Journal of Photoscience

Korean Society of Photoscience (한국광과학회)
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Anthracene-Sensitized Photolysis of Onium Tetrakis(Pentafluorophenyl) Borate Cationic Photoinitiators

  • Yasumasa Toba (Graduate School of Science and Engineering, Ibaraki University) ;
  • Midori Saito (Graduate School of Science and Engineering, Ibaraki University)
  • Published : 1998.10.01
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Abstract

Sensitized photolysis of two onium borates (diphenyliodoium and dimethylphenacylsulfonium tetrakis(pentafluorophenyl)borate, 1a and 2a , respectively) and cationic photopolymerization of an epoxy monomer by the photolysis were investigate. The onium borates were sensitized by the excited singlet of the athracenes(non-substituted, 9-methyl-and 9, 10-dimethylanthracene) and generated acid by decomposing teemselves. The quantum yields of photobleaching of the anthracenes($\Phi$-AH) and acid generatiion (øacid) by the onium borates were the same order as those of the corresponding onium salts in aerated solutions (methanol and acetoitrile) and in argon(Ar) saturated acetonitrile. However, in the photolysis of the iodonium borates 1a in Ar saturated MeOH , øacid was much higher than the corresponding ø-AH. The acid generated by the photolysis of the onium borates initiated cationic polymerization of an epoxy monomer. The values of both rate of polymerization (Rp) and degree of conversion on the photopolymerization for the iodonium borated 1a were higher than those of the sulfoium borate 2a. In the photopolymerization for the iodonium borate 1a, both the Rp value and the degree of conversinio increased upon the addition of glycerol as a hydrogen donor. It is suggested that the increase of both values may be caused with the increase of øacid by addition of glycerol.

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