dc.contributor | Universidade Estadual Paulista (Unesp) | |
dc.contributor | Universidade de São Paulo (USP) | |
dc.date.accessioned | 2014-05-27T11:21:44Z | |
dc.date.available | 2014-05-27T11:21:44Z | |
dc.date.created | 2014-05-27T11:21:44Z | |
dc.date.issued | 2005-12-01 | |
dc.identifier | Proceedings - International Symposium on Electrets, v. 2005, p. 178-181. | |
dc.identifier | http://hdl.handle.net/11449/68617 | |
dc.identifier | 2-s2.0-33847761025 | |
dc.identifier | 6475585105456744 | |
dc.description.abstract | The 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. | |
dc.language | eng | |
dc.relation | Proceedings - International Symposium on Electrets | |
dc.rights | Acesso aberto | |
dc.source | Scopus | |
dc.subject | Band structure | |
dc.subject | Nondestructive examination | |
dc.subject | Polymer films | |
dc.subject | Raman spectroscopy | |
dc.subject | Vinyl resins | |
dc.subject | X ray diffraction | |
dc.subject | Band characteristics | |
dc.subject | Micro Raman spectroscopy | |
dc.subject | Non polar phases | |
dc.subject | Raman bands | |
dc.subject | Phase transitions | |
dc.title | The investigation of α→β phase transition in poly(vinylidene fluoride) (PVDF) | |
dc.type | Actas de congresos | |