Optimization of a photopolymerizable material based on a photocyclic initiating system using holographic recording

Ahmad Ibrahim (1) , Christian Ley (1) , Xavier Allonas (1) , Olga Tarzi (1) , Aurélie Chan Yong (2) , Christiane Carré (2) , Raymond Chevallier (3)

1 LPIM - Laboratoire de Photochimie et d'Ingénierie Macromoléculaires
2 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
3 Mines Douai EMD - École des Mines de Douai

A set of photoinitiating systems (PIS) for free radical photopolymerization was studied using time-resolved spectroscopic experiments, real-time FTIR and holographic recording. It is shown that the efficiency of the photoinitiating system can be drastically increased when a redox additive is added to the conventional dye/coinitiator system by virtue of photocyclic behaviour. The homogeneous photopolymerization process was found to reach a fast vitrification, limiting the conversion at about 55%. By contrast, holographic recording underlines the differences in photoinitiating system reactivity, allowing diffraction efficiencies close to unity for the most reactive PIS.

Mots clés: Photopolymerizable systems; photocyclic initiating system; holographic recording

Domaines: Matériaux; Optique [physics.optics]

Ahmad Ibrahim, Christian Ley, Xavier Allonas, Olga Tarzi, Aurélie Chan Yong, et al.. Optimization of a photopolymerizable material based on a photocyclic initiating system using holographic recording. Photochemical & Photobiological Sciences , 2012, 11, pp.1682-1690. ⟨10.1039/C2PP25099C⟩. ⟨hal-00920012⟩