A detailed dielectric spectroscopy study was performed on polyvinylidene fluoride (PVDF) and PVDF/CsHSO4 composites at temperatures 220 K ≤ T ≤ 340 K and frequencies 10 Hz ≤ ν ≤ 105 Hz. The observed dielectric spectra were described as a contribution of two relaxation processes and dc conductivity. The obtained relaxation time for each process revealed a saddle-like temperature dependence which could not be fitted to a single Arrhenius or Vogel-Fulcher-Tammann equation. This unusual temperature behavior was successfully analyzed using an empirical model previously proposed to interpret similar nonmonotonic behavior of the relaxation time in confined dielectric systems. A brief discussion is presented about a possibility that some part of the amorphous regions is confined by the surrounding crystalline regions and vice versa in PVDF and the composites.
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This work was supported by the Daejin University Research Grants in 2019.
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Shin, H.K. Dielectric Relaxation in Polyvinylidene Fluoride (PVDF)/CsHSO4 Composites. J. Korean Phys. Soc. 76, 49–54 (2020) doi:10.3938/jkps.76.49
- Dielectric relaxation
- Phase transitions