Peculiarities of dielectric relaxation in poly(vinylidene fluoride) with different thermal history

Kochervinskiĭ, V. V.; Malyshkina, I. A.; Gavrilova, N. D.; Sulyanov, S. N.; Бессонова, Н. П.

doi:10.1016/j.jnoncrysol.2007.03.034

Cited by 20 publications

(11 citation statements)

References 21 publications

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“…Figure 5 shows the heating DSC thermograms of 50% PZT by volume of PZT/PVDF composites having various ceramic particle sizes for a temperature range between 120 • C and 190 • C. where H is the melting enthalpy of the composite and H c is the melting enthalpy of 100% crystalline PVDF. The H c for pure PVDF is 104.7 J/g [28]. For calculation the obtained values were normalized to the mass of the polymer present in the sample.…”

Section: Resultsmentioning

confidence: 99%

PVDF Phase Formation and Its Influence on Electrical and Structural Properties of PZT-PVDF Composites

Greeshma

Balaji

Jayakumar

2013

Ferroelectrics Letters Section

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The aim of the study is to find the role of lead zirconate titanate (PZT) in the phase formation of poly vinylidene fluoride (PVDF) and its effect on electrical and structural properties of PZT-PVDF composites (50 Vol%) with 0-3 connectivity. PZT particles of different sizes ranging from micron to nano are used. The particle size (<100 nm) were determined from TEM and the broadening of the characteristic diffraction peaks in the x-ray diffraction (XRD) pattern. Scanning electron microscopy (SEM), studies were performed to analyze the nature of ceramic particle distribution within the matrix. The percentage of polymer crystallinity was determined from differential scanning calorimetry (DSC) and found to decrease with decrease in ceramic particle size. The decrease in the crystallinity percentage is due the hindrance offered by ceramic during the crystallization of the polymer. The melting endotherms of the composites were deconvoluted and the amount of PVDF β-phase present in the composites were determined and was found to decrease with decrease in ceramic particle size. Fourier transform infrared spectroscopy (FTIR) studies were also carried out to confirm the decrease in the β-phase content with decrease in particle size. The variation in the amount of β-phase of the polymer is due to the presence of PZT which acts as a source of electric field during poling and converts other polymer phases to β-phase. The piezoelectric coefficient and remnant polarization was found to decrease with decrease in ceramic particle size and is due to the decrease in percentage of β phase in the composites.

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Section: Resultsmentioning

confidence: 99%

PVDF Phase Formation and Its Influence on Electrical and Structural Properties of PZT-PVDF Composites

Greeshma

Balaji

Jayakumar

2013

Ferroelectrics Letters Section

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“…As numerous data on the dielectric relaxation show [18], the elec trical properties of crystallizing polymers with iono genic impurities must be considered in terms of Maxwell-Wagner polarization and near electrode polarization. In regards to the considered ferroelec tric polymer, this approach leads to dielectric non linearity [19] and the appearance of giant low fre quency dielectric dispersion [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Polarization of block textured films of ferroelectric copolymers of vinylidene fluoride with tetrafluoroethylene in an external field

et al. 2014

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The polarization of oriented films of the ferroelectric copolymer of vinylidene fluoride and tet rafluoroethylene in a sinusoidal electric field is studied. In low fields, the copolymer behaves as a linear dielectric whose permittivity nonlinearly increases with the amplitude of the alternating field. This behavior is related to the preferential orientation of the dipole moment of the chain along the normal to the surface and to the monocrystal structure formation. In higher fields, the hysteresis behaves formally coincidently with the behavior of an antiferroelectric. The important role of through stressed chains in the amorphous phase in the initiation of domains of a new direction in polar crystals is observed. Increased adsorption of water molecules on the surface of a polarized film is found and is attributed to the formation of the final den sity of the stable polarization charge on it.

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“…The M indicates a relaxation behavior in this temperature range which could be correlated to the interfacial relaxation (Maxwell-Wagner-Scillars) mechanism in the polymer nanocomposite. 29 This relaxation follows the Arrhenius type, 30, 31 f = f o exp(− E/RT) where f o is the constant, R is the gas constant and E is the activation energy. The plot of log f versus 1000/T is shown on the left side inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

Magnetic, dielectric and magnetodielectric properties of PVDF-La0.7Sr0.3MnO3 polymer nanocomposite film

Thirmal¹,

Nayek²,

Murugavel³

et al. 2013

AIP Advances

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We have investigated the structure, magnetic and dielectric properties of PVDFLa 0.7 Sr 0.3 MnO 3 polymer nanocomposite thick film fabricated by dip coating technique along with the magnetodielectric effect. The structure and dielectric properties show the enhanced β phase in the composite compared to the PVDF film. The coupling between the ferroelectric and magnetic phases in the composite is revealed in the form of dielectric anomaly at the ferromagnetic Curie temperature. We observed 1.9% magnetodielectric effect at 300 K with the possibility of enhanced effect near the transition temperature. In addition, the analysis of the electric modulus indicates that the composite exhibits interfacial related relaxation and it follows Arrhenius Law. Our study suggests that the ac conductivity of the PVDF-La 0.

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Peculiarities of dielectric relaxation in poly(vinylidene fluoride) with different thermal history

Cited by 20 publications

References 21 publications

PVDF Phase Formation and Its Influence on Electrical and Structural Properties of PZT-PVDF Composites

PVDF Phase Formation and Its Influence on Electrical and Structural Properties of PZT-PVDF Composites

Polarization of block textured films of ferroelectric copolymers of vinylidene fluoride with tetrafluoroethylene in an external field

Magnetic, dielectric and magnetodielectric properties of PVDF-La0.7Sr0.3MnO3 polymer nanocomposite film

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