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Relaxation dynamics of poly(vinylidene fluoride) studied by dynamical mechanical measurements and dielectric spectroscopy

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Relaxation dynamics of poly(vinylidene fluoride) studied by dynamical mechanical measurements and dielectric spectroscopy

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dc.contributor.author Sencadas, V. es_ES
dc.contributor.author Lanceros-Mendez, S. es_ES
dc.contributor.author Sabater i Serra, Roser es_ES
dc.contributor.author Andrio Balado, A. es_ES
dc.contributor.author Gómez Ribelles, José Luís es_ES
dc.date.accessioned 2020-10-15T03:31:36Z
dc.date.available 2020-10-15T03:31:36Z
dc.date.issued 2012-05 es_ES
dc.identifier.issn 1292-8941 es_ES
dc.identifier.uri http://hdl.handle.net/10251/151880
dc.description.abstract [EN] The aim of this study is to analyze the mobility of polymer chains in semicrystalline poly(vinylidene fluoride) (PVDF). PVDF crystallizes from the melt in the crystalline phase. The transformation from the phase to the electroactive phase can be induced by stretching at temperatures in the range between 80 and 140 ◦C. The spherulitic structure of the crystalline phase is deformed during stretching to form fibrils oriented in the direction of the strain. The amorphous phase confined among the crystalline lamellae is distorted as well and some degree of orientation of the polymer chains is expected. Dynamicmechanical and dielectric spectroscopy measurements were performed in PVDF films stretched to strain ratios up to 5 at temperatures between 80 and 140 ◦C. Dynamic-mechanical measurements were conducted between −60 ◦C and melting and in this temperature range the relaxation spectra show the main relaxation of the amorphous phase (called -relaxation) and at higher temperatures a relaxation related to crystallites motions (c-relaxation). Although the mean relaxation times of the -relaxation are nearly equal in PVDF before and after crystal phase transformation, a significant change of shape of the relaxation spectrum proves the effect of chain distortion due to crystal reorganization. In stretched PVDF the elastic modulus of the polymer in the direction of deformation is significantly higher than in the transversal one, as expected by chain and crystals fibril orientation. The recovery of the deformation when the sample is heated is related with the appearance of the c-relaxation. Dielectric spectroscopy spectrum shows the main relaxation of the amorphous phase and a secondary process (-relaxation) at lower temperatures. Stretching produces significant changes in the relaxation processes, mainly in the strength and shape of the main relaxation. The Havriliak-Negami function has been applied to analyze the dielectric response. es_ES
dc.description.sponsorship This work is funded by FEDER funds through the "Programa Operacional Factores de Competitividade-COMPETE" and by national funds by FCT-Fundacao para a Ciencia e Tecnologia, project references NANO/NMed-SD/0156/2007, PTDC/CTM/69316/2006 and PTDC/CTM-NAN/112574/2009. V. S. thanks the FCT for the SFRH/BPD/63148/2009 grant. JLGR acknowledges the support of the Spanish Ministry of Science and Innovation through MAT2010-21611-C03-01 (including the FEDER financial support), and EUI2008-00126 projects and funding in the Centro de Investigacion Principe Felipe in the field of Regenerative Medicine through the collaboration agreement from the Conselleria de Sanidad (Generalitat Valenciana), and the Instituto de Salud Carlos III (Ministry of Science and Innovation). The authors also acknowledge support from the COST Action MP1003, 2010 "European Scientific Network for Artificial Muscles". es_ES
dc.language Inglés es_ES
dc.publisher SPRINGER es_ES
dc.relation.ispartof The European Physical Journal E es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Beta-Pvdf Films es_ES
dc.subject Temperature-Dependence es_ES
dc.subject Crystalline Polymers es_ES
dc.subject Glass-Transition es_ES
dc.subject Uniaxial Stretch es_ES
dc.subject Alpha-Phase es_ES
dc.subject Behavior es_ES
dc.subject Transformation es_ES
dc.subject Polyethylene es_ES
dc.subject Viscosity es_ES
dc.subject.classification INGENIERIA ELECTRICA es_ES
dc.subject.classification MAQUINAS Y MOTORES TERMICOS es_ES
dc.title Relaxation dynamics of poly(vinylidene fluoride) studied by dynamical mechanical measurements and dielectric spectroscopy es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1140/epje/i2012-12041-x es_ES
dc.relation.projectID info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F63148%2F2009/PT/ELECTROACTIVE MATERIALS BASED POROUS MEMBRANES AND SCAFFOLDS FOR BIOMEDICAL APPLICATIONS/
dc.relation.projectID info:eu-repo/grantAgreement/COST//MP1003/EU/European Scientific Network for Artificial Muscles (ESNAM)/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/FCT/5876-PPCDTI/112574/PT/PROTSENSOR - A novel pressure sensor network system for static and dynamic measurement. Application to the limb/prosthesis pressure mapping./
dc.relation.projectID info:eu-repo/grantAgreement/MICINN//EUI2008-00126/ES/SMART JOINT IMPLANTS USING BIONANOCOMPOSITES/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/MICINN//MAT2010-21611-C03-01/ES/MATERIALES BIOESTABLES Y BIOREABSORBIBLES A LARGO PLAZO COMO SOPORTES MACROPOROSOS PARA LA REGENERACION DEL CARTILAGO ARTICULAR/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/FCT/5876-PPCDTI/69316/PT/Multiferroic, magnetoelectric and metallic micro and nanocomposites based on electroactive polymers for advanced applications/
dc.relation.projectID info:eu-repo/grantAgreement/FCT/5876-PPCDTI/109368/PT/“Smart joint implants using bionanocomposites-(SIMBIO)”/
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Eléctrica - Departament d'Enginyeria Elèctrica es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada es_ES
dc.description.bibliographicCitation Sencadas, V.; Lanceros-Mendez, S.; Sabater I Serra, R.; Andrio Balado, A.; Gómez Ribelles, JL. (2012). Relaxation dynamics of poly(vinylidene fluoride) studied by dynamical mechanical measurements and dielectric spectroscopy. The European Physical Journal E. 35(5):1-11. https://doi.org/10.1140/epje/i2012-12041-x es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion https://doi.org/10.1140/epje/i2012-12041-x es_ES
dc.description.upvformatpinicio 1 es_ES
dc.description.upvformatpfin 11 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 35 es_ES
dc.description.issue 5 es_ES
dc.identifier.pmid 22644136 es_ES
dc.relation.pasarela S\234435 es_ES
dc.contributor.funder Generalitat Valenciana es_ES
dc.contributor.funder Instituto de Salud Carlos III es_ES
dc.contributor.funder Ministerio de Economía y Empresa es_ES
dc.contributor.funder Ministerio de Ciencia e Innovación es_ES
dc.contributor.funder European Cooperation in Science and Technology es_ES
dc.contributor.funder Fundação para a Ciência e a Tecnologia, Portugal es_ES
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