Efeito da adição de SnO2 e NiO na matriz polimérica de Poli(Fluoreto de Vinilideno)

Abstract

Smart materials stand out as one of the research areas that fastest growing in recent years, the search for high technology combined with low costs are the premises of technological innovation and scientific development. This work studies the influence of tin and nickel metal ions in the form of oxides, such as tin oxide (SnO 2 ), nickel oxide (NiO) and tin oxide modified with 2 mol% of nickel (Sn 0,98 Ni0,02O2 ) inserted in the polymer matrix of poly(vinylidene fluoride) (PVDF). The oxides, obtained by co-precipitation method, stand out with their semiconductor, optical and electrical characteristics, that confer applicability in catalysis, sensors, solar cells, smart windows and transducers. From these materials, the polymeric matrix is modified in different concentration (mol/mol) in order to improve their piezoelectric, electric, magnetic and fluorescent properties. The films obtained by the chemical method, a previous study of the drying time of different modifiers was performed. In the characterization of powders, analysis by infrared spectroscopy (FTIR) denotes the formation of oxides during the stages of synthesis and analysis by X-ray informs obtaining their crystal structures and nano-sized crystallites. In the characterization of composite films, analysis by FTIR, aided by mathematical treatment of their bands, resulted in the characteristics of amorphous films hello indicating changes in crystallinity by the addition of modifiers. Was alson corroborated by this, the content of β phase, and The PVDF/Sn0,98 Ni0,02O2 composite was the best presented proportional increase in his phase the fraction of mofification. Analysis by optical absorption spectroscopy (UV-Vis) and fluorescence characterized the visible absorption and as well as red shift of the samples of PVDF/NiO, demonstrated the prominent capacity to apply as an optical material. The ionic conductivity of composite films was evaluated in junction with mathematical treatments indicated that the percolation threshold, and the two-dimensional and three-dimensional mechanisms for PVDF/SnO2 and PVDF/NiO composite, respectively, as well as a higher conductivity factor for the latter.