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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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...
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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Ion conduction in the comb-branched polyether electrolytes with controlled network structures.

Lu Xu1, Wei Wei1, Donglei You1

  • 1Department of Polymer Science, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China. hmxiong@sjtu.edu.cn.

Soft Matter
|February 11, 2020
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Summary
This summary is machine-generated.

Centipede-like polyether solid polymer electrolytes with tunable network structures exhibit high ionic conductivity, outperforming linear polymers. Optimized network design enhances lithium-ion transport for advanced battery applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Solid polymer electrolytes (SPEs) are crucial for safe and efficient lithium-ion batteries.
  • Traditional linear poly(ethylene oxide) (PEO) based SPEs suffer from low ionic conductivity.
  • Developing novel polymer architectures is key to overcoming limitations of current SPEs.

Purpose of the Study:

  • To synthesize and characterize novel centipede-like polyether SPEs.
  • To investigate the effect of network mesh size on ionic conductivity and ion transport mechanisms.
  • To explore the potential of these SPEs for high-performance lithium-ion battery electrolytes.

Main Methods:

  • Synthesis of comb-branched polyethers with ethylene oxide (EO) brushes and allyl groups.
  • In situ crosslinking using thiol-ene 'click' chemistry to form polymer networks.
  • Characterization of network mesh sizes via equilibrium swelling and Flory-Rehner theory.
  • Measurement of ionic conductivity and temperature dependence using electrochemical impedance spectroscopy.
  • Analysis of ion transport mechanisms using the Vogel-Tammann-Fulcher (VTF) equation.

Main Results:

  • Achieved precise control over network mesh sizes by tuning polymer composition and crosslinker length.
  • Synthesized SPEs demonstrated high ionic conductivity (up to 1.6 × 10-4 S cm-1 at room temperature), significantly higher than linear PEO.
  • Increased mesh size led to higher conductivity, reduced ion pairing, and enhanced free ion content.
  • Observed good compatibility with lithium anodes.
  • Demonstrated potential to alleviate the trade-off between activation energy and ion carrier concentration.

Conclusions:

  • Centipede-like polyether SPEs with controlled network structures offer a promising alternative to linear PEO.
  • Optimized network architecture, particularly larger mesh sizes, enhances ionic conductivity and lithium-ion transport.
  • These novel electrolytes provide a viable platform for developing high-performance and safer solid-state batteries.