Artículos de revistas
TEMPERATURE-DEPENDENCE OF THE PHOTOBLEACHING PROCESS OF FLUORESCEIN IN POLY(VINYL ALCOHOL)
Registro en:
Journal Of Photochemistry And Photobiology A-chemistry. Elsevier Science Sa Lausanne, v. 85, n. 3, n. 285, n. 289, 1995.
1010-6030
WOS:A1995QD22900014
10.1016/1010-6030(94)03915-H
Autor
DIBBERNBRUNELLI, D
DEOLIVEIRA, MG
ATVARS, TDZ
Institución
Resumen
The fluorescence spectrum of fluorescein dissolved in poly(vinyl alcohol) (PVA) was recorded at various temperatures. These fluorescence spectra indicate that there is an enhancement of the photobleaching process of the dye at T>350 K. This temperature corresponds to the glassy transition of PVA which involves rupture of hydrogen bonds. The rupture of these bonds has also been followed by near-IR spectroscopy. The coincidence between these temperatures suggests that the glass transition and the enhancement of the photobleaching process are correlated, and that the former is strongly dependent on the mobility of the polymer chains. The determination of this limit temperature is important for technological applications of the PVA-fluorescein system. 85 3 285 289