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Closed-Loop Recyclable and Extrusion Reprocessable Thermosets Enabled by Guanylthiourea Structure.

Zhen Yu1,2, Yanlin Liu3, Xiangyu Zhou3

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Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 18, 2024
PubMed
Summary

This study introduces a novel recyclable thermoset plastic using a guanythiourea (GTUH) network. This material offers efficient recycling via extrusion or hot pressing, maintaining or improving mechanical properties for a circular economy.

Keywords:
closed‐loop recyclablecompositesdynamic covalent polymerextrusionguanylthiourea

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Chemistry

Background:

  • Thermoset plastics pose significant waste management challenges due to their non-recyclable nature.
  • Developing recyclable thermosets is crucial for advancing sustainable waste management and circular economy principles.

Purpose of the Study:

  • To report a novel thermoset network based on guanythiourea (GTUH) structure designed for enhanced recyclability.
  • To investigate the recycling mechanisms and mechanical property retention of the developed GTUH network.

Main Methods:

  • Synthesized a thermoset network by hybridizing thiourea and guanidine urea structures.
  • Investigated dual dissociative dynamic exchange reactions and hydrogen bonding interactions.
  • Evaluated recycling efficiency through continuous extrusion and hot pressing methods.
  • Assessed mechanical properties of the recycled material.

Main Results:

  • The GTUH network exhibits rapid relaxation ability due to dual dynamic exchange reactions and hydrogen bonding.
  • Recycling is achievable via continuous extrusion or brief hot pressing (5 min at 140 °C, 10 MPa).
  • Thiourea's oxidation enhancement mechanism maintains or improves mechanical properties after recycling.
  • Closed-loop chemical recycling is feasible due to the dynamic reactions within the guanythiourea structure.

Conclusions:

  • The developed GTUH network offers a viable solution for thermoset plastic recycling.
  • The material demonstrates potential for applications in recyclable composites and contributes to resource circularity.