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dc.contributor.authorConstantino, C. J L-
dc.contributor.authorJob, A. E.-
dc.contributor.authorSimões, R. D.-
dc.contributor.authorGiacometti, J. A.-
dc.contributor.authorZucolotto, V.-
dc.contributor.authorOliveira, O. N.-
dc.contributor.authorGozzi, G.-
dc.contributor.authorChinaglia, D. L.-
dc.identifier.citationProceedings - International Symposium on Electrets, v. 2005, p. 178-181.-
dc.description.abstractThe phase transition from the non-polar α-phase to the polar β-phase of poly(vinylidene fluoride) (PVDF) has been investigated using micro-Raman spectroscopy, which is advantageous for being a non-destructive technique. Films of α-PVDF were subjected to stretching under controlled rates and at 80°C, the transition to β-PVDF being monitored by the decrease in the Raman band at 794 cm-1 characteristic of the α-phase, with the concomitant increase in the 839 cm-1 band characteristic of the β-phase. Poling with negative corona discharge was found to affect the a-PVDF morphology improving the Raman bands related to this crystalline phase. This effect is minimized for films stretched to higher ratios. Significantly, corona-induced effects could not be observed with the other experimental techniques, viz. X-ray diffraction and infrared spectroscopy.en
dc.subjectBand structure-
dc.subjectNondestructive examination-
dc.subjectPolymer films-
dc.subjectRaman spectroscopy-
dc.subjectVinyl resins-
dc.subjectX ray diffraction-
dc.subjectBand characteristics-
dc.subjectMicro Raman spectroscopy-
dc.subjectNon polar phases-
dc.subjectRaman bands-
dc.subjectPhase transitions-
dc.titleThe investigation of α→β phase transition in poly(vinylidene fluoride) (PVDF)en
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.description.affiliationFaculdade de Ciências e Tecnologia UNESP, 19060-900 - Presidente Prudente, SP-
dc.description.affiliationInstitute de Física de São Carlos USP, 13566-590 - São Carlos, SP-
dc.description.affiliationInstituto de Geociências e Ciência Exatas UNESP, 13500-970 - Rio Claro, SP-
dc.description.affiliationUnespFaculdade de Ciências e Tecnologia UNESP, 19060-900 - Presidente Prudente, SP-
dc.description.affiliationUnespInstituto de Geociências e Ciência Exatas UNESP, 13500-970 - Rio Claro, SP-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofProceedings - International Symposium on Electrets-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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