Abstract
AbstractThe photopolymerization of acrylamide in aqueous solution can be sensitized by various dye–reducing agent systems. The reaction is initiated by free radicals produced during the decomposition, in the presence of reducing agents, of hydrogen peroxide. This substance is formed during the reoxidation reaction by the oxygen present in the solution of the leuco derivative or the semiquinone which are produced in the photoreduction of the dyes. The formation of hydrogen peroxide during the photoreduction of dyes in the presence of oxygen has been demonstrated polarographically for the following systems: tetrabromofluorescein (eosin), 3,6‐diaminoacridine (acriflavin), 3,6‐bis(dimethylamino)acridine (acridine orange) as dyes and l(+)‐ascorbic acid or thiourea as reducing agents.
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