Infrared spectroscopic investigation of poly (vinylidene fluoride) in an electric field

Büchtemann, A.; Schmolke, R.

doi:10.1002/polb.1991.090291013

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…Carbon electrodes were evaporated onto both sides of the film using a Denton Bench Top Turbo III high vacuum evaporator. The thickness of carbon electrodes was optimized so that the resulting resistance was several kΩ with a baseline transmittance of 80–90%. − High electric fields were supplied with a Matsusada AMT-20B10–B high voltage amplifier.…”

Section: Methodsmentioning

confidence: 99%

Reduction of Dielectric Hysteresis in Multilayered Films via Nanoconfinement

et al. 2012

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Micro/nanolayer coextrusion was used to fabricate polycarbonate (PC)/poly(vinylidene fluoride) (PVDF) layered films with significantly reduced dielectric losses while maintaining high energy density. The high-field polarization hysteresis was characterized for layered films as a function of PVDF layer thickness (6000 to 10 nm) and composition (10 to 70 vol % PVDF), and was found to decrease with decreasing layer thickness and PVDF content. To gain a mechanistic understanding of the layer thickness (or nanoconfinement) effect, wide-angle X-ray diffraction, polarized Fourier transform infrared spectroscopy, and broadband dielectric spectroscopy were employed. The results revealed that charge migration, instead of dipole flipping, was responsible for the hysteresis in multilayered films. The absence of PVDF dipoleflipping was attributed to the nonuniform electric field distribution in the layered structure, where the field in PVDF layers were calculated to be significantly lower than that in PC layers due to large contrast in dielectric constant (∼3 for PC versus ∼12 for PVDF). The charges were likely to be impurity ions in the form of catalyst residue or surfactants from suspension polymerization. The characteristics of the dielectric spectroscopy relaxation indicated that ions mostly existed in the PVDF layers, and PC/PVDF interfaces prevented them from entering adjacent layers. Therefore, as the layer thickness decreases to nanometer scales, the amount of ion movement, dielectric loss, and hysteresis were decreased. This study provides clear evidence of the nanoconfinement effect in multilayered films, which advantageously decreases the hysteresis loss.

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Section: Methodsmentioning

confidence: 99%

Reduction of Dielectric Hysteresis in Multilayered Films via Nanoconfinement

et al. 2012

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“…u¦Λ Ҳ . Ƭ Ҳ_ ɹƵӐ7, u¦Ǧ ʚ Ҳʚ ϛ 6&, ɹؕ Ǚ 7 ̘ u¦uOǙғ ɭ@ҲT [9] . ̘ք̽Ǽ , ғǓ 1369 D 890 cm −1 Ҳқ Ǚ ȴ [10] .…”

mentioning

confidence: 99%

交联聚乙烯的结构形态与空间电荷分布

吴¹,

李²,

张³

et al. 2002

SSMA

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Infrared spectroscopic study of field‐induced band shifts and dipole orientation in poly(vinylidene fluoride)

Büchtemann¹,

Müller²,

Stark³

1992

Acta Polymerica

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Infrared spectra of uniaxially drawn 8-PVDF films under the influence of an electric field were registered. The direction and the strength of the applied field were changed in up to 13 cycles. The field-induced frequency changes of the bands at 445 cm-' (CF2-rocking) and 510 cm-' (CF,-bending) were studied in detail. Model calculations concerning the influence of the field on band frequencies are presented revealing the possibility to discriminate by IR spectroscopy between opposite dipole directions. The experimental results suggest the formation of a remanent field in the samples during poling. Infi.arotspektI.oskopi.~che Untc.r.sirchling del.,/elrlitidir--ierterl F~ec~iiet~~ver.~cliiebiit~g iinci Dipolorietitieriitig in Po ly (vin.vlirien :flu o rid) Uniaxial gereckte. in der 8-Modifikation vorliegende PVDF-Filme wurden bei anliegendem elektrischen Feld infrarotspektroskopisch untersucht. In bis zu 13 Feldstarkecyclen wurden dabei sowohl die Feldstlrke als auch die Richtung des anliegenden Feldes variiert. Die feldinduzierten Frequenzanderungen der Banden bei 445 cm-' (CF,-rocking) und 510 cm-' (CF,-bending) wurden detailliert registriert. Modellrechnungen zum EinfluR des Feldes auf die Schwingungsfrequenzen demonstrieren die Moglichkeit, mit Hilfe der Infrarotspektroskopie zwischen entgegengesetzten Dipolrichtungen zu unterscheiden. Die experimentellen Ergebnisse deuten auf die Existenz eines remanenten Feldes in der Probe infolge der Einwirkung des au8eren Feldes hin. 0323-7648/92/0102-0001$3.50 + .25/0

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Infrared spectroscopic investigation of poly (vinylidene fluoride) in an electric field

Cited by 7 publications

References 26 publications

Reduction of Dielectric Hysteresis in Multilayered Films via Nanoconfinement

Reduction of Dielectric Hysteresis in Multilayered Films via Nanoconfinement

交联聚乙烯的结构形态与空间电荷分布

Infrared spectroscopic study of field‐induced band shifts and dipole orientation in poly(vinylidene fluoride)

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