Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications

This paper presents an alternative for enhancing the durability of poly (L-lactide) (PLLA) by racemic nucleation following stereo-complexation with a selected poly (D-lactide) (PLDA). The compounds are obtained by melt blending of a PLLA grade, previously designed for 3D printing but with a low heat...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Doina Dimonie, Silvia Mathe, Manuela Maria Iftime, Daniela Ionita, Roxana Trusca, Sorina Iftimie
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	PLA stereo-complexing racemic nucleation functional properties filament 3D printing Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/a41984f7e8774ab39bd638ad357e0022
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:a41984f7e8774ab39bd638ad357e0022
record_format	dspace
spelling	oai:doaj.org-article:a41984f7e8774ab39bd638ad357e00222021-11-11T18:10:15ZModulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications10.3390/ma142166501996-1944https://doaj.org/article/a41984f7e8774ab39bd638ad357e00222021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6650https://doaj.org/toc/1996-1944This paper presents an alternative for enhancing the durability of poly (L-lactide) (PLLA) by racemic nucleation following stereo-complexation with a selected poly (D-lactide) (PLDA). The compounds are obtained by melt blending of a PLLA grade, previously designed for 3D printing but with a low heat deflection temperature and impact resistance, with grades of PLDA differing in their molecular weight (Mw), D-lactide content (DS) and concentration. Our method considered how to reveal the racemic nucleation caused by stereo-complexation and its influence on functional properties. The FTIR study we performed showed that, depending on Mw, DS and concentration of the stereo-complexer (PDLA) used, bigger or smaller spectral changes can occur. The stereo-complexation was confirmed by the DSC analysis and, for the selected compound, by the POM, SEM, AFM microscopies, functional property and shapeability as 3D printing filaments. All the obtained results sustain the idea that, if a PLLA with M<sub>w</sub> of 4.5 × 10<sup>4</sup> g·mol<sup>−1</sup> is modified with PDLA with a medium M<sub>w</sub> of 11.6 × 10<sup>4</sup> g·mol<sup>−1</sup>, medium DS of 4% and 1% concentration, a racemic nucleation is possible. It produces a racemic polylactic acid (PDLLA) with improved durability and good shapeability as 3D printing filaments. These results are explicable if the dependence of the intermolecular interactions appears between the PLLA and stereo-complexer PDLA. To enlarge the durable applicability of racemic polylactic acid (PDLLA), future research should identify other parameters controling the PLA stereo-complexing as the intensifying the mobility of the macromolecules, the finding of the optimal recemic cristalization window.Doina DimonieSilvia MatheManuela Maria IftimeDaniela IonitaRoxana TruscaSorina IftimieMDPI AGarticlePLAstereo-complexingracemic nucleationfunctional propertiesfilament3D printingTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6650, p 6650 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	PLA stereo-complexing racemic nucleation functional properties filament 3D printing Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	PLA stereo-complexing racemic nucleation functional properties filament 3D printing Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Doina Dimonie Silvia Mathe Manuela Maria Iftime Daniela Ionita Roxana Trusca Sorina Iftimie Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications
description	This paper presents an alternative for enhancing the durability of poly (L-lactide) (PLLA) by racemic nucleation following stereo-complexation with a selected poly (D-lactide) (PLDA). The compounds are obtained by melt blending of a PLLA grade, previously designed for 3D printing but with a low heat deflection temperature and impact resistance, with grades of PLDA differing in their molecular weight (Mw), D-lactide content (DS) and concentration. Our method considered how to reveal the racemic nucleation caused by stereo-complexation and its influence on functional properties. The FTIR study we performed showed that, depending on Mw, DS and concentration of the stereo-complexer (PDLA) used, bigger or smaller spectral changes can occur. The stereo-complexation was confirmed by the DSC analysis and, for the selected compound, by the POM, SEM, AFM microscopies, functional property and shapeability as 3D printing filaments. All the obtained results sustain the idea that, if a PLLA with M<sub>w</sub> of 4.5 × 10<sup>4</sup> g·mol<sup>−1</sup> is modified with PDLA with a medium M<sub>w</sub> of 11.6 × 10<sup>4</sup> g·mol<sup>−1</sup>, medium DS of 4% and 1% concentration, a racemic nucleation is possible. It produces a racemic polylactic acid (PDLLA) with improved durability and good shapeability as 3D printing filaments. These results are explicable if the dependence of the intermolecular interactions appears between the PLLA and stereo-complexer PDLA. To enlarge the durable applicability of racemic polylactic acid (PDLLA), future research should identify other parameters controling the PLA stereo-complexing as the intensifying the mobility of the macromolecules, the finding of the optimal recemic cristalization window.
format	article
author	Doina Dimonie Silvia Mathe Manuela Maria Iftime Daniela Ionita Roxana Trusca Sorina Iftimie
author_facet	Doina Dimonie Silvia Mathe Manuela Maria Iftime Daniela Ionita Roxana Trusca Sorina Iftimie
author_sort	Doina Dimonie
title	Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications
title_short	Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications
title_full	Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications
title_fullStr	Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications
title_full_unstemmed	Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications
title_sort	modulation of the plla morphology through racemic nucleation to reach functional properties required by 3d printed durable applications
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/a41984f7e8774ab39bd638ad357e0022
work_keys_str_mv	AT doinadimonie modulationofthepllamorphologythroughracemicnucleationtoreachfunctionalpropertiesrequiredby3dprinteddurableapplications AT silviamathe modulationofthepllamorphologythroughracemicnucleationtoreachfunctionalpropertiesrequiredby3dprinteddurableapplications AT manuelamariaiftime modulationofthepllamorphologythroughracemicnucleationtoreachfunctionalpropertiesrequiredby3dprinteddurableapplications AT danielaionita modulationofthepllamorphologythroughracemicnucleationtoreachfunctionalpropertiesrequiredby3dprinteddurableapplications AT roxanatrusca modulationofthepllamorphologythroughracemicnucleationtoreachfunctionalpropertiesrequiredby3dprinteddurableapplications AT sorinaiftimie modulationofthepllamorphologythroughracemicnucleationtoreachfunctionalpropertiesrequiredby3dprinteddurableapplications
_version_	1718431902478630912

Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications

Ejemplares similares