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One-Time Network Rearrangement for Homogenization of Epoxy Resin Structures.

Kazuma Kumamoto1, Atsuomi Shundo2, Satoru Yamamoto3

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Summary
This summary is machine-generated.

This study introduces a novel epoxy resin with a rearrangeable network. Introducing disulfide bonds allows for post-curing network homogenization, enhancing fracture energy and thermal stability.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Chemical Engineering

Background:

  • Epoxy resins are brittle due to their highly cross-linked, glassy state at room temperature.
  • This inherent brittleness limits their practical applications.
  • Controlling network heterogeneity is crucial for improving fracture behavior.

Purpose of the Study:

  • To develop a novel epoxy resin system with a one-time rearrangeable network.
  • To reduce structural heterogeneity in cured epoxy resins after the curing process.
  • To enhance the fracture toughness of epoxy resins.

Main Methods:

  • Synthesized an epoxy resin incorporating disulfide bonds within the epoxy-amine network.
  • Utilized disulfide exchange reactions for network homogenization.
  • Employed thermal annealing to trigger disulfide exchange and a subsequent fixing reaction involving terminal double bonds.

Main Results:

  • The annealed resin showed reduced dynamic heterogeneity and an increased glass transition temperature.
  • A narrower distribution of relaxation times was observed in the annealed resin.
  • The annealed resin exhibited significantly higher fracture energy compared to a reference without disulfide bonds.

Conclusions:

  • A novel epoxy resin system capable of post-curing network rearrangement was successfully developed.
  • Reducing network heterogeneity after curing enhances mechanical properties like fracture energy.
  • This approach offers a pathway to design advanced thermosetting resins with improved performance and stability.