Show simple item record

dc.contributor.authorDiego Vives, José Antonio
dc.contributor.authorSellarès González, Jordi
dc.contributor.authorDíez Berart, Sergio
dc.contributor.authorSalud Puig, Josep
dc.contributor.authorCañadas Lorenzo, Juan Carlos
dc.contributor.authorMudarra López, Miguel
dc.contributor.authorLópez Pérez, David Orencio
dc.contributor.authorde la Fuente Lavin, Maria Rosario
dc.contributor.authorRos, M Blanca
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.date.accessioned2017-07-14T09:36:40Z
dc.date.available2018-04-11T00:30:25Z
dc.date.issued2017-04-11
dc.identifier.citationDiego, J., Sellarès, J., Diez, S., Salud, J., Cañadas, J.C., Mudarra, M., Lopez, D., de la Fuente, M., Ros, M. Influence of internal flexibility on the double glass transition in a series of odd non-symmetric liquid crystal dimers characterised by dielectric measurements. "Liquid crystals", 11 Abril 2017, vol. 44, núm. 6, p. 1007-1022.
dc.identifier.issn0267-8292
dc.identifier.urihttp://hdl.handle.net/2117/106422
dc.description.abstractDielectric measurements (thermally stimulated depolarisation currents and broadband dielectric spectroscopy) have been performed near the glass transition to study the glass transition on the odd non-symmetric liquid crystal (LC) dimers of the series -(4-cyanobiphenyl-4'-oxy)--(1-pyreniminebenzylidene-4'-oxy) alkanes (CBOnO.Py) with n ranging from 3 to 9. A previous study [S. Diez-Berart et al., Materials 8 (2015) 3334] carried out in CBO11O.Py showed the presence of two glass transition temperatures, attributed to different molecular motions of the terminal groups. The study performed allows us to analyse the molecular dynamics in the rest of the series and determine the role played by the flexible spacer. Parallel and perpendicular orientations of the molecular director with regards to the probe electric field have been investigated. The low and intermediate observed relaxations are explained in the framework of Stocchero's theoretical model [M. Stocchero, J. Chem. Phys. 121 (2004) 8079] for the dielectric behaviour of non-symmetric LCs dimers, as independent end-over-end rotations of each terminal semi-rigid unit. As the length of the spacer chain in the series of compounds decreases, the different relaxations become progressively more coupled at the glass transition. Numerical simulations of the calorimetric response from the obtained kinetic parameters show good agreement with experimental behaviour.
dc.format.extent16 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::Física::Física de l'estat sòlid
dc.subject.lcshDielectrics
dc.subject.lcshSolid state physics
dc.subject.lcshSolid state electronics
dc.subject.otherDimers
dc.subject.otherGlass transition
dc.subject.otherThermally stimulated discharge currents
dc.subject.otherTool-Narayanaswamy-Moynihan model
dc.subject.otherRelaxation time
dc.subject.otherBroadband dielectric spectroscopy
dc.subject.otherDifferential scanning calorimetry
dc.titleInfluence of internal flexibility on the double glass transition in a series of odd non-symmetric liquid crystal dimers characterised by dielectric measurements
dc.typeArticle
dc.subject.lemacDielèctrics
dc.subject.lemacFísica de l'estat sòlid
dc.subject.lemacElectrònica de l'estat sòlid
dc.contributor.groupUniversitat Politècnica de Catalunya. DILAB - Laboratori de física dels materials dielèctrics
dc.contributor.groupUniversitat Politècnica de Catalunya. GRPFM - Grup de Recerca en Propietats Físiques dels Materials
dc.identifier.doi10.1080/02678292.2017.1309099
dc.relation.publisherversionhttp://www.tandfonline.com/doi/full/10.1080/02678292.2017.1309099
dc.rights.accessOpen Access
drac.iddocument21144606
dc.description.versionPostprint (author's final draft)
upcommons.citation.authorDiego, J., Sellarès, J., Diez, S., Salud, J., Cañadas, J.C., Mudarra, M., Lopez, D., de la Fuente, M., Ros, M.
upcommons.citation.publishedtrue
upcommons.citation.publicationNameLiquid crystals
upcommons.citation.volume44
upcommons.citation.number6
upcommons.citation.startingPage1007
upcommons.citation.endingPage1022


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

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