Abstract
The bis(acetylacetonato)platinum(II) is a common thermal catalyst for the hydrosilation reaction, and it is reported to serve also as a photoactivated catalyst for hydrosilation addition of silanes to alkenes and alkynes. In this paper, it is demonstrated that the UV-activation of hydrosilation reaction proceeds via a thermal-frontal mechanism. UV light activates the polymerization on the surface of the sample and, subsequently, the heat released by hydrosilation generates a thermal front, converting the UV-generated homogeneous catalyst to a Pt0 heterogeneous catalyst. The UV-induced frontal polymerization mechanism can exhaustively explain the dark-curing process observed in the UV-activated hydrosilation reaction.
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