Dielectric relaxation and thermal studies on dispersed phase polymer nanocomposite films

Shukla, Namrata; Thakur, Awalendra K.; Shukla, Archana; Chatterjee, Ratnamala

doi:10.1007/s10854-014-1940-0

Cited by 16 publications

(7 citation statements)

References 44 publications

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“…From the figure, it is quite evident that the dielectric loss increases with an increase in filler content (up to 2 wt % of Ca 0.2 Zn 0.8 O) owing to an increase in the number of charge carriers with optimal polymer–filler interactions. However, further increase in filler content (above 4 wt %) brings about a decreased dissipation due to the agglomeration of fillers at higher concentrations . In contrast to the filler effect, the variation of frequency has a profound influence on energy dissipation, which decreases sharply with an increase in frequency.…”

Section: Resultsmentioning

confidence: 98%

Highly Flexible and Visibly Transparent Poly(vinyl alcohol)/Calcium Zincate Nanocomposite Films for UVA Shielding Applications As Assessed by Novel Ultraviolet Photon Induced Fluorescence Quenching

et al. 2016

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Herein we report the successful fabrication of highly flexible, reversibly stretchable, transparent, and conductive poly(vinyl alcohol) (PVA) nanocomposite (NC) films with a hydrophobic surface by reinforcing varying amounts, viz., 0, 0.5, 1, 2, and 4 wt %, of calcium zincate (Ca0.2Zn0.8O) nanofillers. The developed nanocomposite films show appreciable UVA screening efficacies as established by a novel (UV-transillumination studies) method. The Fourier transform infrared (FTIR) studies reveal a positive interaction between PVA matrix and incorporated nanofiller, while scanning electron microscopic (SEM) studies support uniform filler dispersions. The electronic spectral studies substantiate the changes in electronic band structure of composite films leading to appreciable changes in the optoelectronic properties. The fluorescent emission studies reveal dopant-dependent photonic emissions, while the dielectric properties, such as dielectric constant (ε′) and dielectric loss (ε″), increase with an increase in filler volumes up to an optimal filler fraction (2 wt % of Ca0.2Zn0.8O) owing to the segmental motion of polymer chains in addition to interfacial polarization associated with multicomponent systems. The developed films with excellent optoelectronic properties alongside appreciable flexibilities and stretchabilities aid their applications as multifunctional UVA shielding polymeric composites with enhanced photoconductivities.

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Section: Resultsmentioning

confidence: 98%

Highly Flexible and Visibly Transparent Poly(vinyl alcohol)/Calcium Zincate Nanocomposite Films for UVA Shielding Applications As Assessed by Novel Ultraviolet Photon Induced Fluorescence Quenching

et al. 2016

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“…It can be noted from the figure that the ε′ values sharply increase with the decrease of frequency in the low frequency region and finally attain the values higher than four orders of magnitude at 20 Hz. These high ε′ values at low frequencies are due to dominant contribution of the electrode polarization (EP) effect which is a common behaviour of all the studied SPE materials [17,19,27,[29][30][31][32][33][34][35][42][43][44][45][46][47]. Further, there is a gradual decrease in ε′ values with the increase of frequency above 10 kHz and they finally approach a steady state around 1 MHz.…”

Section: Effect Of Salt Concentrationmentioning

confidence: 86%

Effectively improved ionic conductivity of montmorillonite clay nanoplatelets incorporated nanocomposite solid polymer electrolytes for lithium ion-conducting devices

