期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 170, 期 2, 页码 123-129出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2004.08.010
关键词
photopolymerization; cyanine dye; near IR; photoinduced electron transfer
The sensitizing abilities of near infrared (near IR)-absorbing ionic (D1) and non-ionic (D2 and D3) cyanine dyes in a photoinduced radical polymerization system were evaluated. The solubility in an organic solvent of non-ionic cyanine dyes is much higher than that of an ionic cyanine dye. The photoinduced radical polymerization system consists of a sensitizing dye (D1-D3), 2,4,6-tris(trichloromethyl)-s-triazine (TCT, as a radical genetrator), and a poly-functional acrylate monomer (DPHA) in the binder polymer. All dyes showed a sensitizing ability in the photoinduced radical polymerization systems by near IR light. Non-ionic cyanine dyes, D2 and D3, showed a higher sensitizing ability than D1. From the IR and UV-vis studies, it was revealed that the high sensitizing ability of D2 and D3 is a result of an interaction between the dye and TCT in the polymer matrices, promoting the electron-transfer from the dyes to the TCT. (C) 2004 Elsevier B.V. All rights reserved.
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