Abstract
Isopropylthioxanthone, a versatile photoinitiator (PI) for free radical photopolymerization (FRP), is combined with a triazine derivative (Tz) in a Type‐II photoinitiating system (PIS). Initiation ability of this system for acrylate photopolymerization is assessed using a diacrylate monomer. Involvement of a photoinduced electron transfer mechanism is demonstrated by time‐resolved spectroscopic measurements. Further insights in this mechanism are obtained through the use of a photopolymerization kinetic model taking into account the main reaction steps from the absorption of photons to the formation of the polymer. Prediction ability of the model is also tested with different initial concentrations of PI and co‐initiator, as well as a different Tz. This last experiment reveals the noticeable role of back electron transfer in the FRP mechanism of Type‐II PIS. image
Highlights
Use of light for the synthesis of materials is an old topic: Egyptians used photocured bitumen of Judea to protect their mummies during the Antiquity.[1]
We studied the ability of a Type-II photoinitiating system combining isopropylthioxanthone (ITX) as photoinitiator and 2,4,6-tris(chloromethyl)-1,3,5-triazine as electron-accepting co-initiator to initiate acrylate photopolymerization
Triazine derivatives have often been considered in the development of photoinitiating systems for free radical photopolymerization of acrylates in Type-II PIS.[12,13,19]
Summary
Use of light for the synthesis of materials is an old topic: Egyptians used photocured bitumen of Judea to protect their mummies during the Antiquity.[1]. In order to get more insights into the key-steps of the actual initiating mechanism with triazine derivatives, we adapted a FRP kinetic model in order to take into account specificities of such a Type-II PIS
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