Dispersive parameters of oxidized PVA-PVP blend films

Authors : Goputta VEENA, Blaise LOBO
Pages : 337-354
View : 16 | Download : 7
Publication Date : 0000-00-00
Article Type : Research Paper
Abstract :Oxidized insert ignore into journalissuearticles values(ox); polyvinyl alcohol insert ignore into journalissuearticles values(PVA);-polyvinyl pyrrolidone insert ignore into journalissuearticles values(PVP); blend films were prepared by solution casting technique, with doping levels of the oxidizer, potassium permanganate insert ignore into journalissuearticles values(KMnO4); , varying from 0.01 up to 4.70 weight percent insert ignore into journalissuearticles values(wt.%);. Optical insert ignore into journalissuearticles values(UV-Vis); spectral measurements in the wavelength range varying from 190 nm to 1000 nm were used to extract the band gap information and to calculate various optical parameters of the ox-PVA-PVP blend films. The electronic transitions on absorption of photons of suitable energy are of indirect allowed type. The corresponding optical band gap insert ignore into journalissuearticles values(Eg); has been determined. Optical dispersion parameters for ox-PVA-PVP films were determined using the Wemple and Didomenico method. Complex dielectric constants, relaxation time insert ignore into journalissuearticles values(τ); , dissipation factor insert ignore into journalissuearticles values(tan δ); , ratio of charge carrier concentration to effective mass insert ignore into journalissuearticles values(N/m*);, plasma frequency insert ignore into journalissuearticles values(ωp); , average oscillator wavelength insert ignore into journalissuearticles values(λo); , oscillator strength insert ignore into journalissuearticles values(So); , optical conductivity insert ignore into journalissuearticles values(σ); , and optical momenta of spectra insert ignore into journalissuearticles values(M-1 and M-3); were determined.
Keywords : Oxidized polymer, PVA PVP blend, optical analysis, potassium permanganate, UV Vis spectra

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