Polymer–ion–clay interaction based model for ion conduction in intercalation-type polymer nanocomposite

Sharma, Abhishek; Thakur, Awalendra K.

doi:10.1007/s11581-009-0394-5

Cited by 38 publications

(22 citation statements)

References 33 publications

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“…1 and 2) shows that the ε′ and ε″ values of PNCEs-PT are different from that of PNCEs-ST films, which confirms that the synthesis of (PEO) 20 -NaClO 4 -x wt.% MMT clay electrolyte materials at melting temperature of PEO and NaClO 4 ·H 2 O resulted the change in their dipolar and free ions contribution to the dielectric polarization. Several attempts on polymer-MMT clay nanocomposites (PCNs) have established that the comparative changes in ε′ values with increase of clay loading in PCNs have strong correlation with the intercalated and exfoliated structures of MMT clay in the polymer matrix [9][10][11][12][13][14][25][26][27][28][29][30][31]. In general, nanoscale dispersed clay in the polymer matrix forms hybrid structures (both intercalated and exfoliated), but their dominate state governs the increase or decrease in ε′ values as compared to that of the pure polymer matrix [29][30][31].…”

Section: Measurementsmentioning

confidence: 99%

Effect of melt compounding temperature on dielectric relaxation and ionic conduction in PEO–NaClO4–MMT nanocomposite electrolytes

Sengwa

Sankhla

Choudhary

2010

Ionics

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Polymer nanocomposite electrolytes (PNCEs) of poly(ethylene oxide) and sodium perchlorate monohydrate complexes with montmorillonite (MMT) clay up to 20 wt. % MMT concentration of poly(ethylene oxide) (PEO) are synthesized by melt compounding technique at melting temperature of PEO (∼70°C) and NaClO 4 monohydrate (∼140°C). Complex dielectric function, electric modulus, alternating current (ac) electrical conductivity, and impedance properties of these PNCEs films are investigated in the frequency range 20 Hz to 1 MHz at ambient temperature. The direct current conductivity of these materials was determined by fitting the frequency-dependent ac conductivity spectra to the Jonscher power law. The PNCEs films synthesized at melting temperature of NaClO 4 monohydrate have conductivity values lower than that of synthesized at PEO melting temperature. The complex impedance plane plots of these PNCEs films have a semicircular arc in upper frequency region corresponding to the bulk material properties and are followed by a spike in the lower frequency range owing to the electrode polarization phenomena. Relaxation times of electrode polarization and ionic conduction relaxation processes are determined from the frequency values corresponding to peaks in loss tangent and electric modulus loss spectra, respectively. A correlation is observed between the ionic conductivity and dielectric relaxation processes in the investigated PNCEs materials of varying MMT clay concentration. The scaled ac conductivity spectra of these PNCEs materials also obey the ac universality law.

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Section: Measurementsmentioning

confidence: 99%

Effect of melt compounding temperature on dielectric relaxation and ionic conduction in PEO–NaClO4–MMT nanocomposite electrolytes

Sengwa

Sankhla

Choudhary

2010

Ionics

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“…So, on increase of clay concentration, the ionic conductivity increases which is already observed in the ac conductivity analysis. An increase in the free anion fraction in the PNC films confirm enhanced ion dynamics due to an effective interaction among composite components [32].…”

Section: Discussionmentioning

confidence: 73%

AC conductivity and relaxation behavior in ion conducting polymer nanocomposite

Sharma

Thakur

2010

Ionics

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We report the ac conductivity and relaxation behavior analysis for a heterogeneous polymer-clay nanocomposite (PNC) having composition (polyacrylonitrile) 8 LiCF 3 SO 3 +x wt.% dodecylamine modified montmorillonite. Charge transport behavior in an ionically conducting PNC has been analyzed systematically and correlated with the macroscopic parameters like polymer glass transition temperature and available free mobile charge carriers. Intercalation of cation coordinated polymer into the nanometric clay channels has been confirmed by high-resolution transmission electron microscopy. The electrical properties of the intercalated PNC films have been studied using complex impedance/admittance spectroscopy. Excellent correlation of relaxation behavior with polymer glass transition temperature (T g ) confirmed the objectives of the work. An analysis of dielectric relaxation indicates that PNC films are lossy when compared with polymer-salt film. This result is a direct outcome of faster ion dynamics leading to strong electrode polarization effect due to the accumulation of charge carriers at the interface.

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“…In Figure 9 it may be noticed that at low-frequency rapid increase in ′ is observed attributed to the accumulation of the charge at the electrode/electrolyte interface [56]. While at the high frequency, a decrease in dielectric constant is observed with the increase of frequency.…”

Section: Electrochemical Stability Windowmentioning

confidence: 90%

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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Polymer–ion–clay interaction based model for ion conduction in intercalation-type polymer nanocomposite

Cited by 38 publications

References 33 publications

Effect of melt compounding temperature on dielectric relaxation and ionic conduction in PEO–NaClO4–MMT nanocomposite electrolytes

Effect of melt compounding temperature on dielectric relaxation and ionic conduction in PEO–NaClO4–MMT nanocomposite electrolytes

AC conductivity and relaxation behavior in ion conducting polymer nanocomposite

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

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