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The propagation of ultrasonic waves in solutions form an important tool for the evaluation of various acoustical and thermodynamical parameters which gives an insight in to the nature of miscibility and molecular interaction in polymer solutions. Density(ρ), viscosity(η), ultrasonic velocity (u) and refractive index(n) have been experimentally measured for PVP+1-propanol and +1-butanol at varying concentrations ranging from ( 0.1% to 0.9%) and temperatures (283.15K to 303.15K). Thermo-acoustical parameters viz adiabatic compressibility (βα) and intermolecular free length (Lf) have been calculated from the experimental data. The nature of polymer solvent interaction and the effect of concentration on the molecular interaction are studied. The trends in the variation of the solution property parameters indicate the existence of molecular interaction between the polymer and the alcohols. FT-IR spectrum of PVP solutions at concentrations (0.7%, 0.8%, 0.9%) have been recorded in the wave numbers range (4000-500cm-1). Optical absorption spectra of PVP solutions at concentrations (0.7%, 0.8%, 0.9%) have been recorded in the wavelength range (200-300 nm) by UV-Vis spectrophotometer. Optical band gap has been calculated for PVP solutions. 1H NMR spectroscopic technique of PVP solutions have been used to observe the selective line broadening or chemical shift displacements of 1H NMR signals. Experimental FT-IR spectrum of PVP solutions were compared with the calculated spectral data obtained by DFT/ B3LYP method. UV-Vis spectrum of the PVP solutions was calculated by TD-DFT approach.
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