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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.7K
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...
2.7K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.4K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.4K

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Related Experiment Video

Updated: Jan 3, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
05:33

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Catalyst-Free Dynamic Networks for Recyclable, Self-Healing Solid Polymer Electrolytes.

Brian B Jing, Christopher M Evans

    Journal of the American Chemical Society
    |November 20, 2019
    PubMed
    Summary

    Dynamic polymer networks show promise as solid electrolytes. Optimizing lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) content enhances conductivity and self-healing properties for sustainable energy applications.

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    Area of Science:

    • Materials Science
    • Electrochemistry
    • Polymer Chemistry

    Background:

    • Dynamic covalent polymer networks offer reprocessable and self-healing properties.
    • Their application as solid electrolytes remains limited due to challenges in optimizing ion transport and mechanical stability.

    Purpose of the Study:

    • To investigate the influence of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt concentration on ion transport and network dynamics in poly(ethylene oxide)-based dynamic polymer networks.
    • To evaluate the potential of these dynamic networks as sustainable solid electrolytes.

    Main Methods:

    • Synthesis of poly(ethylene oxide)-based polymer networks with varying LiTFSI concentrations.
    • Electrochemical impedance spectroscopy to measure ionic conductivity.
    • Rheological measurements (shear modulus, stress relaxation) to characterize mechanical properties.
    • Assessment of reprocessability and self-healing capabilities.

    Main Results:

    • Ionic conductivity reached a maximum of 3.5 × 10-4 S/cm at an optimal LiTFSI concentration.
    • LiTFSI concentration significantly impacted mechanical properties, with shear modulus ranging from 1 to 10 MPa and stress relaxation varying by two orders of magnitude.
    • The networks demonstrated efficient dissolution and healing, recovering conductivity after damage.

    Conclusions:

    • Dynamic polymer networks can be tailored with LiTFSI to achieve significant ionic conductivity.
    • These materials exhibit tunable mechanical properties and excellent self-healing capabilities, crucial for solid electrolyte applications.
    • The reprocessable and self-healing nature of these networks highlights their potential as sustainable solid electrolytes for energy storage devices.