The development of photoinitiating systems (PIS) is still a lively topic that finds attractive applications in many fields. However, most of the PIS exhibit absorption spectra in the UV-blue region. Therefore, there is a need to design new PIS that can be irradiated in the green to red region. In this paper, two different approaches were investigated to increase the efficiency of PIS for free radical photopolymerization.The efficiency of photocyclic photoinitiating systems PCIS based on dye (PI) was discussed. It was shown that the photopolymerization efficiency of the PCIS containing an amine (Co) and a triazine derivative (A) together with the dye is higher than that of the corresponding 2K system  . 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.Secondly, new dyads, based on squarylium dye and substituted-triazine, were synthesized that exhibit an intramolecular photodissociative electron-transfer. The photochemical activity of the dyad was compared to the corresponding unlinked systems (S+T). The efficiency of the dyad was demonstrated by measuring the maximum rate of free radical polymerization of acrylates in film. An excellent relationship between the rate of electron transfer and the rate of polymerization was found, evidencing the interest of this new approach to efficiently produce radicals under red light.

High-performance photoinitiating systems for free radical photopolymerization: Applications to holography recording

248th National Meeting (2014)

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