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Broadband dielectric dispersion (20 Hz–1 GHz) and relaxation, crystalline structure, and thermal characterization of PVDF/PMMA blend films

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Abstract

Polymer blend films consisted of poly(vinylidene fluoride) (PVDF) and poly(methyl methacrylate) (PMMA) (compositional ratios of PVDF/PMMA = 100/0, 80/20, 60/40, 40/60, 20/80, and 0/100 wt/wt%) were prepared by solution casting method. These PVDF/PMMA blend films were characterized by employing an X-ray diffractometer, Fourier transform infrared spectroscopy, scanning electron microscope, differential scanning calorimeter, and broadband dielectric relaxation spectroscopy. The PVDF crystal phases formed in these polymer blends were explained and their crystallite sizes, degree of crystallinity, and melting temperatures were determined. The dielectric dispersion study over the broadband frequency range of 20 Hz–1 GHz confirmed the decrease in dielectric permittivity with increased frequency of the applied harmonic electric field and it changed anomalously when the PVDF/PMMA blend compositional ratio varied. Dielectric loss tangent spectra illustrated the blend composition-dependent PVDF chain segmental relaxation process in these polymer blends which appeared in the radio frequency region. The alternating current electrical conductivity spectra revealed the increase in conductivity with increased frequency, and at a fixed frequency, the conductivity showed a variation in one order of magnitude with the variation in the blend composition ratio over the entire range. The experimental results highlighted that these PVDF/PMMA blend films could be used as frequency tunable dielectrics and insulating materials for advances in next-generation flexible device technologies.

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Acknowledgements

The University Grants Commission, New Delhi, is gratefully acknowledged for the experimental grant through SAP DRS-II Project Grant [No. F.530/12/DRS-II/2016(SAP-I)].

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  1. Dielectric Research Laboratory, Department of Physics, Jai Narain Vyas University, Jodhpur, 342 005, India

    Naresh Kumar & R. J. Sengwa

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Kumar, N., Sengwa, R.J. Broadband dielectric dispersion (20 Hz–1 GHz) and relaxation, crystalline structure, and thermal characterization of PVDF/PMMA blend films. Polym. Bull. 80, 12021–12046 (2023). https://doi.org/10.1007/s00289-022-04632-1

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