Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms

© 2017 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/).

Detalles Bibliográficos
Autores: Román Concha, Frida Rosario|||0000-0001-7435-2402, Colomer Vilanova, Pere, Calventus Solé, Yolanda|||0000-0002-6216-5420, Hutchinson, John M.|||0000-0003-0743-1260
Tipo de recurso: artículo
Fecha de publicación:2017
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:2117/104535
Acceso en línea:https://hdl.handle.net/2117/104535
https://dx.doi.org/10.3390/ma10020127
Access Level:acceso abierto
Palabra clave:Thermoplastics
Molecular dynamics
Dielectric relaxation spectroscopy (DRS)
Multiarm star polymers
Poly(lactide) (PLA)
Poly(ethyleneimine) (PEI)
Differential scanning calorimetry (DSC)
Termoplàstics
Dinàmica molecular
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
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spelling Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarmsRomán Concha, Frida Rosario|||0000-0001-7435-2402Colomer Vilanova, PereCalventus Solé, Yolanda|||0000-0002-6216-5420Hutchinson, John M.|||0000-0003-0743-1260ThermoplasticsMolecular dynamicsDielectric relaxation spectroscopy (DRS)Multiarm star polymersPoly(lactide) (PLA)Poly(ethyleneimine) (PEI)Differential scanning calorimetry (DSC)TermoplàsticsDinàmica molecularÀrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers© 2017 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/).Multiarm star polymers, denoted PEIx-PLAy and containing a hyperbranched poly(ethyleneimine) (PEI) core of different molecular weights x and poly(lactide) (PLA) arms with y ratio of lactide repeat units to N links were used in this work. Samples were preconditioned to remove the moisture content and then characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and dielectric relaxation spectroscopy (DRS). The glass transition temperature, Tg, is between 48 and 50 °C for all the PEIx-PLAy samples. The dielectric curves show four dipolar relaxations: γ, β, α, and α′ in order of increasing temperature. The temperatures at which these relaxations appear, together with their dependence on the frequency, allows relaxation maps to be drawn, from which the activation energies of the sub-Tg γ- and β-relaxations and the Vogel–Fulcher–Tammann parameters of the α-relaxation glass transition are obtained. The dependence of the characteristic features of these relaxations on the molecular weight of the PEI core and on the ratio of lactide repeat units to N links permits the assignation of molecular motions to each relaxation. The γ-relaxation is associated with local motions of the –OH groups of the poly(lactide) chains, the β-relaxation with motions of the main chain of poly(lactide), the α-relaxation with global motions of the complete assembly of PEI core and PLA arms, and the α′-relaxation is related to the normal mode relaxation due to fluctuations of the end-to-end vector in the PLA arms, without excluding the possibility that it could be a Maxwell–Wagner–Sillars type ionic peak because the material may have nano-regions of different conductivityPeer Reviewed20172017-02-0420172017-05-17journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/104535https://dx.doi.org/10.3390/ma10020127reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 3.0 Spainhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1045352026-05-27T15:37:01Z
dc.title.none.fl_str_mv Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms
title Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms
spellingShingle Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms
Román Concha, Frida Rosario|||0000-0001-7435-2402
Thermoplastics
Molecular dynamics
Dielectric relaxation spectroscopy (DRS)
Multiarm star polymers
Poly(lactide) (PLA)
Poly(ethyleneimine) (PEI)
Differential scanning calorimetry (DSC)
Termoplàstics
Dinàmica molecular
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
title_short Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms
title_full Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms
title_fullStr Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms
title_full_unstemmed Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms
title_sort Study of the molecular dynamics of multiarm star polymers with a poly(ethyleneimine) core and poly(lactide) multiarms
dc.creator.none.fl_str_mv Román Concha, Frida Rosario|||0000-0001-7435-2402
Colomer Vilanova, Pere
Calventus Solé, Yolanda|||0000-0002-6216-5420
Hutchinson, John M.|||0000-0003-0743-1260
author Román Concha, Frida Rosario|||0000-0001-7435-2402
author_facet Román Concha, Frida Rosario|||0000-0001-7435-2402
Colomer Vilanova, Pere
Calventus Solé, Yolanda|||0000-0002-6216-5420
Hutchinson, John M.|||0000-0003-0743-1260
author_role author
author2 Colomer Vilanova, Pere
Calventus Solé, Yolanda|||0000-0002-6216-5420
Hutchinson, John M.|||0000-0003-0743-1260
author2_role author
author
author
dc.subject.none.fl_str_mv Thermoplastics
Molecular dynamics
Dielectric relaxation spectroscopy (DRS)
Multiarm star polymers
Poly(lactide) (PLA)
Poly(ethyleneimine) (PEI)
Differential scanning calorimetry (DSC)
Termoplàstics
Dinàmica molecular
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
topic Thermoplastics
Molecular dynamics
Dielectric relaxation spectroscopy (DRS)
Multiarm star polymers
Poly(lactide) (PLA)
Poly(ethyleneimine) (PEI)
Differential scanning calorimetry (DSC)
Termoplàstics
Dinàmica molecular
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
description © 2017 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/).
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-02-04
2017
2017-05-17
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/104535
https://dx.doi.org/10.3390/ma10020127
url https://hdl.handle.net/2117/104535
https://dx.doi.org/10.3390/ma10020127
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 3.0 Spain
http://creativecommons.org/licenses/by/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 3.0 Spain
http://creativecommons.org/licenses/by/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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