UV ABSORPTION, MECHANICAL AND OPTICAL BEHAVIOR OF ZINC OXIDE CONTAINING POLY (VINYL ALCOHOL - G – ACRYLONITRILE) NANOCOMPOSITES FILMS
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Abstract
UV absorption, mechanical and optical properties of PVA-g-PAN/ZnO nanocomposite films prepared by free radical graft copolymerization of acrylonitrile on to PVA and subsequent in situ precipitation of ZnO nanoparticles into the polymer matrix are reported in this abstract. The nanocomposites were characterized by various analytical methods such as FTIR, Raman spectroscopy, DSC, SEM and AFM etc. The size of the crystallites and extent of crystallinity were ascertained by XRD analysis. The SEM with EDX showed that the ZnO nanoparticles were uniformly dispersed within the host co-polymer matrix. TEM results clearly indicated that the size of zinc oxide nanoparticles varied in the range 10–30 nm. The UV-absorption properties of so prepared films were also studied using UV-visible absorption spectroscopy. UV absorption, transmittance and reflection spectra of nanocomposites suggest that small amounts of ZnO in the composite films are get high UV shielding above 95% UV absorption, 4% reflection and only 1% transmittance. The results reveal an excellent UV absorption at around 380 nm by nanocomposite films. These results supported to prepared nanocomposite film may be useful for UV protecting devices for defense, high altitude places, UV protecting crème for skin and other possible applications also. PL measurements reveal the existence of defects in the synthesized nanocomposites films.
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