Some features of the crystallization of polyvinylidenefluoride

Madorskaya, L.Ya.; Loginova, N. N.; Kastorskii, L.P.; Kuz'michev, O.V.; Maksimov, V. L.; Lobanov, A.M.

doi:10.1016/0032-3950(86)90136-x

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The film annealed at 90 °C exhibits double melting peak. The low temperature melting peak is due to formation of α crystalline phase, where high temperature peak is due to the β-phase [28,29]. The film annealed at temperature other than 90 °C do not show double melting peak; which indicate that PVDF film predominantly crystallizes in single phase [30].…”

Section: Resultsmentioning

confidence: 90%

Influence of annealing on dielectric and polarization behavior of PVDF thick films

Kaur

Kumar

Sharma

et al. 2017

J Mater Sci: Mater Electron

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The polyvinylidene fluoride (PVDF) thick film has been fabricated by a solution casting method. The fabricated film is subjected to annealing at 50, 90, 100, 110 and 130 °C for 5 h. The effect of annealing on structural, crystalline, dielectric and polarization behavior is investigated. The β-phase PVDF is found to coexist with α-phase for annealing temperature upto 100 °C, after that β-phase is converted to α-phase. The film annealed at 100 °C, exhibits enhanced permittivity, reduced tangent loss and enhanced polarization. The dielectric permittivity and tangent loss of film annealed at 100 °C are ~11 and ~0.025 respectively for the frequency range of 10 3 -10 5 Hz. The saturation polarization for this film is ~1.27 µC/cm 2 . The enhanced dielectric permittivity and polarization for the film annealed at 100 °C might be attributed to increase in crystalline α and β-phase interface as well as crystalline amorphous interface. The thick film of PVDF with improved dielectric and polarization behavior could be useful for high power electronics application.

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Section: Resultsmentioning

confidence: 90%

Influence of annealing on dielectric and polarization behavior of PVDF thick films

Kaur

Kumar

Sharma

et al. 2017

J Mater Sci: Mater Electron

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“…Thus, according to the data of Madorskaya et al, 63 for the copolymerisa^ion of VDF with TEF, an increase in the synthesis temperature from 303 to 373 K gives rise to a tendency towards an increase in the number of 'head to head' defects (from 3.5% to 4.7%)* for an approximately similar molecular mass of the chain. This leads to a small decrease in the equilibrium melting point and the enthalpy of fusion and to an almost two fold increase in the half-crystallisation time.…”

Section: A' A" A' A' A" A" A'mentioning

confidence: 79%

The structure and properties of block poly(vinylidene fluoride) and systems based on it

1996

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Crystal transformation and thermomechanical properties of poly(vinylidene fluoride)/clay nanocomposites

Pramoda

Mohamed

Phang

et al. 2004

Polymer International

148

117

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The crystal transformation and thermomechanical properties of melt‐intercalated poly(vinylidene fluoride) (PVDF)/clay nanocomposites are reported in this study. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used to study the thermal properties of PVDF and its nanocomposites with various clay concentrations. The incorporation of clay in PVDF results in the formation of β‐form crystals of PVDF. DSC study of melting behavior suggested the presence of only α‐phase crystals in neat PVDF and both α‐ and β‐phase crystals in the nanocomposite. This conclusion was corroborated by findings from Fourier‐transform infrared (FTIR) spectroscopy and X‐ray diffraction (XRD). Dynamic mechanical analysis (DMA) indicated significant improvements in storage modulus over a temperature range of 20–150 °C. The coefficient of thermal expansion (CTE) decreases with increasing clay loading. Copyright © 2004 Society of Chemical Industry

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Some features of the crystallization of polyvinylidenefluoride

Cited by 3 publications

References 2 publications

Influence of annealing on dielectric and polarization behavior of PVDF thick films

Influence of annealing on dielectric and polarization behavior of PVDF thick films

The structure and properties of block poly(vinylidene fluoride) and systems based on it

Crystal transformation and thermomechanical properties of poly(vinylidene fluoride)/clay nanocomposites

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