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Author Correction: Epoxy toughening through high pressure and shear rate preprocessing.

Scientific reports·2019

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Epoxy toughening through high pressure and shear rate preprocessing.

G Fernández Zapico1, Naoto Ohtake2, Hiroki Akasaka2

  • 1Mechanical Engineering Department, E. T. S. Ingenieros Industriales, Universidad Politécnica de Madrid. C/ José Gutiérrez Abascal, 2, 28006, Madrid, Spain.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Mechanical Engineering

Background:

  • Epoxy resins are widely used but often suffer from low fracture toughness.
  • Improving toughness typically compromises stiffness and strength, limiting applications.

Purpose of the Study:

  • To develop a scalable process for enhancing the fracture energy of epoxy resins.
  • To investigate the effects of high pressure and shear rate on polymer structure and mechanical properties.

Main Methods:

  • Applying high pressures (GPa) and shear rates (10^6 m^-1) to pre-cured epoxy resins.
  • Utilizing elastohydrodynamic phenomena in lubricated kinematic pairs (e.g., ball bearings).
  • Characterizing changes using SEM, Raman spectroscopy, nanoindentation, GPC, and NMR.

Main Results:

  • Substantial improvement in fracture toughness observed under specific pressure and shear rate conditions.
  • Increased polymer chain length and reduced crosslinking density were confirmed.
  • Achieved enhanced toughness while maintaining adequate stiffness and strength.

Conclusions:

  • The developed process effectively enhances epoxy resin fracture energy through controlled mechanical forces.
  • This method offers a new approach to toughening polymers without the typical trade-offs.
  • The technique holds promise for advanced material applications requiring high toughness and durability.