammed
Narayan, Ramani
author_facet Alhaj, Mohammed
Narayan, Ramani
author_sort Alhaj, Mohammed
collection PubMed
description A scalable continuous manufacturing method to produce stereocomplex PLA was developed and optimized by melt-blending a 1:1 blend of high molecular weight poly(L-lactide) (PLLA) and high molecular weight poly(D-lactide) (PDLA) in a co-rotating twin-screw extruder. Thermal characteristics of stereocomplex formation were characterized via DSC to identify the optimal temperature profile and time for processing stereocomplex PLA. At the proper temperature window, high stereocomplex formation is achieved as the twin-screw extruder allows for alignment of the chains; this is due to stretching of the polymer chains in the extruder. The extruder processing conditions were optimized and used to produce >95% of stereocomplex PLA conversion (melting peak temperature T(pm) = 240 °C). ATR-FTIR depicts the formation of stereocomplex crystallites based on the absorption band at 908 cm(−1) (β helix). The only peaks observed for stereocomplex PLA’s WAXD profile were at 2θ values of 12, 21, and 24°, verifying >99% of stereocomplex formation. The total crystallinity of stereocomplex PLA ranges from 56 to 64%. A significant improvement in the tensile behavior was observed in comparison to the homopolymers, resulting in a polymer of high strength and toughness. These results lead us to propose stereocomplex PLA as a potential additive/fiber that can reinforce the material properties of neat PLA.
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spelling pubmed-99659682023-02-26 Scalable Continuous Manufacturing Process of Stereocomplex PLA by Twin-Screw Extrusion Alhaj, Mohammed Narayan, Ramani Polymers (Basel) Article A scalable continuous manufacturing method to produce stereocomplex PLA was developed and optimized by melt-blending a 1:1 blend of high molecular weight poly(L-lactide) (PLLA) and high molecular weight poly(D-lactide) (PDLA) in a co-rotating twin-screw extruder. Thermal characteristics of stereocomplex formation were characterized via DSC to identify the optimal temperature profile and time for processing stereocomplex PLA. At the proper temperature window, high stereocomplex formation is achieved as the twin-screw extruder allows for alignment of the chains; this is due to stretching of the polymer chains in the extruder. The extruder processing conditions were optimized and used to produce >95% of stereocomplex PLA conversion (melting peak temperature T(pm) = 240 °C). ATR-FTIR depicts the formation of stereocomplex crystallites based on the absorption band at 908 cm(−1) (β helix). The only peaks observed for stereocomplex PLA’s WAXD profile were at 2θ values of 12, 21, and 24°, verifying >99% of stereocomplex formation. The total crystallinity of stereocomplex PLA ranges from 56 to 64%. A significant improvement in the tensile behavior was observed in comparison to the homopolymers, resulting in a polymer of high strength and toughness. These results lead us to propose stereocomplex PLA as a potential additive/fiber that can reinforce the material properties of neat PLA. MDPI 2023-02-12 /pmc/articles/PMC9965968/ /pubmed/36850205 http://dx.doi.org/10.3390/polym15040922 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Alhaj, Mohammed
Narayan, Ramani
Scalable Continuous Manufacturing Process of Stereocomplex PLA by Twin-Screw Extrusion
title Scalable Continuous Manufacturing Process of Stereocomplex PLA by Twin-Screw Extrusion
title_full Scalable Continuous Manufacturing Process of Stereocomplex PLA by Twin-Screw Extrusion
title_fullStr Scalable Continuous Manufacturing Process of Stereocomplex PLA by Twin-Screw Extrusion
title_full_unstemmed Scalable Continuous Manufacturing Process of Stereocomplex PLA by Twin-Screw Extrusion
title_short Scalable Continuous Manufacturing Process of Stereocomplex PLA by Twin-Screw Extrusion
title_sort scalable continuous manufacturing process of stereocomplex pla by twin-screw extrusion
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9965968/
https://www.ncbi.nlm.nih.gov/pubmed/36850205
http://dx.doi.org/10.3390/polym15040922
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