CIHIDECAR   12529
CENTRO DE INVESTIGACIONES EN HIDRATOS DE CARBONO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Pyrromethene derivatives as photoinitiators in free radical photopolymerization
Autor/es:
OLGA I. TARZI, XAVIER ALLONAS, JEAN-PIERRE FOUASSIER
Lugar:
Santiago de Compostela, Espania
Reunión:
Congreso; 19th IUPAC Conference on Physical Organic Chemistry; 2008
Institución organizadora:
Universidad de Santiago de Compostela
Resumen:
Besides from
being well known solid-state laser dyes, pyrromethenes have shown very good
performance as sensitizing dyes in photopolymerization. In this study, 1,3,5,7,8-pentamethyl
pyrromethene BF2 complex (HMP, 1)
and 2,6-diethyl-8-phenyl-1,3,5,7-tetramethylpyrromethene
BF2 complex (EPP, 2) were used to polymerize a diacrylate in a two and a three component
system, together with an amine (3)
and a triazine (4). For both
pyrromethenes, the highest conversion was achieved with the three component
photoinitiating system. 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 triazine, as well as laser flash photolysis to
investigate the electron transfer process that occurs in these photoinitiating
systems.