Nirali Gondaliya

Conductivity relaxation in Ag + ion conducting PEO-PMMA-PEG polymer blends

In this paper, the electrical conductivity and relaxation studies in two different temperature regions (T < Tm and T > Tm) on plasticized PEO–PMMA blend polymer electrolyte system with AgNO3 salt are reported. The polymer electrolyte system has been prepared by solution cast technique and characterized by X-ray diffraction and differential scanning calorimetry. The conduction and relaxation processes at various temperatures have been investigated in the framework of modulus formalism. The distribution of relaxation times is discussed using Argand plot. Variation in ionic conductivity of polymer blends is discussed with the increase of PEO as well as with temperature.

Effect of ethylene carbonate concentration on structural and electrical properties of PEO–PMMA polymer blends

Polyethylene oxide–polymethyl methacrylate (PEO–PMMA) polymer blend electrolyte system complexed with silver salt having different ethylene carbonate (EC) concentrations was prepared using solution cast technique. Complex formation and change in structural and microstructural properties have been studied by X-ray diffraction, Fourier transform infrared, and scanning electron microscopy analysis. The thermal properties of polymer films have been examined by the differential scanning calorimetry technique. Addition of plasticizer is observed to lower melting temperature. Electrical response of polymer films has been measured as a function of EC concentration and temperature using complex impedance spectroscopy. Complex impedance data are used to analyze the conductivity, permittivity, and modulus formalism to understand the conduction mechanism. The temperature dependence of electrical conductivity of polymer electrolytes shows a sudden rise at the melting temperature of PEO.

Conductivity and Dielectric Behavior of AgCF3SO3 Doped PEO Polymer Films

PEO containing AgCF3SO3 polymer films have been prepared by the hot press technique. The effect of salt concentration on the frequency-dependent conductivity properties of PEO: AgCF3SO3 complexes are investigated by impedance spectroscopy in the temperature range from 303 K to 328 K. The ac conductivity and dielectric properties of the prepared samples have been analyzed. The ac conductivity obeyes the universal power law and as the temperature increases, the feature of σ(ω) α ωn is more predominant. The dielectric permittivity is found to increase with temperature of the prepared samples. The imaginary part of electrical modulus, M” shows the formation of dispersion peak. Relaxation times for the ionic charges carriers were extracted from the peak maxima of imaginary part of modulus at various temperatures. The plot of relaxation times as a function of temperature shows Arrhenius type behavior.

Conductivity Studies on Filler Free and Filler Doped PVA-PEO Based Blend Polymer Electrolytes

The present study deals with the investigation of conduction behavior of filler free and filler based blend electrolyte system. The polymer blend films consisting of PVA and PEO doped with silver salt and PEG plasticizer, are prepared using solution cast technique. The filler free system is prepared for varying ratios of host polymers (PVA: PEO); whereas the filler based system is prepared with various Al2O3 concentrations in the blend films. The conductivity studies of prepared samples are carried out using impedance spectroscopic analysis. The conductivity for the filler free blend system is found to increase with increasing amount of PEO in all the blend specimens. On the other hand, the filler based system shows the conductivity enhancement upto 6wt% which mitigates with further addition of filler into the electrolytes. The DSC scans are found to support the conductivity results.

Characterization studies of plasticized PEO-PMMA nano-composite polymer electrolyte system

Present study reports the characterization studies on silver based PEO-PMMA-PEG nano composite polymer electrolyte system, prepared by solution cast technique. The complexation among various constituents of polymer samples was carried by XRD and FTIR analysis. Thermal analysis of the samples was carried out by DSC study.

Dielectric And Conductivity In Silver‐Poly (ethylene oxide) Solid Polymer Electrolytes Dispersed With SiO2 Nanoparticles

Thin solid polymer electrolytes based on poly‐ethylene oxide (PEO) and silver triflate (AgCF3SO3) dispersed with nanoparticles (SiO2) have been prepared by solution casting technique. Electrical properties of PEO—AgCF3SO3‐SiO2 system were investigated by impedance spectroscopy. Further from impedance spectroscopy quantity such as complex dielectric constant and loss tangent were computed. Conductivity was studied for prepared films and the results are discussed.

Effect of EC & LiCF3SO3 on conductivity and relaxation in PVA-PEO blends

PVA-PEO-EC-LiCF3SO3 blend system has been prepared using solution cast technique wherein, plasticizer (Ethylene Carbonate (EC)) and salt (Lithium Trifluoromethanesulfonate (LiCF3SO3)) concentrations are varied. The conductivity studies are carried out using impedance spectroscopic analysis. The relaxation time is obtained using frequency dependent (Z“/Z“max) plot. A comparative study between conductivity (σ) and conductivity relaxation time (τ) has been carried out.

Effect of swift heavy ion irradiation on conductivity and relaxation time in PVA-PEO-EC-LiCF{sub 3}SO{sub 3} blends

In the present work, the PVA-PEO-EC-LiCF3SO3 blend specimens complexed with 3 wt% LiCF3SO3 salt have been irradiated, using swift heavy O7+ ion irradiation of 80MeV. These blend films have been irradiated with four different fluences ranging from 1×1011 to 3×1012 ions/cm2. Effect of radiations on conductivity, power law exponent and relaxation time of the films has been investigated in the present study. Conductivity is observed to enhance on increasing the fluence upto 3×1011 ions/cm2 and drops with further increment of fluence. However, all the irradiated blend specimens show higher conductivity as compared to pristine blend specimen.

Effect of Al2O3 and PEG on relaxation time in PEO-LiCF3SO3 polymer electrolytes

PEO-LiCF3SO3-Al2O3-PEG systems; one with varying amount of plasticizer and other with different amount of filler concentration were prepared using solution cast technique. The relaxation times derived from electrical modulus and ionic conductivity were compared in both the systems. Impedance spectroscopy has been used to study the effect of filler and plasticizer on conduction process at different temperatures from 303 to 323K and in the frequency range of 3.2MHz to 10Hz.

Conductivity Studies in PVA‐PEO‐PEG Blended Polymer Films Complexed with Silver Salt

The PVA‐PEO blended polymer films complexed with silver nitrate salt and PEG plasticizer were prepared by solution cast technique. The prepared polymer films are characterized by XRD, DSC and impedance spectroscopy. The electrical properties of the blended plasticized polymer films have been discussed.