Free volume structure at interphase region of poly (ethylene oxide)-Al2O3 nanorods composites based solid polymer electrolyte and its direct correlation with Li ion conductivity

Utpalla, P.; Sharma, Sandeep; Prakash, Jyoti; Bahadur, Jitendra; Sahu, Manjulata; Pujari, P. K.

doi:10.1016/j.ssi.2021.115840

Cited by 18 publications

(18 citation statements)

References 48 publications

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“…In last 30 years, studies on polymeric systems were significantly intensified, and knowledge of the annihilation processes in these materials has advanced. Neat amorphous − and semicrystalline ,, polymers, as well as polymer-based blends , and micro-/nanocomposites, − were analyzed with the use of the PALS technique. Relationships between the initial structure of polymeric materials and transport, thermal or thermomechanical properties were typically investigated.…”

Section: Introductionmentioning

confidence: 99%

Plastic Deformation of Polypropylene Studied by Positron Annihilation Lifetime Spectroscopy

et al. 2022

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In this work, positron annihilation lifetime spectroscopy (PALS) was used for the first time to study the plastic deformation of polypropylene. An appropriate methodological approach was proposed in order to analyze the mechanical response of polypropylene in a way similar to the in situ conditions. It was demonstrated that the intermediate lifetime expressed by the τ2 (mean positron lifetime) and σ2 (dispersion) values gives us information about the crystalline component while the longest lifetime was expressed by the τ3 (mean ortho-positronium lifetime) and σ3 (dispersion) about the “porosity” of the amorphous phase. Then, the influence of the polypropylene microstructure (thickness/perfection of lamellar crystals) and the cavitation phenomenon (cavitating/non-cavitating material) on the deformation process in the context of PALS data were analyzed/discussed. Among others, the process of relative slips of crystalline blocks within individual lamellae was detected even at very low strains. The simultaneous use of PALS and volume strain measurements confirmed the deformation-induced changes in the shape of free volume pores of the amorphous phase from isotropic (spherical) to anisotropic (ellipsoidal). The use of PALS and X-ray measurements also allowed us to estimate the initial shape of cavitation pores characterized by an aspect ratio exceeding 50.

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Section: Introductionmentioning

confidence: 99%

Plastic Deformation of Polypropylene Studied by Positron Annihilation Lifetime Spectroscopy

et al. 2022

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“…Figure 3 illustrates a potential interaction between PVA and Al 2 O 3 . As demonstrated in Figure 4 , the interaction with alumina causes a clear decrease in the PVA crystallinity [ 16 ] with an increase in the Al 2 O 3 [ 17 ] concentrations up to 0.7 wt.%. The degree of crystallinity then rises with an increase in the Al 2 O 3 particle concentration until leveling off at about 25% at 10 wt.% Al 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

Effect of Al2O3 on Nanostructure and Ion Transport Properties of PVA/PEG/SSA Polymer Electrolyte Membrane

et al. 2022

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Polymer electrolyte membrane (PEM) fuel cells have the potential to reduce our energy consumption, pollutant emissions, and dependence on fossil fuels. To achieve a wide range of commercial PEMs, many efforts have been made to create novel polymer-based materials that can transport protons under anhydrous conditions. In this study, cross-linked poly(vinyl) alcohol (PVA)/poly(ethylene) glycol (PEG) membranes with varying alumina (Al2O3) content were synthesized using the solvent solution method. Wide-angle X-ray diffraction (XRD), water uptake, ion exchange capacity (IEC), and proton conductivity were then used to characterize the membranes. XRD results showed that the concentration of Al2O3 affected the degree of crystallinity of the membranes, with 0.7 wt.% Al2O3 providing the lowest crystallinity. Water uptake was discovered to be dependent not only on the Al2O3 group concentration (SSA content) but also on SSA, which influenced the hole volume size in the membranes. The ionic conductivity measurements provided that the samples were increased by SSA to a high value (0.13 S/m) at 0.7 wt.% Al2O3. Furthermore, the ionic conductivity of polymers devoid of SSA tended to increase as the Al2O3 concentration increased. The positron annihilation lifetimes revealed that as the Al2O3 concentration increased, the hole volume content of the polymer without SSA also increased. However, it was densified with SSA for the membrane. According to the findings of the study, PVA/PEG/SSA/0.7 wt.% Al2O3 might be employed as a PEM with high proton conductivity for fuel cell applications.

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“…Polymer chain relaxation dynamics is usually masked in isothermal plots of dielectric loss due to high dc conductivity. Relaxation dynamics can be discerned by analysing the dc conduction free dielectric loss e 0 0 der À Á calculated according to eqn (6).…”

Section: Dielectric Relaxation and Ionic Conductivity: Bdsmentioning

confidence: 99%

“…The interface created on loading nanofillers in polymers provides additional pathways for ion conduction, which may yield high ionic conductivity. 6 Various studies have shown that well-oriented ion transport pathways, such as those offered by porous crystalline materials with an interconnected pore architecture, are very effective in resolving the low ionic conductivity issues in solid electrolytes. [7][8][9] In addition, nanofillers with Lewis acidic surface groups are advantageous in the enhancement of ionic conductivity in solid state electrolytes.…”

Section: Introductionmentioning

confidence: 99%

On enhancing the Li-ion conductivity of quasi-solid-state electrolytes by suppressing the flexibility of zeolitic imidazolate framework-8 via a mixed ligand strategy

Utpalla

Mor

Sharma

2023

Phys. Chem. Chem. Phys.

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Free volume structure at interphase region of poly (ethylene oxide)-Al2O3 nanorods composites based solid polymer electrolyte and its direct correlation with Li ion conductivity

Cited by 18 publications

References 48 publications

Plastic Deformation of Polypropylene Studied by Positron Annihilation Lifetime Spectroscopy

Plastic Deformation of Polypropylene Studied by Positron Annihilation Lifetime Spectroscopy

Effect of Al2O3 on Nanostructure and Ion Transport Properties of PVA/PEG/SSA Polymer Electrolyte Membrane

On enhancing the Li-ion conductivity of quasi-solid-state electrolytes by suppressing the flexibility of zeolitic imidazolate framework-8 via a mixed ligand strategy

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