Show simple item record

dc.contributor.authorMudarra López, Miguel
dc.contributor.authorSellarès González, Jordi
dc.contributor.authorCañadas Lorenzo, Juan Carlos
dc.contributor.authorDiego Vives, José Antonio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationMudarra, M., Sellarès, J., Cañadas, J.C., Diego, J. Sublinear dispersive conductivity in polyetherimides by the electric modulus formalism. "IEEE Transactions on dielectrics and electrical insulation", Desembre 2015, vol. 22, núm. 6, p. 3327-3333.
dc.description(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
dc.description.abstractTwo commercially available polyetherimides, Ultem 1000 and Ultem 5000, have been studied by means of Dynamic Electrical Analysis. Results show that at temperatures above the glass transition dielectric response is highly influenced by space charge. Obtained data is analyzed using the electric modulus formalism. The real part of the conductivity is conveniently described by a sublinear power law dependency (¿n with n<;1), as Argand plots reveal, associated with correlated hopping of carriers. The imaginary part of the electric modulus shows a peak at low frequencies related to conduction processes. The modelisation of this peak allows us to obtain the dependence of the conductivity (s0), the fractional exponent (n) and the crossover frequency (¿p) on the temperature, among other parameters. The a relaxation, which appears at higher frequencies, has also to be modeled since it overlaps the conductivity relaxation. The study of the parameters in terms of the temperature allows us to identify the ones that are thermally activated. The difference between the conductivity relaxation time and the Maxwell relaxation time indicates the presence of deep traps. The coupling model points out that the correlation of the ionic motion diminishes with temperature, probably due to increasing disorder associated with thermal agitation.
dc.format.extent7 p.
dc.subjectÀrees temàtiques de la UPC::Física::Física de l'estat sòlid
dc.subject.lcshElectric conductivity
dc.subject.otherelectric modulus
dc.subject.othercorrelated hopping
dc.subject.otherbroadband dielectric spectroscopy
dc.titleSublinear dispersive conductivity in polyetherimides by the electric modulus formalism
dc.subject.lemacConductivitat elèctrica
dc.contributor.groupUniversitat Politècnica de Catalunya. DILAB - Laboratori de física dels materials dielèctrics
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
upcommons.citation.authorMudarra, M., Sellarès, J., Cañadas, J.C., Diego, J.
upcommons.citation.publicationNameIEEE Transactions on dielectrics and electrical insulation

Files in this item


This item appears in the following Collection(s)

Show simple item record

All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder