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PhotoROMP: The Future Is Bright.

Andrew J Greenlee1, Raymond A Weitekamp2, Jeffrey C Foster3

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Photocontrolled ring-opening metathesis polymerization (ROMP) offers precise control for additive manufacturing. Future research should focus on improving catalyst reversibility and polymer morphology tuning for advanced material properties.

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Area of Science:

  • Polymer Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Light-controlled catalysis, particularly photochemistry, offers advantages in energy efficiency, temporal/spatial control, and selectivity over traditional thermal methods.
  • Ring-opening metathesis polymerization (ROMP) has been significantly advanced by light-induced activation and deactivation, broadening applications in additive manufacturing (AM).

Purpose of the Study:

  • To explore trends in photocontrolled ROMP systems, focusing on photoinduced activation and deactivation of metathesis catalysts.
  • To highlight underexplored areas such as metal-free, photophysical, and living ROMP systems.
  • To identify future research directions for optimizing photocontrolled ROMP.

Main Methods:

  • Review of recent advancements in photosensitive metathesis catalyst systems for ROMP.
  • Analysis of strategies for photoinduced catalyst activation and deactivation.
  • Examination of approaches for controlling polymer morphology via light stimuli.

Main Results:

  • A variety of commercial and synthetic photosensitive catalyst systems for ROMP have been developed.
  • Current research shows limited attention to precise polymer morphology control using light.
  • Metal-free, photophysical, and living ROMP systems remain relatively underexplored.

Conclusions:

  • Photocontrolled ROMP is a promising technique for advanced additive manufacturing.
  • Future efforts should prioritize enhancing the reversibility of catalyst activation/deactivation.
  • Further development is needed in photocontrolled methods for tuning cross-link density and polymer tacticity.