Prajakta Joge

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.

The Consequence of LiCF3SO3 Concentrations and Swift Heavy O7+ Ion Irradiation on Thermal, Electrical and Relaxation Properties of [PVA(47)-PEO(47)-EC(6)-LiCF3 SO3(x)] Blend Electrolyte System

The blend specimens of [PVA (47) -PEO (47) -EC (6) -(LiCF 3 SO 3 )x] system are prepared for x = 3 to 11 wt % using solution cast technique. Portions of these blend films are exposed to swift heavy O 7+ ion radiations. Changes taking place in thermal, electrical and relaxation properties at various LiCF 3 SO 3 salt concentrations of all the blend specimens prior and after irradiation are thoroughly investigated. Relaxation time τ and Kohlrausch-William-Watts exponent β which throw light on the relaxation dynamics of the blend samples are calculated using modulus formalism. For both, prior as well as after irradiation, all these properties are found to be optimum at 9 wt% of salt concentration. However, irradiation has led to a significant enhancement in these properties of the blends at all salt concentrations. Scaling of modulus is carried out to analyse time-composition superposition principle. Relaxation dynamics is observed to be independent of salt concentration in cases of both, pristine and irradiated blends.

Conductivity enhancement in PVA−PEO−EC−LiCF−3SO3blends upon swift heavy O7+ion irradiation

In the present study, the PVA − PEO − EC − LiCF − 3 SO 3 blend system was prepared using solution cast technique. The system was prepared by taking 5 different concentrations LiCF 3 SO 3 in the range of 3wt% to 11 wt%, at a fixed proportion of the rest of the constituents. These blend films had been exposed to O 7+ radiations of 80 MeV at a current of 1pnA at a fluence of 1×1012 ions/cm2. The conductivity variation of the specimens is investigated using impedance spectroscopy wherein; the conductivity enhances drastically upon irradiation at all the concentrations of salt. The thermal characteristics of the blend films are being studied using Differential Scanning Calorimetry.

Effect of Al2O3 on crystallinity and conductivity of PVA−PEO−EC−LiCF3SO3 blend electrolyte system

In the present study, the PVA−PEO−EC−LiCF3SO3 polymer electrolytes are prepared using solution cast technique for different concentrations of Al2O3 ranging from 2 to 10 wt%. The study deals with the investigation of the influence of Al2O3 concentration on the electrical properties and crystallinity of the polymer electrolytes. The conductivity studies are carried out using impedance spectroscopic analysis and the variation in crystallinity is investigated using XRD technique.

Conductivity enhancement in PVA−PEO−EC−LiCF−3SO3 blends upon swift heavy O7+ ion irradiation

In the present study, the PVA − PEO − EC − LiCF − 3 SO 3 blend system was prepared using solution cast technique. The system was prepared by taking 5 different concentrations LiCF 3 SO 3 in the range of 3wt% to 11 wt%, at a fixed proportion of the rest of the constituents. These blend films had been exposed to O 7+ radiations of 80 MeV at a current of 1pnA at a fluence of 1×1012 ions/cm2. The conductivity variation of the specimens is investigated using impedance spectroscopy wherein; the conductivity enhances drastically upon irradiation at all the concentrations of salt. The thermal characteristics of the blend films are being studied using Differential Scanning Calorimetry.

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.