Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies

Detalhes bibliográficos
Autor(a) principal: Sencadas, Vítor João Gomes Silva
Data de Publicação: 2005
Outros Autores: Costa, Carlos M., Moreira, V., Monteiro, Jorge, Mendiratta, Sushil K., Mano, J. F., Lanceros-Méndez, S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/4358
Resumo: ß-Poly(vinylidene fluoride) (ß-PVDF) exhibits ferroelectric properties due to the special arrangement of the chain units in the crystalline phase. The piezoelectric properties of the material can be optimised by poling the original stretched film. The main effect of the poling process is the alignment of the randomly organised dipolar moments against the applied field. In this work, poled and non-poled ß-PVDF from the same batch are characterised by dielectric spectroscopy. The origin of the electrical and mechanical response of poled and non-poled ß-PVDF were further explored by far IR spectroscopy and discussed on a molecular level. The main effect of the poling process on-the dielectric response of the-material is a small increase of the dielectric constant due to the 'preferential alignment of the main dipolar contribution and a slight decrease of the dielectric loss, due to the more organized amorphous structure. The conductivity is strongly increased by poling, especially the high-temperature conductivity, ascribed mainly to hopping conductivity due to free charges induced during poling. FTIR experiments indicate that the origin of these effects and also of the variations in the thermo-mechanical response of the material can be found in the reorientation of the crystalline dipoles along the poling field, together with a partial reduction of the amount of alpha phase and an increase of the amount of ß phase. The alpha to beta transformation, mainly due to the stretching process, seems to be optimized by the poling process.
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spelling Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studiesPoling effectPolymersDetaMechanical propertiesReorientational dynamicsTemperatureScience & Technologyß-Poly(vinylidene fluoride) (ß-PVDF) exhibits ferroelectric properties due to the special arrangement of the chain units in the crystalline phase. The piezoelectric properties of the material can be optimised by poling the original stretched film. The main effect of the poling process is the alignment of the randomly organised dipolar moments against the applied field. In this work, poled and non-poled ß-PVDF from the same batch are characterised by dielectric spectroscopy. The origin of the electrical and mechanical response of poled and non-poled ß-PVDF were further explored by far IR spectroscopy and discussed on a molecular level. The main effect of the poling process on-the dielectric response of the-material is a small increase of the dielectric constant due to the 'preferential alignment of the main dipolar contribution and a slight decrease of the dielectric loss, due to the more organized amorphous structure. The conductivity is strongly increased by poling, especially the high-temperature conductivity, ascribed mainly to hopping conductivity due to free charges induced during poling. FTIR experiments indicate that the origin of these effects and also of the variations in the thermo-mechanical response of the material can be found in the reorientation of the crystalline dipoles along the poling field, together with a partial reduction of the amount of alpha phase and an increase of the amount of ß phase. The alpha to beta transformation, mainly due to the stretching process, seems to be optimized by the poling process.Fundação para a Ciência e Tecnologia (FCT) - Programa Operacional "Ciência, Tecnologia, Inovação" (POCTI) - POCTI/CTM/33501/99.European Polymer FederationUniversidade do MinhoSencadas, Vítor João Gomes SilvaCosta, Carlos M.Moreira, V.Monteiro, JorgeMendiratta, Sushil K.Mano, J. F.Lanceros-Méndez, S.2005-01-172005-01-17T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/4358eng"E-Polymers". ISSN 1618-7229. 002 (2005) 1-12.1618-7229www.e-polymers.orginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:22:16Zoai:repositorium.sdum.uminho.pt:1822/4358Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:15:43.828797Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies
title Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies
spellingShingle Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies
Sencadas, Vítor João Gomes Silva
Poling effect
Polymers
Deta
Mechanical properties
Reorientational dynamics
Temperature
Science & Technology
title_short Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies
title_full Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies
title_fullStr Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies
title_full_unstemmed Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies
title_sort Poling of ß-poly(vinylidene fluoride): dielectric and IR spectroscopy studies
author Sencadas, Vítor João Gomes Silva
author_facet Sencadas, Vítor João Gomes Silva
Costa, Carlos M.
Moreira, V.
Monteiro, Jorge
Mendiratta, Sushil K.
Mano, J. F.
Lanceros-Méndez, S.
author_role author
author2 Costa, Carlos M.
Moreira, V.
Monteiro, Jorge
Mendiratta, Sushil K.
Mano, J. F.
Lanceros-Méndez, S.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Sencadas, Vítor João Gomes Silva
Costa, Carlos M.
Moreira, V.
Monteiro, Jorge
Mendiratta, Sushil K.
Mano, J. F.
Lanceros-Méndez, S.
dc.subject.por.fl_str_mv Poling effect
Polymers
Deta
Mechanical properties
Reorientational dynamics
Temperature
Science & Technology
topic Poling effect
Polymers
Deta
Mechanical properties
Reorientational dynamics
Temperature
Science & Technology
description ß-Poly(vinylidene fluoride) (ß-PVDF) exhibits ferroelectric properties due to the special arrangement of the chain units in the crystalline phase. The piezoelectric properties of the material can be optimised by poling the original stretched film. The main effect of the poling process is the alignment of the randomly organised dipolar moments against the applied field. In this work, poled and non-poled ß-PVDF from the same batch are characterised by dielectric spectroscopy. The origin of the electrical and mechanical response of poled and non-poled ß-PVDF were further explored by far IR spectroscopy and discussed on a molecular level. The main effect of the poling process on-the dielectric response of the-material is a small increase of the dielectric constant due to the 'preferential alignment of the main dipolar contribution and a slight decrease of the dielectric loss, due to the more organized amorphous structure. The conductivity is strongly increased by poling, especially the high-temperature conductivity, ascribed mainly to hopping conductivity due to free charges induced during poling. FTIR experiments indicate that the origin of these effects and also of the variations in the thermo-mechanical response of the material can be found in the reorientation of the crystalline dipoles along the poling field, together with a partial reduction of the amount of alpha phase and an increase of the amount of ß phase. The alpha to beta transformation, mainly due to the stretching process, seems to be optimized by the poling process.
publishDate 2005
dc.date.none.fl_str_mv 2005-01-17
2005-01-17T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/4358
url http://hdl.handle.net/1822/4358
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "E-Polymers". ISSN 1618-7229. 002 (2005) 1-12.
1618-7229
www.e-polymers.org
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv European Polymer Federation
publisher.none.fl_str_mv European Polymer Federation
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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