Please use this identifier to cite or link to this item:
- The investigation of α→β phase transition in poly(vinylidene fluoride) (PVDF)
- Universidade Estadual Paulista (UNESP)
- Universidade de São Paulo (USP)
- 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.
- Proceedings - International Symposium on Electrets, v. 2005, p. 178-181.
- Band structure
- Nondestructive examination
- Polymer films
- Raman spectroscopy
- Vinyl resins
- X ray diffraction
- Band characteristics
- Micro Raman spectroscopy
- Non polar phases
- Raman bands
- Phase transitions
- Acesso restrito
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.