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Toughening and Imparting Deconstructability to 3D-Printed Glassy Thermosets with "Transferinker" Additives.

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Summary

Researchers developed "transferinkers" to enhance the toughness and deconstructability of 3D-printed thermosets. These additives improve material performance and enable easier end-of-life recycling for acrylic thermosets.

Keywords:
3D printingRAFTdegradablenetwork topologyphotopolymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Thermoset materials often exhibit a trade-off between toughness and deconstructability.
  • Improving both properties simultaneously is challenging without compromising mechanical integrity.
  • This limitation hinders the extended use and end-of-life management of thermosets.

Purpose of the Study:

  • To introduce a novel strategy for enhancing toughness and deconstructability in photopolymer thermosets.
  • To investigate the impact of specific additives on the mechanical and chemical properties of 3D-printed materials.
  • To provide a method for improving the sustainability of acrylic thermosets.

Main Methods:

  • Incorporation of bis-acrylate "transferinkers" (cross-linkers with degenerative chain transfer capabilities) into photopolymer resins.
  • Characterization of mechanical properties (tensile toughness, Young's modulus, tensile strength) and thermal properties (glass transition temperature).
  • Assessment of triggered chemical deconstructability via solvolysis.

Main Results:

  • Addition of 5-25 mol% transferinkers significantly improved tensile toughness and enabled triggered chemical deconstructability.
  • Minimal negative impact on Young's modulus, tensile strength, and glass transition temperature was observed.
  • A topological transition to uniform, star-like networks with fewer dangling ends was identified as the underlying mechanism.

Conclusions:

  • Transferinkers offer a simple and effective approach to enhance photopolymer thermoset properties.
  • This strategy improves material durability and provides a pathway for controlled deconstruction.
  • The findings facilitate more sustainable applications of 3D-printed thermosets.