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Long wavelength photosensitizers with benzotriazole and benzimidazole skeletons for cationic polymerization
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Date
2011
Author
Yılmaz, Seda
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Benzimidazole and benzotriazole derivatives, 4-(2,3-Dihydrothieno[3,4-b][1,4] dioxin-5-yl)-7-(2,3-dihydrothieno[3,4b][1,4]dioxin-7-yl)-2-benzyl-1H-benzo[d] imidazole (BIm-Ed), 2-benzyl-4,7-di(thiophen-2-yl)-2H-benzo[d] [1,2,3] triazole (BBTS), and 2-benzyl-4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2Hbenzo[ d] [1,2,3] triazole (BBTES) were employed as photosensitizers for diaryliodonium salt photoinitiators in cationic photopolymerization of various epoxide and vinyl ether monomers. Diphenyliodonium hexafluorophosphate (Ph2I+PF6̄) salt was used as the photoinitiator in this study. Extended conjugation and electron-rich moieties of the photosensitizers enabled the use of long wavelength UV and visible light emitting light sources in cationic photopolymerizations. Polymerizations were achieved at room temperature and monitored by optical pyrometry. Photopolymerization of a diepoxide monomer with ambient solar irradiation was examined.
Subject Keywords
Photochemistry.
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http://etd.lib.metu.edu.tr/upload/12613457/index.pdf
https://hdl.handle.net/11511/20710
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Graduate School of Natural and Applied Sciences, Thesis
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S. Yılmaz, “Long wavelength photosensitizers with benzotriazole and benzimidazole skeletons for cationic polymerization,” M.S. - Master of Science, Middle East Technical University, 2011.
