Thermal and mechanical energy harvester based on flexible PVDF/PLZT polymer-ceramic composites

Vandana,; Tomar, Monika; Gupta, Reema

doi:10.1007/s10965-023-03694-7

Cited by 3 publications

(1 citation statement)

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“…Polyvinylidene fluoride (PVDF) is a promising ferroelectric material due to its unique piezoelectric properties. It can be utilized as an active component in energy converters, such as tactile sensors [1][2][3], hydroacoustic systems [4] and nanogenerators [5][6][7]. PVDF exhibits high dielectric properties and can also be used in capacitors [8,9] to significantly enhance their capacitance.…”

Section: Introductionmentioning

confidence: 99%

Relaxation processes in the oriented polyvinylidene fluoride films with various crystalline phase composition

Gerasimov,

Nikonorova,

Kuryndin

et al. 2024

Preprint

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Oriented polyvinylidene fluoride (PVDF) films were obtained in multistage process based on melt extrusion of polymer. We investigated the results of the polymorphic α→β crystalline phase transformation in the PVDF films subjected to uniaxial stretching. During uniaxial extension both appearance of a polar piezo active crystalline structure and significant changes in the samples morphology were observed. Variations in the PVDF films morphology, polymorphic composition, and supramolecular structure upon transformation were detected with wide-angle X-ray scattering and scanning electron microscopy techniques. Broadband dielectric spectroscopy was used to ascertain a change in molecular mobility of the polymer chains during α→β phase transformation. The relaxation processes, γ-, αа-, αс-, and interfacial polarization, in both α- and β-phases of PVDF were identified in the dielectric loss spectra and described with either Arrhenius or Vogel-Fulcher-Tammann equations. The analysis of the equations parameters allowed concluding that that initiation of a polymorphic α→β transition through uniaxial extension results in hindering of the relaxators mobility in the β-phase of PVDF samples, except γ-relaxators. This finding confirms a proposal that γ-relaxators are located in the amorphous part of PVDF. Uniaxial extension resulted in a substantial increase in the interfacial polarization, which can be attributed to the emergence of new interface boundaries.

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