Abstract
The S 1 and T 1 excited states of several aromatic ketones (benzophenone, xanthone, fluorenone, thioxanthone, acridone, N-methylacridone) are quenched by methyl methacrylate (MMA). The rate constants of T 1 quenching ( k 3 q) measured by means of flash experiments show a linear log k 3 q vs. E T relationship. Results of kinetic treatment agree with the formation of 1,4-diradicals which decompose mainly into the starting materials, whilst some initiate the polymerization of MMA. Data of the kinetic experiments of polymer formation (monomer exponents, light intensity exponents) accord with such a mechanism. The polymers obtained contain the corresponding ketone moiety, identified by absorption and fluorescence measurements.
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