Abstract
The anthraquinone (AQ)-sensitized photopolymerization of acrylate and methacrylate monomers is investigated at 30°C in isopropanol-cyclohexane solvent. The maximum value in conversion is observed at a certain concentration of isopropanol in cyclohexane and this is dependent on the kind of monomer used. Acrylic acid, methyl acrylate, methacrylic acid and methyl methacrylate are included in this type of monomer, whereas no maximum conversion is observed for ethyl acrylate, ethyl methacrylate and n-butyl methacrylate. By studying the absorption spectrum of the irradiated AQ in the presence of monomer, the latter monomers are concluded to have an ability to reduce AQ to yield anthrahydroquinone on irradiation. On the other hand, no anthrahydroquinone was formed by the former monomers. Considering the results of photopolymerization and absorption spectrum in terms of the hydrogen-donating character of the monomer, the mechanisms of AQ-sensitized photopolymerization are discussed.
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