1962 Volume 35 Issue 7 Pages 1078-1086
The photobleaching of acridine yellow has been studied in various vinyl monomers, such as acrylonitrile, vinyl acetate, styrene, α-methylstyrene and methyl methacrylate.
It has been found that (a) the photobleaching is apparently different in featue depending on the type of monomer; (b) the absorption maximum of the dye in the reaction systems shifted rapidly to a shorter wavelength in the cases of both styrene and α-methylstyrene by the irradiation of light, while it did not in the cases of acrylonitrile, vinyl acetate and methyl methacrylate; (c) a new absorption maximum at a shorter wavelength may result from the production of a relatively stable intermediate from the dye and styrene.
Considering also the effects of such quenchers as potassium iodide and hydroqinone on the photobleaching and the polymerization, it has been concluded that the interaction of the triplet state of the dye molecule with the monomers is responsible for both the bleaching and the polymerization.
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