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Description:

Various fillers and thermoplastics are often added to thermoset epoxies to improve toughness, but this may compromise their other properties or make synthesis difficult. In this study, brittle crosslinked epoxy networks are significantly toughened through in-situ polymerization of epoxy using piperazine, which reacts at moderately low temperatures in a catalyst-free one-pot method. Dynamic mechanical properties and nanoscale morphology suggest the mechanism for improved toughness is higher yielding near the crack tip due to increased molecular weight between crosslinks. The resulting toughness is higher than any other unfilled all-epoxy materials found in the literature.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Thermoset epoxy, Thermoplastic epoxy, Fracture toughness, Piperazine

Date published: 2023-01-03

Publisher: Elsevier BV

Journal:

• MATERIALS LETTERS (ISSN: 0167577X) vol. 335 p. 133821-133821

Funding:

• JSPS Grant-in-Aid for Young Scientists (KAKENHI) (Understanding the Relationship between Polymer Structure and Creep Deformation/Failure by Multiscale Analysis)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4281

First published URL: https://doi.org/10.1016/j.matlet.2023.133821

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Updated at: 2025-01-04 12:30:33 +0900

Published on MDR: 2025-01-04 12:30:33 +0900