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Dual-Dynamic Chemistries-Based Fast-Reprocessing and High-Performance Covalent Adaptable Networks.

Kezhen Hu1,2, Binbo Wang1,2, Xiwei Xu1,2

  • 1Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.

Macromolecular Rapid Communications
|October 17, 2022
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Summary
This summary is machine-generated.

This study introduces fast-reprocessing covalent adaptable networks (CANs) with high performance. These sustainable materials combine rapid recyclability with excellent thermal and mechanical properties for advanced applications.

Keywords:
acetalcovalent adaptable networksdual-dynamic bondsfast reprocessinghigh performance

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Materials

Background:

  • Covalent adaptable networks (CANs) offer reprocessing, self-healing, and 3D printing capabilities, positioning them as sustainable alternatives to thermosets.
  • However, achieving rapid network rearrangement in CANs often compromises their thermal and mechanical properties and stability.

Purpose of the Study:

  • To develop fast-reprocessing CANs that maintain high performance.
  • To explore a facile strategy for constructing CANs with both rapid network rearrangement and excellent comprehensive properties.

Main Methods:

  • In situ polymerization and dynamic cross-linking of styrene (St), maleic anhydride (MA), and acetal diol (BHAD).
  • Utilizing carboxylic group-catalyzed dual dynamic ester and acetal-based networks for enhanced stress relaxation.

Main Results:

  • Successfully constructed fast-reprocessing CANs with high performance.
  • The rigid, hydrophobic polymer backbone resulted in high glass transition temperatures, mechanical strength, and water resistance.
  • Dual dynamic networks facilitated rapid stress relaxation, enabling extrusion reprocessing.

Conclusions:

  • An ingenious and simple strategy for constructing CANs with combined rapid network rearrangement and excellent performance was developed.
  • These findings are beneficial for the broader application of CANs as sustainable materials.
  • The developed CANs present a promising solution for applications requiring both recyclability and robust material properties.