Constantino, C. J L [UNESP]Job, A. E. [UNESP]Simões, R. D. [UNESP]Giacometti, J. A. [UNESP]Zucolotto, V.Oliveira, O. N.Gozzi, G. [UNESP]Chinaglia, D. L. [UNESP]2014-05-272014-05-272005-12-01Proceedings - International Symposium on Electrets, v. 2005, p. 178-181.http://hdl.handle.net/11449/68617The 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.178-181engBand structureNondestructive examinationPolymer filmsRaman spectroscopyVinyl resinsX ray diffractionBand characteristicsMicro Raman spectroscopyNon polar phasesRaman bandsPhase transitionsTrabalho apresentado em eventoAcesso aberto2-s2.0-338477610256475585105456744