Síntese e caracterização de misturas poliméricas condutoras para aplicação em membranas biodegradáveis e dispositivos eletroluminescentes / Synthesis and characterization of conducting polymeric blends for use in biodegradable membranes and electroluminescent devices

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

02/08/2012

RESUMO

The electrical properties of some conducting polymers and their blends have contributed to the technological advancement in various areas such as medicine and microelectronics. Recently, photochemical synthesis and spinner techniques have been using to prepare polymeric blends with good conducting properties. In this study we report the preparation of conducting polymer blends composed of poly (3-thiophene methyl acetate)/Poly (butylene succinate) PT3MA/PBS and composites of poly (3-thiophene methyl acetate)/Poly (vinylidene fluoride)/manganese doped with zinc silicate "PT3MA/PVDF/Zn2SiO4:Mn" for obtaining, respectively, conducting biodegradable nanomembranes and films applicable to electroluminescent devices. A parallel study on the electrical properties of polymeric blends obtained by photochemical synthesis composes of polythiophene / poly (vinylidene fluoride) was conducted to evaluate the conductivity of the films. The new materials were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Raman Spectroscopy, Visible Ultraviolet, Nuclear Resonance Magnetic (1H NMR), Profilometry, Ellipsometry, Optical Microscopy, Scanning Electron Microscopy (MEE), Atomic Force Microscopy (AFM), X-Ray Diffraction, Differential Scanning Calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. The electrical conductivity measurements of the 80:20 PT3MA/PBS biodegradable nanomembranes show conductivity from 10-4 to 10-5 S/cm depending on the thickness, values within the range typical found for semiconducting polythiophenes. The conductivity values shown by the membranes composed of PT3AA-K/PVDF poly (thiophene acetic acid) polyanion/poly (vinylidene fluoride) blends obtained by photochemical synthesis, indicate an increase in conductivity of up to 10-4 at PVDF matrix. The optical electric behavior of the monolayer devices formed by PT3MA/PVDF/ZnSiO4:Mn composite films was monitored by absorption and emission measurements in UV-visible and by (I-V) Characteristic Curves. The luminous energy intensity measurements show the luminescence ability of the new material and its potential for use as active layer in electroluminescent optical devices.

ASSUNTO(S)

polímeros condutores fotoquímica - síntese polythiophenes polymeric compounds politiofenos compostos poliméricos conducting polymers photochemical synthesis

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