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Stretchable, Strong, Recyclable Helicide Elastomer Based on Dynamic Covalent Interactions.

Hafeez Ur Rehman1,2, Mikael S Hedenqvist3, Yujie Chen1

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.

ACS Applied Materials & Interfaces
|September 20, 2023
PubMed
Summary

Researchers developed a new recyclable elastomer using dynamic covalent bonds. This advanced polymer exhibits 100% self-healing in minutes and degrades in hours, offering a sustainable alternative to traditional plastics.

Keywords:
degradableelastomersheliciderecyclableself-healing

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Current synthetic polymer production and disposal methods are unsustainable.
  • Dynamic covalent bonds offer a reversible feature for designing advanced molecular structures.
  • These bonds enable the creation of recyclable and mechanically interlocked materials.

Purpose of the Study:

  • To develop a novel helicide-based elastomer network.
  • To incorporate self-healing, recycling, and degradation capabilities into the elastomer.
  • To address the limitations of current unsustainable polymer technologies.

Main Methods:

  • Synthesis of a helicide-based elastomer network utilizing dynamic covalent bonds.
  • Evaluation of self-healing properties under various solution conditions (H2O, HCl, NaOH).
  • Assessment of hydrolytic degradation rates based on binding type, pH, and copolymer network.
  • Testing of mechanical properties after multiple recycling cycles.

Main Results:

  • Achieved 100% self-healing performance within 10-20 minutes.
  • Mechanical properties ranged from 1-1.4 MPa under tested conditions.
  • Hydrolytic degradation occurred within 4-11 hours, depending on specific parameters.
  • Material retained good mechanical properties after five consecutive recycling cycles.

Conclusions:

  • The developed helicide-based elastomer demonstrates significant self-healing, degradation, and recycling capabilities.
  • The material offers a promising sustainable alternative for polymer applications and packaging.
  • The reversible nature of dynamic covalent bonds is key to achieving these desirable material properties.