# Oxime Esters as Efficient Initiators in Photopolymerization Processes

## TL;DR

This paper introduces oxime esters as effective and versatile photoinitiators for light-based polymerization, offering potential for safer and more efficient materials.

## Contribution

The study presents five new oxime ester series with dual photoinitiator activity and high performance in polymerization.

## Key findings

- Oxime esters showed high monomer conversion degrees as both type I and type II photoinitiators.
- Structural variations based on different scaffolds enhanced their photoinitiating efficiency.
- The compounds offer a foundation for improving solubility and assessing toxicity.

## Abstract

The development of new photoinitiators for photocurable systems has gained increasing interest in response to regulatory and environmental requirements, including efficient absorption in the UV/Vis range and reduced toxicity. Among emerging light-sensitive compounds, oxime esters have attracted growing attention as efficient radical photoinitiators. In this paper, five series of oxime esters based on carbazole, coumarin, carbazole–coumarin, phenothiazine, and triphenylamine scaffolds were described. Their high performance in photopolymerization processes was presented, demonstrating their ability to act as both type I and type II photoinitiators, as confirmed by high monomer conversion degrees. These data highlight oxime esters as versatile photoinitiating systems and provide a basis for further structural optimization aimed at improving water solubility and enabling comprehensive cytotoxicity assessment.