• Santosh Pawar

      Articles written in Bulletin of Materials Science

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

      S Satapathy Santosh Pawar P K Gupta K B R Varma

      More Details Abstract Fulltext PDF

      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.

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