Satapathy, S. ; Pawar, Santosh ; Gupta, P. K. ; Varma, K. B. R. (2011) Effect of annealing on the phase transition in poly (vinylidene fluoride) films prepared using polar solvent Bulletin of Materials Science, 34 (4). pp. 727-733. ISSN 0250-4707
![]()
|
PDF
- Publisher Version
655kB |
Official URL: http://www.ias.ac.in/matersci/bmsjul2011/727.pdf
Related URL: http://dx.doi.org/10.1007/s12034-011-0187-0
Abstract
The γ -phase poly (vinylidene fluoride) (PVDF) films are usually prepared using dimethyl sulfoxide (DMSO) solvent, regardless of preparation temperature. Here we report the crystallization of both α and γ -phase PVDF films by varying preparation temperature using DMSO solvent. The γ -phase PVDF films were annealed at 70, 90, 110, 130 and 160°C for five hours. The changes in the phase contents in the PVDF at different annealing conditions have been described. When thin films were annealed at 90°C for 5 h, maximum percentage of β -phase appears in PVDF thin films. The γ -phase PVDF films completely converted to α -phase when they were annealed at 160°C for 5 h. From X-ray diffraction (XRD), Fourier transform infrared spectrum (FTIR), differential scanning calorimetry (DSC) and Raman studies, it is confirmed that the PVDF thin films, cast from solution and annealed at 90°C for 5 h, have maximum percentage of β -phase. The β -phase PVDF shows a remnant polarization of 4.9 µC/cm2 at 1400 kV/cm at 1 Hz.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to Indian Academy of Sciences. |
Keywords: | PVDF; Phase Transition; XRD; FTIR; Raman-spectra; DSC; Hysteresis |
ID Code: | 83464 |
Deposited On: | 22 Feb 2012 12:52 |
Last Modified: | 19 May 2016 00:18 |
Repository Staff Only: item control page