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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

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The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
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Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

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Bond Polarity
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Updated: Jul 1, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Correlation between Ionic Conductivity and Mechanical Properties of Solid-like PEO-based Polymer Electrolyte.

Agathe Naboulsi1,2,3, Ronan Chometon2,3,4, François Ribot2

  • 1LPPI, CY Cergy Paris Université, F-95000 Cergy, France.

ACS Applied Materials & Interfaces
|March 11, 2024
PubMed
Summary
This summary is machine-generated.

This study explores poly(ethylene glycol)-based polymer networks for solid-state lithium batteries. Higher polymer flexibility and lower cross-linking density enhance ionic conductivity, crucial for battery performance.

Keywords:
cross-linked polymer networkmechanical propertiessingle ion conductorsolid polymer electrolytetransport number

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Poly(ethylene glycol) methyl ether methacrylate polymer networks (PEO-based networks) are promising electrolytes for Li-metal all solid-state batteries.
  • Enhancing the understanding of their physicochemical characteristics is crucial for meeting Li battery electrolyte requirements.

Purpose of the Study:

  • Investigate the impact of cross-linking density and ethylene oxide/lithium ratio on mechanical properties and ionic conductivity of PEO-based networks.
  • Correlate ionic conductivity with mechanical properties for optimized solid polymer electrolytes (SPEs) and single-ion SPEs (si-SPEs).

Main Methods:

  • Synthesized cross-linked PEO-based polymers (si-SPEs and SPEs) using solvent-free radical copolymerization.
  • Utilized lithium 3-[(trifluoromethane)sulfonamidosulfonyl]propyl methacrylate (LiMTFSI), poly(ethylene glycol)methyl ether methacrylate (PEGM), and poly(ethylene glycol) dimethacrylate (PEGDM).
  • Incorporated LiTFSI as the ionic species in SPEs.

Main Results:

  • Most synthesized polymer films were amorphous, self-standing, flexible, homogeneous, and thermally stable.
  • A strong correlation was observed between ionic conductivity and mechanical properties in both SPE and si-SPE series.
  • Ionic conductivity increased with decreasing glass transition temperature, α relaxation temperature, and storage modulus.

Conclusions:

  • Li+ transport is significantly influenced by polymer chain flexibility and Li+/EO interaction.
  • Reduced mechanical rigidity and increased chain mobility in PEO-based networks enhance ionic conductivity.
  • These findings provide insights for designing advanced solid polymer electrolytes for Li-metal batteries.