Transparent and thermally stable improved poly (vinyl alcohol)/Cloisite Na ~+/ZnO hybrid nanocomposite films: Fabrication, morphology and surface properties

摘要

A series of poly(vinyl alcohol)/Cloisite Na ~+-Tyrosine/Zinc oxide (PVA/Cloisite Na ~+-Tyr/ZnO) bionanocomposites were prepared by dispersing ZnO nanoparticles in solution containing mixture of the PVA and modified Cloisite Na ~+. Structure of nanocomposite coatings was investigated by X-ray diffraction and Fourier-transform infrared spectroscopy. The thermal stability and optical properties of bionanocomposite were characterized by thermogravimetric analysis and UV-vis spectroscopy, respectively. The introduction of ZnO nanoparticles into PVA/Cloisite Na ~+-Tyr mixed solutions significantly increased the thermal stability of the obtained films. The results revealed that the high UV-shielding efficiency of the composites: for a film containing 6.0 wt% of ZnO nanocrystals, over 92% of UV light at wavelengths of 368 nm was absorbed while the optical transparency in the visible region was slightly below that of a PVA/Cloisite Na ~+-Tyr film.