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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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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Engineering Segregated Structures in a Cross-Linked Elastomeric Network Enabled by Dynamic Cross-Link Reshuffling.

Qingyi Huang1, Zhenghai Tang1, Dong Wang1

  • 1Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China.

ACS Macro Letters
|May 16, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a simple method to create segregated structures in cross-linked polymers using vitrimer granules coated with carbon nanotubes (CNTs). This technique achieves excellent electrical conductivity and flexibility in the resulting polymer composites.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Segregated structures in polymer composites enhance electrical conductivity and lower percolation thresholds.
  • Creating segregated structures in thermosets is challenging due to their cross-linked nature, limiting traditional methods.
  • Existing techniques for segregated networks in cross-linked polymers are often complex and restricted to specific technologies.

Purpose of the Study:

  • To develop a straightforward method for fabricating segregated structures in covalently cross-linked networks.
  • To leverage the unique properties of vitrimers for creating advanced polymer composites.
  • To achieve enhanced electrical conductivity, reduced percolation threshold, and improved material properties.

Main Methods:

  • Utilized dynamic boronic ester-cross-linked styrene-butadiene rubber vitrimers.
  • Developed conductive filler-coated vitrimer granules by mechanically mixing with carbon nanotubes (CNTs).
  • Employed compression molding of these coated granules, utilizing vitrimer's transesterification for molecular bonding and CNT localization.

Main Results:

  • Successfully created coherently segregated polymer composites.
  • Achieved an ultralow percolation threshold for enhanced electrical conductivity.
  • Demonstrated good flexibility and inherent healing capabilities in the resulting materials.

Conclusions:

  • The proposed method offers a simple and effective approach to engineer segregated structures in cross-linked polymers.
  • This work provides a conceptual framework for creating advanced polymer composites with tailored properties.
  • The technique highlights the potential of vitrimers in developing functional materials through simple processing.