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      https://www.ias.ac.in/article/fulltext/boms/034/04/0727-0733

    • Keywords

       

      PVDF; phase transition; XRD; FTIR; Raman-spectra; DSC; hysteresis.

    • 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.

    • Author Affiliations

       

      S Satapathy1 Santosh Pawar2 P K Gupta1 K B R Varma3

      1. Laser Materials Development and Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India
      2. Department of Applied Physics, SGSITS, Indore 452 003, India
      3. Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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