Dielectric relaxation, ac conductivity and electric modulus in poly(vinylidene fluoride)/NaY zeolite composites

Lopes, Ana Catarina; Costa, Carlos M.; Serra, Roser Sabater i; Neves, I.C.; Ribelles, J. L. Gomez; Lanceros‐Méndez, S.

doi:10.1016/j.ssi.2013.01.013

Cited by 108 publications

(71 citation statements)

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“…The WO 3 $H 2 O NPs show negative zeta potential (Fig. 8,10,31,37,[42][43][44][45][46][47] The increase of free amorphous chains in the samples due to increase of the fraction of electroactive b phase nucleation also contribute to the large increase in dielectric strength or dielectric constant of the samples. So, the crystallization of polar b phase occurs on the negatively charged at surfaces of the NPs.…”

Section: Resultsmentioning

confidence: 99%

“…Frequency dependence. 31,[43][44][45][46][47] Due to difference in conductivity or dielectric constant of the NPs and PVDF, when an electric eld is applied on the samples the charge carriers move freely and accumulate at the interface of the NPs and the polymer matrix. 13 represents the dependency of the dielectric properties on the frequency of pure PVDF and NPs modied polymer thin lms.…”

Section: Resultsmentioning

confidence: 99%

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Improvement of electroactive β phase nucleation and dielectric properties of WO₃·H₂O nanoparticle loaded poly(vinylidene fluoride) thin films

et al. 2015

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Tungsten oxide hydrate (WO 3 $H 2 O) nanoparticles (NPs) have been prepared by simple hydrazine hydrate reduction. X-ray diffraction, UV-Visible spectroscopy and field emission electron scanning microscopy confirm the formation of phase pure orthorhombic WO 3 $H 2 O NPs. Thereafter, poly(vinylidene fluoride) (PVDF) thin films doped with different amounts of WO 3 $H 2 O NPs (1-15 mass%) have been prepared via a simple solution-casting method to verify the role of the NPs on the enhancement of electroactive b phase crystallization and dielectric properties of WO 3 $H 2 O NP-PVDF thin films. The interface between the NPs and the polymer matrix takes a vital role in improving b phase nucleation and dielectric properties of the WO 3 $H 2 O NP modified PVDF thin films. Strong electrostatic or ion-dipole interaction between the negatively charged NP surfaces and -CH 2 dipoles of the polymer matrix at the interface effectively improves the electroactive b phase nucleation and dielectric properties of the nanocomposite thin films.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Improvement of electroactive β phase nucleation and dielectric properties of WO₃·H₂O nanoparticle loaded poly(vinylidene fluoride) thin films

et al. 2015

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“…22 The width of this signal corresponds to the range of frequencies in which charge carriers can move over a long distance successfully hopping to a neighboring site. 29 In addition, an enhancement of the contribution of dc conductivity effects (at low frequency) can be seen by using the electric modulus formalism. The second relaxation process, α c -relaxation, occurs at higher temperatures.…”

Section: Electric Modulusmentioning

confidence: 99%

Dielectric properties of PVDF thin films doped with 3 wt.% of RCl3 (R = Gd or Er)

2014

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The dielectric permittivity (ɛ′), electric modulus (M″), and ac conductivity (σac) of pure polyvinylidene fluoride (PVDF) and PVDF containing 3 wt.% RCl3 (R = Er or Gd) were measured. The incorporation of 3 wt.% of ErCl3 or GdCl3 within the PVDF matrix is found significantly to increase its ɛ′ and σac. All investigated samples show different relaxation processes within the studied temperature and frequency ranges. The first process is αa-relaxation, which occurs around the glass transition temperature, Tg. The second process is αc-relaxation, which is associated with the molecular motions in the crystalline region of the main polymer chain. Third is the ρ-relaxation which observed for pure PVDF at low temperatures and high frequencies. The frequency dependence of σac shows that the conduction mechanism for pure PVDF and PVDF containing 3 wt.% of RCl3 is correlated barrier hopping (CBH). The binding energy of the carriers was calculated based on the CBH model. Finally, the results obtained in this work are discussed and compared with those for 3 wt.% LaCl3-doped PVDF and similar materials.

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“…In recent studies, it was reported that nucleation by organic modified titanosilicates ( Zeolite is being used to modify polymer properties. The inclusion of the NaY zeolite filler in the polymer matrix induces the crystallization of PVDF in the γ phase [129]. Interactions between the dipolar moments of PVDF and the negatively charged NaY zeolite surfaces preferentially induce the transconformation of PVDF monomer units characteristic of the γ-phase.…”

Section: Adding Inorganic Fillersmentioning

confidence: 99%

Crystalline polymorphism in poly(vinylidenefluoride) membranes

Cui

Hassankiadeh

Zhuang

et al. 2015

Progress in Polymer Science

355

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Dielectric relaxation, ac conductivity and electric modulus in poly(vinylidene fluoride)/NaY zeolite composites

Cited by 108 publications

References 50 publications

Improvement of electroactive β phase nucleation and dielectric properties of WO₃·H₂O nanoparticle loaded poly(vinylidene fluoride) thin films

Improvement of electroactive β phase nucleation and dielectric properties of WO₃·H₂O nanoparticle loaded poly(vinylidene fluoride) thin films

Dielectric properties of PVDF thin films doped with 3 wt.% of RCl3 (R = Gd or Er)

Crystalline polymorphism in poly(vinylidenefluoride) membranes

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Dielectric relaxation, ac conductivity and electric modulus in poly(vinylidene fluoride)/NaY zeolite composites

Cited by 108 publications

References 50 publications

Improvement of electroactive β phase nucleation and dielectric properties of WO3·H2O nanoparticle loaded poly(vinylidene fluoride) thin films

Improvement of electroactive β phase nucleation and dielectric properties of WO3·H2O nanoparticle loaded poly(vinylidene fluoride) thin films

Dielectric properties of PVDF thin films doped with 3 wt.% of RCl3 (R = Gd or Er)

Crystalline polymorphism in poly(vinylidenefluoride) membranes

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Improvement of electroactive β phase nucleation and dielectric properties of WO₃·H₂O nanoparticle loaded poly(vinylidene fluoride) thin films

Improvement of electroactive β phase nucleation and dielectric properties of WO₃·H₂O nanoparticle loaded poly(vinylidene fluoride) thin films