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Thioxanthone Skeleton-Based One-Component Macro-Photoinitiator Reduces Oxygen Inhibition and Migration Through

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|August 28, 2025
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Summary

This study introduces a novel macromolecular photoinitiator (PPI) to overcome oxygen inhibition and micromolecule migration in radical photocuring. The new PPI system significantly enhances photoinitiation efficiency and reduces migration, benefiting applications like food packaging.

Keywords:
fluorinated moleculesmigrationoxygen inhibitionphotocuringphotoinitiator

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Area of Science:

  • Polymer Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Oxygen inhibition and micromolecule migration from photoinitiators (PIs) are critical challenges in radical photocuring.
  • Traditional small-molecule PIs often suffer from migration, impacting material safety and performance.

Purpose of the Study:

  • To develop a one-component macromolecular photoinitiator (PPI) that addresses oxygen inhibition and micromolecule migration.
  • To enhance photoinitiation efficiency and reduce migration in radical photocuring systems.

Main Methods:

  • A one-step ternary copolymerization strategy using polymerizable thioxanthone (TX), amine (N), and fluorinated alkane (F) monomers.
  • Investigating the effects of monomer ratios on photoinitiation efficiency and photopolymerization kinetics.
  • Conducting migration experiments to quantify the reduction in molecule movement.

Main Results:

  • The synthesized PPI exhibits broad absorption (250-430 nm) and a higher molar extinction coefficient compared to micromolecule TX.
  • Increased content of the fluorinated alkane (F) unit effectively eliminates oxygen inhibition.
  • The PPI system demonstrates superior photoinitiation efficiency and a 60% reduction in migration rate compared to traditional TX/N systems.

Conclusions:

  • The developed PPI effectively mitigates oxygen inhibition and micromolecule migration in radical photocuring.
  • This strategy offers a promising approach for safer and more efficient photocuring applications, particularly in food and pharmaceutical packaging.