Estudo da influência da temperatura na preparação de amostras de poli (fluoreto de vinilideno) dopadas com érbio

Abstract

The present presents the study of the influence of temperature and concentration in three samples of poly (vinylidene fluoride) (PVDF) crystallized at 50, 90 and 120°C. By this way were prepared pure PVDF film and erbium oxide doped (Er2O3). In this sense, for Better understanding of the effects caused by the addition of doping on structural and optical properties of polymer matrix, PVDF films and their composites were prepared on the following concentrations 0.5; 1; 2; 5; 10 and 20% (m/m) and characterized by FT-IR. The FT-IR it was estimated the relative percentage of β phase and the incorporation of doping in polymer matrix. For characterization of optical properties were used the techniques of the UV-Vis molecular absorption, molecular optical spectroscopy drive of fluorescence (FL) and fluorescence experience as a temperature function. The absorption results for all temperatures of crystallization used have demonstrated changes in intensities of absorption bands which reflect in the band of energy, this energy variation indicates a possible level change on crystallinity within the polymer matrix. Fluorescence spectroscopy measures of it was observed that the addition of doping in different crystallization temperatures in composites, significant changes in the emission of PVDF. It also was observed a decrease in the intensity of the emission bands of the PVDF temperature, which is due to the material of ferroelectricity, where the temperature variation affectson it, decreasing their polarization consequently decreasing of the polymer fluorescence. This result is very important from the point of view of technology, as well as show the PVDF can be used as host matrix for rare earthelements, shows the existence of a direct relationship with fluorescence polymeriron-electricity.