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Effect of annealing on phase transition in poly(vinylidene fluoride) films prepared using polar solvent

Satapathy, S and Pawar, Santosh and Gupta, PK and Varma, KBR (2011) Effect of annealing on phase transition in poly(vinylidene fluoride) films prepared using polar solvent. In: Bulletin of Materials Science, 34 (4). pp. 727-733.

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Official URL: http://trove.nla.gov.au/work/157892781

Abstract

The gamma-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 alpha and gamma-phase PVDF films by varying preparation temperature using DMSO solvent. The gamma-phase PVDF films were annealed at 70, 90, 110, 130 and 160 degrees 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 degrees C for 5 h, maximum percentage of beta-phase appears in PVDF thin films. The gamma-phase PVDF films completely converted to alpha-phase when they were annealed at 160 degrees 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 degrees C for 5 h, have maximum percentage of beta-phase. The beta-phase PVDF shows a remnant polarization of 4.9 mu C/cm(2) at 1400 kV/cm at 1 Hz.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: PVDF;phase transition;XRD;FTIR;Raman-spectra;DSC;hysteresis
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 27 Jan 2012 06:46
Last Modified: 27 Jan 2012 06:46
URI: http://eprints.iisc.ac.in/id/eprint/43215

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