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Alternative initiators for bimolecular photoinitiating systems

Authors

  • Claudia Dworak,

    Corresponding author
    1. Division of Macromolecular Chemistry, Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163/MC, 1060 Vienna, Austria
    • Division of Macromolecular Chemistry, Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163/MC, 1060 Vienna, Austria
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  • Robert Liska

    1. Division of Macromolecular Chemistry, Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163/MC, 1060 Vienna, Austria
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Abstract

Typical bimolecular photoinitiators (PIs) for radical polymerization of acrylates show only poor photoreactivity because of the unwanted effect of back electron transfer. Therefore, a PI system consisting of benzaldoxime esters and 4-methyl benzophenone was investigated by photo-differential scanning calorimetry experiments. Surprisingly, reactivities are comparable to that of classical monomolecular Type I PIs like Darocur 1173, probably because of an energy transfer from the triplet state of the benzophenone-based sensitizer to the oxime ester initiator. Furthermore, sufficient thermal stability was proven by TGA and storage stability experiments of a resin formulation under elevated temperature. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010

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