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Facile Surface Depolymerization Promotes the Welding of Hard Epoxy Vitrimer.

Le An1, Wenzhe Zhao1

  • 1State Key Laboratory for Strength and Vibration of Mechanical Structures, Department of Engineering Mechanics, Xi'an Jiaotong University, Xi'an 710049, China.

Materials (Basel, Switzerland)
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A new surface depolymerization method effectively welds hard vitrimers using significantly reduced press force. This technique enhances welding strength, making vitrimer composites easier to join with improved performance.

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Welding via bond exchange reactions enables high-quality joining.
  • Current methods face challenges with hard vitrimers, requiring high press forces.

Purpose of the Study:

  • To introduce a facile surface depolymerization strategy for welding high-performance epoxy vitrimers.
  • To reduce the high press force requirement and enhance welding strength in vitrimer composites.

Main Methods:

  • Vitrimers were depolymerized using solvent-assisted bond exchange reactions in ethylene glycol.
  • Depolymerized vitrimers were subsequently welded under optimized heat and press force conditions.
  • Investigated the impact of depolymerizing time, welding pressure, temperature, and time on welding strength.

Main Results:

  • Optimal depolymerizing time, welding pressure, and temperature were identified for maximum welding strength.
  • Welding strength increased with extended welding time.
  • Surface depolymerization significantly reduced press force (1/1000th) while increasing welding strength (1.55-times).

Conclusions:

  • Facile surface depolymerization is an effective strategy for welding hard vitrimers.
  • This method substantially lowers the required press force.
  • The approach offers a promising route for fabricating high-performance vitrimer composites.