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Spiroborate-Linked Ionic Covalent Adaptable Networks with Rapid Reprocessability and Closed-Loop Recyclability.

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Researchers developed novel ionic covalent adaptable networks (ICANs) using spiroborate chemistry. These materials offer rapid reprocessability and closed-loop recyclability, demonstrating potential for sustainable polymer development.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Covalent adaptable networks (CANs) combine thermoset strength with thermoplastic reprocessability.
  • Dynamic covalent bonds enable CANs to be reshaped under external stimuli.
  • Ionic polymers (ionomers) possess unique properties due to ionic groups.

Purpose of the Study:

  • To introduce the first ionic covalent adaptable networks (ICANs) based on negatively charged backbones.
  • To explore the reprocessability and recyclability of these novel ICANs.
  • To demonstrate the utility of spiroborate chemistry in creating dynamic ionic linkages.

Main Methods:

  • Synthesis of two ICANs with varying backbone compositions using spiroborate chemistry.
  • Evaluation of reprocessability by heating mechanically fractured samples.
  • Assessment of chemical recyclability through acid treatment to recover monomers.

Main Results:

  • The synthesized ICANs exhibited rapid reprocessability at 120 °C within 1 minute, with nearly 100% recovery of mechanical properties.
  • Closed-loop chemical recycling was achieved using dilute hydrochloric acid at room temperature, yielding monomers in near-quantitative amounts.
  • Spiroborate linkages proved effective as dynamic ionic crosslinks for ionomer thermosets.

Conclusions:

  • Spiroborate chemistry enables the creation of reprocessable and recyclable ionomer thermosets (ICANs).
  • These ICANs offer a promising route towards sustainable materials with enhanced performance and end-of-life options.
  • The developed ICANs represent a significant advancement in the field of dynamic polymer networks.