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Abstract:

1,3,5,7,8-pentamethyl pyrromethene difluoroborate complex (HMP) and 2,6-diethyl-8-phenyl-1,3,5,7-tetramethylpyrromethene difluoroborate complex (EPP) were used to initiate the polymerization of a diacrylate in a two- and a three-component photoinitiating system (PIS), together with an amine (ethyl-4-dimethylaminobenzoate, EDB) and triazine A (2-(4methoxyphenyl)-4,6- bis(triehloromethyl)-1,3,5-triazine, TA) as coinitiators. For both pyrromethene dyes, the highest conversion was achieved with the three-component PIS. As these dyes have high-fluorescence quantum yields, steady state and time-resolved techniques were used to study the possible fluorescence quenching by the amine and the triazine, as well as laser flash photolysis to investigate the electron transfer process that occurs in these PIS from either the singlet or triplet excited states. The electron transfer reaction is evidenced by using time-resolved photoconductivity. Experiments show that the main interaction between the dye and both coinitiators is through its excited singlet state and the process is more efficient when TA is present. The beneficial effect noted when both coinitiators are used in a three-component system is ascribed to secondary reactions between the coinitiators and intermediates that lead to the generation of higher amount of initiating species and the recovery of the initial dye © 2010 Wiley Periodicals, Inc.

Registro:

Documento: Artículo
Título:Pyrromethene derivatives in three-component photoinitiating systems for free radical photopolymerization
Autor:Tarzi, O.I.; Allonas, X.; Ley, C.; Fouassier, J.-P.
Filiación:CIHIDECAR-CONICET, Department of Organic Chemistry, FCEyN-University of Buenos Aires, Pabellón 2, 1428Buenos Aires, Argentina
Department of Photochemistry, UMR 7525 CNRS, Université de Haute-Alsace, 3 rue Alfred Werner, 68093 Mulhouse, France
Palabras clave:Electron transfer; Kinetics; Photochemistry; Photopolymerization; Pyrromethene dye; Triazine; Beneficial effects; Co-initiators; Diacrylates; Dimethylaminobenzoate; Electron transfer; Electron transfer kinetics; Electron transfer process; Electron-transfer reactions; Excited singlet state; Fluorescence quantum yield; Fluorescence quenching; Free radical photopolymerization; Laser flash photolysis; Photochemistry; Photoinitiating systems; Pyrromethene; Secondary reactions; Steady state; Three-component; Three-component system; Time resolved technique; Time-resolved; Electron transitions; Fluorescence; Free radicals; Metal recovery; Organic compounds; Photolysis; Photopolymerization; Quantum theory; Reaction intermediates; Secondary recovery; Free radical reactions
Año:2010
Volumen:48
Número:12
Página de inicio:2594
Página de fin:2603
DOI: http://dx.doi.org/10.1002/pola.24039
Título revista:Journal of Polymer Science, Part A: Polymer Chemistry
Título revista abreviado:J Polym Sci Part A
ISSN:0887624X
CODEN:JPACE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0887624X_v48_n12_p2594_Tarzi

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Citas:

---------- APA ----------
Tarzi, O.I., Allonas, X., Ley, C. & Fouassier, J.-P. (2010) . Pyrromethene derivatives in three-component photoinitiating systems for free radical photopolymerization. Journal of Polymer Science, Part A: Polymer Chemistry, 48(12), 2594-2603.
http://dx.doi.org/10.1002/pola.24039
---------- CHICAGO ----------
Tarzi, O.I., Allonas, X., Ley, C., Fouassier, J.-P. "Pyrromethene derivatives in three-component photoinitiating systems for free radical photopolymerization" . Journal of Polymer Science, Part A: Polymer Chemistry 48, no. 12 (2010) : 2594-2603.
http://dx.doi.org/10.1002/pola.24039
---------- MLA ----------
Tarzi, O.I., Allonas, X., Ley, C., Fouassier, J.-P. "Pyrromethene derivatives in three-component photoinitiating systems for free radical photopolymerization" . Journal of Polymer Science, Part A: Polymer Chemistry, vol. 48, no. 12, 2010, pp. 2594-2603.
http://dx.doi.org/10.1002/pola.24039
---------- VANCOUVER ----------
Tarzi, O.I., Allonas, X., Ley, C., Fouassier, J.-P. Pyrromethene derivatives in three-component photoinitiating systems for free radical photopolymerization. J Polym Sci Part A. 2010;48(12):2594-2603.
http://dx.doi.org/10.1002/pola.24039