Optimization of a photopolymerizable material based on a photocyclic initiating system using holographic recording.
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.
Laboratory of Macromolecular Photochemistry and Engineering, University of Haute Alsace, ENSCMu, 3 rue Alfred Werner, 68093 Mulhouse, France.
A
A
Ibrahim
C
C
Ley
X
X
Allonas
O I
OI
Tarzi
A Chan
AC
Yong
C
C
Carré
R
R
Chevallier