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Multifunctional dithiolane monomers for multi-scale, recyclable light-driven additive manufacturing.

Benjamin R Nelson1,2, Jaxon T Cione1, Bruce E Kirkpatrick1,2,3

  • 1Department of Chemical and Biological Engineering, University of Colorado Boulder Boulder CO 80303 USA christopher.bowman@colorado.edu.

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This summary is machine-generated.

Researchers developed a novel tetrafunctional monomer for advanced additive manufacturing. This recyclable material enables high-resolution 3D printing with or without photoinitiators, forming adaptable networks.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Photopolymerization is crucial for additive manufacturing, enabling precise 3D object creation.
  • Developing recyclable resins with tunable properties is essential for sustainable manufacturing.

Purpose of the Study:

  • To synthesize and characterize a novel tetrafunctional monomer for light-based additive manufacturing.
  • To investigate the photopolymerization behavior and recyclability of the developed monomer.
  • To demonstrate high-resolution 3D printing capabilities using the new material.

Main Methods:

  • Synthesis of lipoic acid pentaerythritol ethoxylate, a tetrafunctional monomer with 1,2-dithiolane groups.
  • Photopolymerization studies in the presence and absence of photoinitiators.
  • Additive manufacturing using dynamic light processing and two-photon lithography.
  • Recycling of the polymerized network back to the monomer via heating and solvent dilution.

Main Results:

  • The tetrafunctional monomer successfully underwent photopolymerization, forming covalent adaptable networks with linear disulfides.
  • High-resolution 3D parts were printed, with feature sizes down to 1 μm, across scales from cm to μm.
  • The polymerized network was recycled with approximately 95% monomer recovery.
  • Repolymerization of the recovered monomer yielded nearly identical modulus evolution compared to the initial polymerization.

Conclusions:

  • A novel tetrafunctional dithiolane monomer was successfully developed for additive manufacturing.
  • The monomer enables photopolymerization with or without exogenous photoinitiators, offering versatility.
  • The resulting covalent adaptable networks are recyclable, demonstrating a sustainable approach to 3D printing resins.
  • This work advances the field of recyclable resins and multifunctional monomers for high-resolution additive manufacturing.