Critical examination of chemically modified hybrid thermosets: Synthesis, characterization and mechanical behavior in the plateau regime of polyaminosiloxane-nitrile-DGEBA

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dc.contributor.author Loayza Argüelles, Artemia
dc.contributor.author Cabanelas Valcárcel, Juan Carlos
dc.contributor.author Gonzalez Gonzalez, Maria
dc.contributor.author Baselga Llidó, Juan
dc.date.accessioned 2017-11-29T12:54:59Z
dc.date.available 2017-11-29T12:54:59Z
dc.date.issued 2015-07-09
dc.identifier.bibliographicCitation Loayza, A., Cabanelas, J. C., González, M. G. & Baselga, J. (2015). Critical examination of chemically modified hybrid thermosets: Synthesis, characterization and mechanical behavior in the plateau regime of polyaminosiloxane-nitrile-DGEBA. Polymer, 69, pp. 178-185.
dc.identifier.issn 0032-3861
dc.identifier.uri http://hdl.handle.net/10016/26005
dc.description.abstract Poly(3-aminopropylmethylsiloxane) has been modified with acrylonitrile via aza Michael addition and a broad range of modified oligomers have been prepared with CN:NH₂ ratio ranging between 0.1 and 1. NMR and FTnIR analysis reveals that acrylonitrile modification proceeds without formation of tertiary amines. Modified oligomers have been characterized by DSC and analysis of Tg reveals that the adducts are self-associated probably due to weak hydrogen bonding and dipole interactions. The modified oligomers with a modification degree higher than 0.4 were miscible with DGEBA. The low and high temperature relaxations of the cured thermosets have been measured by DMTA. In addition to the commonly observed β₂ relaxation, a new β₁ process linked by an isosbestic point to β₂ has been found. β₁ is attributed to an extended segment comprising the pendant propionitrile group as well as the aminopropyl segment that connects tertiary amines to the polysiloxane backbone. Elastic modulus as well as the α relaxation can be tuned from high Tg and high rubbery modulus to low Tg and high damping thermosets changing the nitrile content. The experimental network structure obtained from elastic measurements and the Tg were related through well established structure-property relations.
dc.description.sponsorship Authors wish to thank Spanish Ministerio de Economía y Competitividad for funding this work under grant MAT2010-17091.
dc.format.extent 8
dc.format.mimetype application/pdf
dc.language.iso spa
dc.publisher Elsevier
dc.rights © Elsevier, 2015
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Epoxy resins
dc.subject.other Hybrid thermoset
dc.subject.other Polysiloxane
dc.title Critical examination of chemically modified hybrid thermosets: Synthesis, characterization and mechanical behavior in the plateau regime of polyaminosiloxane-nitrile-DGEBA
dc.type article
dc.subject.eciencia Materiales
dc.subject.eciencia Química
dc.identifier.doi https://doi.org/10.1016/j.polymer.2015.05.054
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. MAT2010-17091
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 178
dc.identifier.publicationlastpage 185
dc.identifier.publicationtitle Polymer
dc.identifier.publicationvolume 69
dc.identifier.uxxi AR/0000017129
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