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Precise Carboxylic Acid-Functionalized Polyesters in Reprocessable Vitrimers.

Matilde Concilio1, Gregory S Sulley1, Fernando Vidal1

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Researchers developed reprocessable thermoset-like polymers using ring-opening copolymerization. These novel materials exhibit excellent mechanical properties and high creep recovery, overcoming traditional thermoset limitations.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Thermosets offer superior stability but lack reprocessability due to permanent cross-links.
  • Developing recyclable thermoset alternatives is crucial for sustainability.

Purpose of the Study:

  • To synthesize reprocessable polymer networks with thermoset-like properties.
  • To investigate the influence of catalyst composition on network characteristics.

Main Methods:

  • Synthesized low molecular weight polyesters via ring-opening copolymerization (ROCOP) of epoxides and succinic anhydride.
  • Formed polymer networks using diglycidyl ether of bisphenol A as a cross-linker.
  • Employed catalyst mixtures (zinc bis(2-ethylhexanoate) and 1,8-diazabicyclo(5.4.0)undec-7-ene) to control curing and dynamic bond exchange.

Main Results:

  • Achieved tunable mechanical properties (elongation at break 90%–450%, UTS 0.30–24 MPa).
  • Demonstrated high creep recovery (>90% after five cycles).
  • Confirmed good reprocessability of the synthesized polymer networks.

Conclusions:

  • The ROCOP approach enables the creation of functional polyesters for reprocessable thermoset networks.
  • Catalyst tuning offers a method to control mechanical performance and dynamic behavior.
  • This work presents a viable strategy for designing sustainable thermoset materials.