Abstract
This study aims to benefit from the confinement of salicylic acid in the nanoscale to convert poly vinyl alcohol to be UV absorber. Therefore, Zn-Al LDH was prepared and used as a host. It intercalated with salicylic acid which used as a guest to form nanohybrid material. This nanohybrid material was inserted inside poly vinyl alcohol to build nanocomposite material. X-ray diffraction results and electron microscopy images showed that the interlayer spacing of Zn-Al LDH increased from 0.77 to 1.55 nm after intercalation reaction with salicylic acid. The thermal analyses revealed the presence of a complex system of supra-molecular host-guest interaction. The optical properties of Zn-Al-salicylate nanohybrid material showed new absorption bands in the UV region comparing with the absorption bands of salicylic acid sodium salt. Nanocomposite based on both Zn-Al-salicylate nanohybrid and PVA were characterized by X-ray diffraction, Scanning electron microscopy, UV-Visible absorption spectra, and thermal analyses. The experimental results suggested that the nanocomposite was formed via exfoliated structure and the nanohybrid layers were completely and uniformly dispersed in a continuous polymer matrix. By comparing with the thermal and optical properties of the original PVA, the PVA nanocomposite became more stable and UV absorber.