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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Intermolecular Forces03:13

Intermolecular Forces

58.2K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Ternary Solid Polymer Electrolytes at the Electrochemical Interface: A Computational Study.

Alejandro Rivera-Pousa1,2, José Manuel Otero-Mato1,2, Hadrian Montes-Campos1,2,3

  • 1Grupo de Nanomateriais, Fotónica e Materia Branda, Departamento de Física de Partículas, Universidade de Santiago de Compostela, Campus Vida s/n, E-15782 Santiago de Compostela, Spain.

Macromolecules
|May 20, 2024
PubMed
Summary
This summary is machine-generated.

Ternary polymer electrolytes with ionic liquids show promise for batteries. Molecular dynamics simulations reveal interfacial layering hinders Li+ mobility, but specific ionic liquids improve performance by favoring cation migration.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Polymer electrolytes offer improved battery performance but their interfacial behavior requires further investigation.
  • Understanding the electrode/electrolyte interface is crucial for advancing battery technology.

Purpose of the Study:

  • To investigate the molecular behavior of ternary polymer electrolytes at graphene-like electrode interfaces using classical molecular dynamics (MD) simulations.
  • To characterize the solvation, diffusion of Li+ ions, and polymer conformations within these electrolytes.

Main Methods:

  • Classical MD simulations were employed to study ternary polymer electrolytes (poly(ethylene oxide), lithium bis(trifluoromethanesulfonyl)imide, and ionic liquids) confined between graphene-like surfaces.
  • Analysis included radial distribution functions, coordination numbers, density profiles, and polymer structural parameters (radius of gyration, end-to-end distance).

Main Results:

  • Electrolyte layering at the interface reduces Li+ mobility perpendicular to electrodes and creates energy barriers for cation contact.
  • The type and concentration of ionic liquids significantly impact interfacial structural and dynamic properties.
  • An electrolyte with low concentrations of pyrrolidinium-based ionic liquid demonstrated superior performance, enhancing Li+ migration.

Conclusions:

  • Interfacial structure critically influences ion transport in polymer electrolytes.
  • Ionic liquid selection and concentration are key factors for optimizing electrode/electrolyte interface properties in solid-like gel electrolytes.
  • Pyrrolidinium-based ionic liquids show potential for enhancing lithium-ion battery performance.