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Related Concept Videos

Ion Exchange01:17

Ion Exchange

676
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Related Experiment Video

Updated: Sep 23, 2025

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Imine-Based Reactive Mesogen and Its Corresponding Exchangeable Liquid Crystal Elastomer.

Xueyan Lin1, Alexandra Gablier1, Eugene M Terentjev1

  • 1Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

Macromolecules
|May 16, 2022
PubMed
Summary

Researchers developed a new imine-based liquid crystalline elastomer (xLCE) enabling fast, stable bond-exchange reactions. This material exhibits vitrimer behavior, thermal stability, and reversible actuation for reprogramming applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Exchangeable liquid crystalline elastomers (xLCEs) are typically made with conventional LCEs and additional exchangeable groups.
  • Conventional LCEs often use aromatic-ester or biphenyl mesogens not optimized for fast, clean bond-exchange reactions.

Purpose of the Study:

  • To develop a novel, fast-synthesized reactive mesogen for creating xLCEs with rapid and stable bond-exchange properties.
  • To investigate the properties and potential applications of the newly synthesized imine-based xLCE.

Main Methods:

  • Synthesis of a new aromatic-imine based reactive mesogen.
  • Fabrication of imine-based xLCEs.
  • Characterization of bond-exchange kinetics and activation energy.
  • Assessment of thermal stability and recyclability.
  • Demonstration of mesogen orientation reprogramming and reversible thermal actuation.

Main Results:

  • A fast synthesis route for aromatic-imine mesogens was established.
  • The resulting imine-based xLCE exhibits vitrimer plastic-flow behavior with a low activation energy of 54 kJ/mol for bond exchange.
  • The xLCE demonstrates excellent thermal stability, allowing for multiple recycling cycles without degradation.
  • Liquid crystallinity is maintained throughout the recycling process.
  • Reversible thermal actuation was achieved through reprogramming and realignment of mesogen orientation.

Conclusions:

  • The novel imine-based xLCE offers significant advantages over conventional xLCEs due to its fast and stable bond-exchange characteristics.
  • This material is highly recyclable and thermally stable, making it suitable for sustainable material applications.
  • The ability to reprogram and realign mesogen orientation opens possibilities for advanced adaptive and responsive materials.