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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Updated: May 10, 2025

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Photobase-Catalyzed Thiol-ene Click Chemistry for Light-Based Additive Manufacturing.

Antonio Vazquez1, Xabier Lopez de Pariza2, Nathan Ballinger1

  • 1Department of Chemistry, University of Washington, Seattle, WA 98195, USA.

Polymer Chemistry
|April 24, 2025
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Summary
This summary is machine-generated.

Ionic liquid resins enable vat photopolymerization using photo-base generators to catalyze thiol-Michael additions, improving printing speed and material ductility for advanced sensors and electronics.

Keywords:
additive manufacturingionic liquidionogelphotobase generatorthiol-Michael polymerization

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Area of Science:

  • Additive Manufacturing
  • Polymer Chemistry
  • Materials Science

Background:

  • Vat photopolymerization typically uses radical-based polymerization for resin curing.
  • Non-radical reactions offer potential for new functional materials but are less explored in vat photopolymerization.
  • Existing methods have limitations in material diversity and device fabrication.

Purpose of the Study:

  • To demonstrate ionic liquid resins for vat photopolymerization using photo-base generators (PBGs).
  • To utilize thiol-Michael additions as the network-forming reaction for enhanced material properties.
  • To expand the range of chemistries available for vat photopolymerization and device fabrication.

Main Methods:

  • Development of ionic liquid resins for vat photopolymerization.
  • Catalysis of thiol-Michael addition reactions using photo-base generators (PBGs).
  • Evaluation of 2-(2-nitrophenyl)-propyloxycarbonyl tetramethylguanidine (NPPOC-TMG) as an effective PBG.
  • Comparison of mechanical properties between thiol-Michael and radical polymerized networks.

Main Results:

  • Ionic liquid resins with PBGs successfully enabled thiol-Michael addition vat photopolymerization.
  • The ionic liquid accelerated curing rates and imparted ionic conductivity to printed structures.
  • NPPOC-TMG demonstrated high effectiveness, allowing printing of 250 μm features.
  • Thiol-Michael networks exhibited improved ductility compared to radical-initiated resins.

Conclusions:

  • Ionic liquid resins and thiol-Michael additions represent a novel approach for vat photopolymerization.
  • This method expands material options and processing capabilities for additive manufacturing.
  • The developed resins show promise for fabricating functional devices like sensors with enhanced properties.