Degradation of poly(vinyl pyrrolidone) / polyaniline film in the presence of TIO2 in acidic and basic solutions
Abstract
Poly(vinyl pyrrolidone)/Polyaniline (PVP/PANI) was synthesized without and with TiO2 through the oxidative in situ polymerization method. Degradation, and stability of PVP/PANI and PVP/PANI/TiO2 films in gentile acid and base solutions (pH = 1-14) were studied. Degradation of films was studied using water uptake test, Fourier-transform infrared (FTIR) spectroscopy, Ultraviolet diffuse reflectance spectroscopy (UV-DRS), and scanning electron microscopy (SEM). SEM results for PVP/PANI films show that fractures and cavities in base solution film is more than those on acid solution film surface. It denotes that the PVP/PANI film degradation in the alkaline solution is more than the degradation of film in the acid solution. SEM micrographs show no significant changes on the surface morphology of PVP/PANI/TiO2 films, denoting stability of these films in acid and alkali environments. The results indicate that both PVP/PANI and PVP/PANI/TiO2 films show very weak degradation in an acid solution in comparison with a base environment. PVP/PANI films show some degradation in the base environment (specifically in pH = 11 and higher pH), which is primarily due to PVP degradation. Unlike the PVP/PANI, PVP/PANI/TiO2 films show a weak degradation in the alkaline solutions.
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