A coleção é composta pelo processo de vida funcional onde podem ser observados os relatórios de atividades, o projeto: "Fotofísica e Fotoquímica em Sistemas Poliméricos" , além dos anexos denominados comprovantes curriculares, destacando-se: o Memorial e o Curriculum Vitae com a indicação de sua produção científica.

A série é composta por um Memorial, onde constam cópias de artigos publicados em congressos, resumos, etc.

Secondary [beta] relaxation of polythylene blends (50/50 HDPE/LDPE) were studied by photoluminescence of anthracene moleculares dissolved in the polymer bulk. The temperature of the [beta] relaxation has beeen fluorescence band on the temperature . The molecular mechanism of this relaxation has been discussed considering the possibility of the energy migration involving anthracene molecules in the singlet electronic excited and ground states."

"The determination of the water content in organic solvents (acetone, dioxane, ethanol and polyethylene glycol 200) has been made using a spectrophotometric method based on the acid-base equilibrium of acridine orange dye (AO). It has been demontrated that this equilibrium may be displaced by the water content in these solvents and may be followed by the concentration of the monoprotonated form of the dye (AOH*). The intensity of the visible absorption band of this form is quantitatively related to the water content."

"In this work we present a review of the applications of luminescent probes to follow relaxation processes in polymers. We describe some results using different types of luminescent molecules, such as: benzophenone (phosphorescent molecule), which may be useful to determine motions of smail segments of the macromolecules; fluorescein (fluorescent molecule), used to determine the glass transition temperature in polyethlene glycol 600; and anthracene (fluorescent molecule), which was convenient for studing relaxation process involving macromolecular segments with the same dimension as its longest axis . We also discuss the most important photophysical process. Finally, we report results with poly (vinyl chioride) and some of its homopolymer blends, using anthracene as a fluorescent probe."

"Secondary relaxations of low density polyethylene-poly(vinyl chloride) blends with various proportions of components (1:9, 1:1 and 9:1 w/w) were studied by photoluminescence of anthracene molecules dissolved in the bulk polymer. The temperatures of the relaxation involvents motions of short segments of the polymer chains. These blends show phase separation in the solid state which is observed by fluorescence optical microscopy. It is also noted that the distribution of anthracene molecules in the blends is not homogeneous and it is mostly concentrated in the polyethylene domains."

"Phosphorescence lifetime in polymer relaxation studies: Phase resolutions method. We describe in this work a simple experimental set up perform time dependent luminescence experiments in time scales from mili-seconds to seconds, based on the phase resolutions of the emission signal. This system is composed by modulation of a continuous light source with an external chopper controlled by a lock-in amplifier. We exemplified the utility of the system in studies of phosphorecence emission using benzophenone dissolved in polystryrene and since the phosphorescence intensity and lifetime are temperature-dependent processes, we also studied polymer relaxation processes, in the temperature range from 20 to 400k. A software that drives the spectrofluorimeter and controls both the cryosytem and the lock-in amplifier was developed.

"The fluorescence spectrum of flourescein 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>350K. This temperature corresponds to the glassy transition of PVA wich involves rupture of hydrogen bonds. The rupture of these bonds has also been followed by near-IR spectroscopy. The coincidience between these temperatures suggests that the glass transition and the enhancement of the photobleaching process are correlated, and that the former is strongl dependent on the mobility of the polymer chains. The determination of this limit temperature is important for technological applications of the PVA-fluorescein system."

"Secondary relaxations of (vinil alcohol) ( PVA) poly (vinyl acetate) (PVAc) and their blends in different proportions (9:1,1:1, and1:9) were studied by photoluminescence of anthracene fluorescein, and both probes dissolved in the polymer blends. The temperature of the glass transition in the homopolymers was determined by the radiationless deactivation of anthracene as [Tg(PVAc)=304K) and the photobleaching of fluorescein as [Tg (PVA)=350K. The relaxation processes of the different phases of the polymer blends occur at temperatures close to the homopolymers, which may be explained by the localization of to those of the individual homopolymers, suggesting a partial miscibility between these polymers."

"The instalation of lock-in amplifier in the detector system of a spectrofluorimeter and the substitution the analogic motor driver of the monocromator gratings by microcomputer controlled stepper-motors are described. A software that drives the stepper-motors and controls all the lock- in functions enables the spectrofluorimeter to work synchronized with a digitally controlled cryostat (10K-415K) and transform that in an instrument specialized in the study of temperature dependence of luminescent properties."