2018

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Synergistic effects of lithium salt concentration and inorganic nanofiller incorporation on the ionic conductivity of polymer blend matrix based nanocomposite solid polymer electrolytes (NSPEs) have been examined. The montmorillonite (MMT) clay nanoplatelets incorporated NSPE films based on poly(ethylene oxide) and poly(methyl methacrylate) blend matrix with lithium tetrafluoroborate (LiBF 4) ionic salt have been prepared by the solution-cast method followed by melt-press technique. The 1, 3, and 5 wt% MMT amounts along with 13.3 wt% LiBF 4 amount as compared to the weight of polymer blend have been used for the preparation of NSPE films. X-ray diffractometer (XRD) and the Fourier transform infrared (FTIR) spectrometer have been employed for structural characterization of these NSPE films. The complex permittivity and ac electrical conductivity spectra are investigated by using the dielectric relaxation spectroscopy, whereas the electrochemical performance of these materials has been characterized by the electrochemical analyzer. The XRD patterns reveal that the NSPEs are predominantly amorphous and have the intercalated and exfoliated MMT platelets, whereas the relative changes in their FTIR spectra confirm the ion-dipolar-nanofiller interactions between the functional groups of the blended polymers, lithium ions, and the MMT nanoplatelets. The permittivity and conductivity spectra of these materials are analyzed for exploring the dominant contribution of electrode polarization and dipolar polarization in the low and high frequency regions, respectively, and the presence of relaxation processes associated with structural dynamics of the solid-state ion-dipolar complexes. It has been found that the NSPE of relatively fast polymer chain segmental dynamics exhibits higher ionic conductivity. The room temperature ionic conductivity of the 13.3 wt% LiBF 4 containing SPE is found more than two times higher as compared to that of the SPE film having 9.7 wt% LiBF 4. When the MMT is incorporated, the ionic conductivity of 13.3 wt% LiBF 4 containing NSPEs enhances by about one order of magnitude at room temperature. The dc ionic conductivity of the 13.3 wt% LiBF 4 containing SPE film is found 1 × 10-5 S/ cm at 55 °C, whereas it is 1.65 × 10-5 S/cm at 27 °C for the 5 wt% MMT incorporated NSPE film. The significantly enhanced ionic conductivity with ions transference number close to unity, high electrochemical stability voltage window and good reversibility of these NSPE materials confirm their potential applications as ion conductor/separator for the development of all-solid-state ion conducting devices and the lithium-ion batteries.

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“…This suggests that addition of SN increases the polymer flexibility and hopping of cation from one coordinating site is faster. For, ω > ωh, the two process may occur, (i) correlated forward-backward-forward hopping (unsuccessful hopping), and (ii) ion migration to the new coordinating site (successful hopping) [76][77]. The correlated forward-backward-forward hopping reflects the insufficient time to the cation to move to next coordinating site and results in dispersion in the high frequency window.…”

Section: The Real Part Of the Complex Conductivitymentioning

confidence: 99%

Tailoring the Structural, Morphological, Electrochemical, and Dielectric Properties of Solid Polymer Electrolyte

Arya¹

2018

Preprint

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Abstract:Herein, we present preparation of solid polymer electrolyte (SPE) comprising of PEO, NaPF6 and varying fraction of Succinonitrile (SN) by standard solution cast technique. The morphological features and structural properties were studied by the FESEM, XRD, respectively. FTIR was performed to study the interactions between polymer host, salt, and SN. Impedance spectroscopy, Transference number measurements, LSV and CV were used to examine the electrochemical properties. The complex permittivity/conductivity & modulus were studied to understand the dielectric properties by evaluating the dielectric strength, relaxation time, hopping frequency and dc conductivity. Based on the experimental results an interaction mechanism is presented.

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Dielectric relaxation and thermal studies on dispersed phase polymer nanocomposite films

Cited by 16 publications

References 44 publications

Highly Flexible and Visibly Transparent Poly(vinyl alcohol)/Calcium Zincate Nanocomposite Films for UVA Shielding Applications As Assessed by Novel Ultraviolet Photon Induced Fluorescence Quenching

Highly Flexible and Visibly Transparent Poly(vinyl alcohol)/Calcium Zincate Nanocomposite Films for UVA Shielding Applications As Assessed by Novel Ultraviolet Photon Induced Fluorescence Quenching

Effectively improved ionic conductivity of montmorillonite clay nanoplatelets incorporated nanocomposite solid polymer electrolytes for lithium ion-conducting devices

Tailoring the Structural, Morphological, Electrochemical, and Dielectric Properties of Solid Polymer Electrolyte

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