Characterization and electrical properties of polyvinyl alcohol based polymer electrolyte films doped with ammonium thiocyanate

Kulshrestha, N.; Chatterjee, B.; Gupta, Pankaj

doi:10.1016/j.mseb.2014.01.012

Cited by 39 publications

(14 citation statements)

References 40 publications

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“…The natrite forms through the reactions shown in Equations 1 01-0990). However, the absence of peaks corresponding to thiocyanate determines complete dissolution or decomposition, which is in agreement with the finding of literature [24,25]. The obvious characteristic diffraction peaks of tridymite and quartz derive from the transformation of fumed silica.…”

Section: Tg/dscsupporting

confidence: 92%

“…The natrite forms through the reactions shown in Equations (1)-(3), firstly the NH4SCN reacts with the OH − and produces NH3, S 2− , and CO3 2− , following by the formation of sodium sulfite via oxidizing reaction between the S 2− and O2 derived from air, finally partial sodium sulfite is oxidized further and transfers into sodium sulfate. SCN − can transform into S 2− , CO2, and NH4 + under acid environment via a reduction reaction [24]. However, the hump of amorphous silicate covers the spectra of Na2CO3, Na2SO3, and Na2SO4, because of their low contents in XRD patterns.…”

Section: Tg/dscmentioning

confidence: 99%

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Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood

Wang

Zhao

2019

Coatings

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An ecological ammonium thiocyanate (NH4SCN)-modified geopolymeric coating was facilely prepared for flame-retarding plywood. The effect of NH4SCN on the flame resistance was preliminarily investigated using cone calorimeter (CC), scanning electron microscope (SEM), X-ray diffraction (XRD), and thermal gravimetry (TG). The results show that 1 wt.% NH4SCN as dopant is of paramount importance to generate a compact and continuous coating. The formation of a smooth, intact, and uniform-swelling siliceous layer during combustion facilitates enhanced fire resistance, evidenced by the increased fire performance index (FPI), reduced fire growth index (FGI), and 39.7% decreased value of peak heat release rate (pHRR), in comparison to those of the sample without NH4SCN. Because of the reducibility of O2-consuming NH4SCN, the compact shielding-layer containing carbonate and sulfate, as well as the release of NH3, the NH4SCN-modified geopolymeric coating exerts an enhancement on the flame-retardant efficiency.

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Section: Tg/dscsupporting

confidence: 92%

Section: Tg/dscmentioning

confidence: 99%

Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood

Wang

Zhao

2019

Coatings

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“…At lower frequencies, tan δ increases with increasing frequency as a result of the active element (ohmic) which is more dominant than the reactive element (capacitive). At higher frequencies (~MHz), tan δ decreases with increasing frequency because the reactive element grows in proportion to the frequency and also the ohmic element is independent of frequency [46]. The observed well-defined peak separates the electrode polarization and bulk relaxation processes of the material.…”

Section: Loss Tangent (Tan δ) Analysismentioning

confidence: 91%

“…This result suggests that the charge carriers responsible for both conductivity and relaxation are the same. relaxation time (η) can be evaluated by [46] 2πf max η= 1…”

Section: Loss Tangent (Tan δ) Analysismentioning

confidence: 99%

Electrical properties of biodegradable poly(ɛ-caprolactone): lithium thiocyanate complexed polymer electrolyte films

Ravi

Tang

et al. 2015

Materials Science and Engineering: B

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Lithium ion conducting polymer electrolyte films based on biodegradable poly(εcaprolactone) (PCL) complexed with lithium thiocyanate (LiSCN) salt were prepared by solution cast technique. Thermal and electrical properties of the polymer electrolyte films were studied using differential scanning calorimetry (DSC) and AC impedance spectroscopy. In order to investigate the ion conduction mechanism and relaxation behavior of complex polymer electrolyte films, the conductivity, dielectric constant, loss tangent and electric modulus were analyzed as a function of frequency and temperature. The variation of conductivity with frequency obeyed the Johnscher"s power law. The dielectric constant exhibited a higher value at a lower frequency and increased with rising temperature due to the polar nature of host polymer. The activation energies for both DC conductivity and relaxation had the same value (~0.87 eV), implying that the charge carriers responsible for both conduction and relaxation were the same.

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“…PVA is also a nontoxic and water soluble polymer. It has a strong film forming ability with very high dielectric strength, good charge storage capacity, high mechanical tensile strength, and optical properties [5,6]. Doping of transition metal salts into permanently polarized vinyl polymers like PVA in a multiphase system can induce pronounced changes in various properties of complexes [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of Erbium Ions on the Optical and Structural Properties of Polyvinyl Alcohol

Hamdalla

Hanafy

Bekheet

2015

Journal of Spectroscopy

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Polyvinyl alcohol (PVA) films doped with erbium chloride (ErCl 3 ) have been prepared by casting from their aqueous solutions. The structure of the doped samples as well as the interactions between the host PVA and Er +3 was investigated using FTIR spectroscopy. The optical measurement was recorded at room temperature in the range from 200 nm to 2000 nm. FTIR measurements revealed that Er +3 forms complex configuration within the PVA structure. PVA doped with 9 wt% of ErCl 3 exhibits energy gap and refractive index of 5.1 eV and 1.72, respectively. The effect of the doping increment of ErCl 3 on the optical parameters has been discussed.

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Characterization and electrical properties of polyvinyl alcohol based polymer electrolyte films doped with ammonium thiocyanate

Cited by 39 publications

References 40 publications

Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood

Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood

Electrical properties of biodegradable poly(ɛ-caprolactone): lithium thiocyanate complexed polymer electrolyte films

Influence of Erbium Ions on the Optical and Structural Properties of Polyvinyl Alcohol

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