Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation

The influence of temperature on the formation of high molecular weight poly(lactic acid) (PLA) stereocomplex was studied by evaluation of the precipitates from dioxane solutions of PLA enantiomers (PLLA and PDLA). The racemic mixtures were characterized by Gel Permeation Chromatography, Infrared Spe...

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Detalles Bibliográficos
Autores: Hortos Llobera, Martí, Espino, Sebastian, Bou Serra, Jordi|||0000-0001-7948-8720
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/128556
Acceso en línea:https://hdl.handle.net/2117/128556
https://dx.doi.org/10.3144/expresspolymlett.2019.12
Access Level:acceso abierto
Palabra clave:Polymers--Biodegradation
Biodegradable polymers
polylactide
polymeric racemic mixture
crystal growing
capillary rheometry
Polímers -- Biodegradació
Àrees temàtiques de la UPC::Enginyeria química
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oai_identifier_str oai:upcommons.upc.edu:2117/128556
network_acronym_str ES
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repository_id_str
spelling Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formationHortos Llobera, MartíEspino, SebastianBou Serra, Jordi|||0000-0001-7948-8720Polymers--BiodegradationBiodegradable polymerspolylactidepolymeric racemic mixturecrystal growingcapillary rheometryPolímers -- BiodegradacióÀrees temàtiques de la UPC::Enginyeria químicaThe influence of temperature on the formation of high molecular weight poly(lactic acid) (PLA) stereocomplex was studied by evaluation of the precipitates from dioxane solutions of PLA enantiomers (PLLA and PDLA). The racemic mixtures were characterized by Gel Permeation Chromatography, Infrared Spectroscopy, Differential Scanning Calorimetry, Scanning Electronic Microscopy, Wide-Angle X-ray Scattering and Vicat Softening Temperature. Precipitation was carried out under different solution temperatures, keeping constant the mixing ratio (XD), the molecular weight, the optical purity of both PLA enantiomers and the stirring rate. It was found that the precipitates contained only pure stereocomplex crystallites (racemic crystallites), without observing crystal phase separation between both homocrystals. The kinetics of the insoluble phase formation could be adjusted with the Avrami model, classically used for polymer crystallization in molten state. It was observed that the maximum PLA stereocomplex production rate was at about 40°C. However, more thermally stable racemic crystallites were formed at high solution temperatures. It was found that all the precipitates were sphere-like at 10 g·dl–1 at the solution temperature of 25, 40, 60 and 80°CPeer Reviewed20192019-02-0120192019-02-06journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/128556https://dx.doi.org/10.3144/expresspolymlett.2019.12reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1285562026-05-27T15:37:01Z
dc.title.none.fl_str_mv Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation
title Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation
spellingShingle Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation
Hortos Llobera, Martí
Polymers--Biodegradation
Biodegradable polymers
polylactide
polymeric racemic mixture
crystal growing
capillary rheometry
Polímers -- Biodegradació
Àrees temàtiques de la UPC::Enginyeria química
title_short Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation
title_full Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation
title_fullStr Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation
title_full_unstemmed Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation
title_sort Influence of temperature on high molecular weight poly(lactic acid) stereocomplex formation
dc.creator.none.fl_str_mv Hortos Llobera, Martí
Espino, Sebastian
Bou Serra, Jordi|||0000-0001-7948-8720
author Hortos Llobera, Martí
author_facet Hortos Llobera, Martí
Espino, Sebastian
Bou Serra, Jordi|||0000-0001-7948-8720
author_role author
author2 Espino, Sebastian
Bou Serra, Jordi|||0000-0001-7948-8720
author2_role author
author
dc.subject.none.fl_str_mv Polymers--Biodegradation
Biodegradable polymers
polylactide
polymeric racemic mixture
crystal growing
capillary rheometry
Polímers -- Biodegradació
Àrees temàtiques de la UPC::Enginyeria química
topic Polymers--Biodegradation
Biodegradable polymers
polylactide
polymeric racemic mixture
crystal growing
capillary rheometry
Polímers -- Biodegradació
Àrees temàtiques de la UPC::Enginyeria química
description The influence of temperature on the formation of high molecular weight poly(lactic acid) (PLA) stereocomplex was studied by evaluation of the precipitates from dioxane solutions of PLA enantiomers (PLLA and PDLA). The racemic mixtures were characterized by Gel Permeation Chromatography, Infrared Spectroscopy, Differential Scanning Calorimetry, Scanning Electronic Microscopy, Wide-Angle X-ray Scattering and Vicat Softening Temperature. Precipitation was carried out under different solution temperatures, keeping constant the mixing ratio (XD), the molecular weight, the optical purity of both PLA enantiomers and the stirring rate. It was found that the precipitates contained only pure stereocomplex crystallites (racemic crystallites), without observing crystal phase separation between both homocrystals. The kinetics of the insoluble phase formation could be adjusted with the Avrami model, classically used for polymer crystallization in molten state. It was observed that the maximum PLA stereocomplex production rate was at about 40°C. However, more thermally stable racemic crystallites were formed at high solution temperatures. It was found that all the precipitates were sphere-like at 10 g·dl–1 at the solution temperature of 25, 40, 60 and 80°C
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-02-01
2019
2019-02-06
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/128556
https://dx.doi.org/10.3144/expresspolymlett.2019.12
url https://hdl.handle.net/2117/128556
https://dx.doi.org/10.3144/expresspolymlett.2019.12
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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