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dc.contributor.authorDíaz Andrade, Angélica María
dc.contributor.authorBacaicoa, Anna
dc.contributor.authorCasas, Maria Teresa
dc.contributor.authorFranco García, María Lourdes
dc.contributor.authorSerra Albet, Àngels
dc.contributor.authorPuiggalí Bellalta, Jordi
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2015-06-04T09:23:31Z
dc.date.available2017-05-10T00:30:30Z
dc.date.created2015-05-10
dc.date.issued2015-05-10
dc.identifier.citationDiaz, A. [et al.]. Study on the crystallization of multiarm stars with a poly(ethyleneimine) core and poly(epsilon-caprolactone) arms of different length. "Thermochimica acta", 10 Maig 2015, vol. 607, p. 39-52.
dc.identifier.issn0040-6031
dc.identifier.urihttp://hdl.handle.net/2117/28176
dc.description.abstractCrystallization of multiarm star systems constituted by a core of poly(ethyleneimine) (PEI) and arms of poly(epsilon-caprolactone) (PCL) was studied by transmission electron microscopy, calorimetry and optical microscopy techniques. Three systems differing on the degree of polymerization of PCL were studied as well as binary mixtures constituted by systems differing on the length of PCL arms. Samples were able to crystallize from both diluted solutions and the melt state giving rise to well-formed lamellae and spherulites, respectively. Lamellae of samples with large PCL arms were highly regular and corresponded to elongated hexagonal crystals with an aspect ratio that decreased with the length of PCL arms.; A significant decrease on equilibrium melting temperatures, degree of crystallinity and glass transition temperature was detected for samples having short PCL arms. Crystallization kinetics were also highly influenced by the length of PCL arms, being both nucleation density and secondary nucleation constant increased as the length of PCL arms decreased. Crystallization of star mixtures having different PCL lengths was determined by the larger arms since they initiated the process and subsequently shorter arms were progressively incorporated. A thermal nucleation was characteristic of multiarm star mixtures due to the different crystallization temperature ranges of samples with large and short PCL arms, whereas samples with a homogeneous arm length rendered an athermal nucleation. (C) 2015 Elsevier B.V. All rights reserved.
dc.format.extent14 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria química
dc.subject.lcshPolymers
dc.subject.lcshCrystallization
dc.subject.otherMultiarm stars
dc.subject.otherPoly(epsilon-caprolactone)
dc.subject.otherPoly(ethyleneimine)
dc.subject.otherCrystallization kinetics
dc.subject.otherLamellar crystals
dc.subject.otherPOLY-EPSILON-CAPROLACTONE
dc.subject.otherEQUILIBRIUM MELTING TEMPERATURE
dc.subject.otherBISPHENOL-A THERMOSETS
dc.subject.otherCRYSTAL-STRUCTURE
dc.subject.otherSEQUENTIAL POLYMERIZATION
dc.subject.otherHYPERBRANCHED POLYESTERS
dc.subject.otherENZYMATIC DEGRADATION
dc.subject.otherBRANCHED POLYESTERS
dc.subject.otherSINGLE-CRYSTALS
dc.subject.otherEPOXY-RESIN
dc.titleStudy on the crystallization of multiarm stars with a poly(ethyleneimine) core and poly(epsilon-caprolactone) arms of different length
dc.typeArticle
dc.subject.lemacPolímers
dc.subject.lemacCristal·lització
dc.contributor.groupUniversitat Politècnica de Catalunya. PSEP - Polimers Sintètics: Estructura i Propietats. Polimers Biodegradables.
dc.identifier.doi10.1016/j.tca.2015.03.010
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0040603115000921
dc.rights.accessOpen Access
local.identifier.drac15830486
dc.description.versionPostprint (author’s final draft)
local.citation.authorDiaz, A.; Bacaicoa, A.; Casas, M.; Franco, M.; Serra, À.; Puiggali, J.
local.citation.publicationNameThermochimica acta
local.citation.volume607
local.citation.startingPage39
local.citation.endingPage52


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Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain