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Closed-Loop Recyclable and Totally Renewable Liquid Crystal Networks with Room-Temperature Programmability and

Chenxuan Zhang1, Zhuoqiang Zhang1, Xiaokong Liu1

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.

Angewandte Chemie (International Ed. in English)
|June 26, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel, renewable azobenzene-based dynamic covalent liquid crystal network (DCv-LCN) that can be programmed at room temperature. This material allows for complete polymer-to-monomer recycling, enabling the creation of sustainable actuators and robots.

Keywords:
actuatorsazobenzeneclosed-loop recyclingdynamic covalent bondsliquid crystal networks

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Dynamic covalent liquid crystal networks (DCv-LCNs) offer programmability but are limited by heat-assisted processing and polymer-to-polymer recycling.
  • Existing methods lead to structural degradation and performance loss after repeated treatments due to thermal decomposition and interference.

Purpose of the Study:

  • To develop a fully renewable DCv-LCN with room-temperature programmability and chemical recyclability at the monomer level.
  • To demonstrate a sustainable approach for creating advanced LCN actuators and intelligent robots.

Main Methods:

  • Synthesis of an azobenzene-based DCv-LCN using dynamic imine bonds formed between dibenzaldehyde and triamine monomers.
  • Room-temperature programming triggered by water-activated imine bond dynamics.
  • Depolymerization via acid-catalyzed imine bond hydrolysis in an acid-solvent medium.
  • Recovery and regeneration of monomers for closed-loop recycling and additive reconfiguration.

Main Results:

  • A novel azobenzene-based DCv-LCN was successfully synthesized and demonstrated room-temperature programmability via water-soaking.
  • The material functions as a UV/Vis light-driven actuator.
  • Complete depolymerization to high-purity monomers was achieved at room temperature using an acid-solvent medium.
  • Recovered monomers were used to regenerate new DCv-LCNs and actuators, showcasing closed-loop recyclability and additive integration.

Conclusions:

  • A renewable, room-temperature programmable DCv-LCN with polymer-to-monomer recyclability has been developed.
  • This approach overcomes the limitations of thermal processing and degradation associated with traditional DCv-LCNs.
  • The material enables sustainable manufacturing of sophisticated actuators and robots with reconfigurable functionalities.