2017-11-212017-11-212016https://repository.sebhau.edu.ly/handle/1/90Polymer nanocomposites are broadly studied throughout the world till now. Polymer nanocomposites show unique properties combining the advantages of the inorganic nanofillers and the organic polymers. Nanocomposites are composites in which at least one of the phases shows dimensions in the nanometer range. These are high performance materials that exhibit unusual property combinations and unique design possibilities and are thought of as the materials of the 21st century. Many methods has been used to synthesis of polymer nanocomposites. Therefore, this review article will make an overview about prepare polymer-based nanocomposites and investigate the effects of addition of inert fillers (Titanium dioxide) on polymer crystallization (Polyethylene oxide). Differential scanning calorimetry (DSC) provides a rapid method for determining polymer crystallinity based on the heat required to melt the polymer. It was observed that the melting temperature of PEO in PEO/TiO2 (VI) anatse lower than that of PEO pure, but when addition TiO2 P25 the melting temperature of PEO in PEO/TiO2 P25 is higher than that of PEO pure due to the spherulites are known to have lamella structure for all polymers and the increase of lamella thickness when added TiO2 cause an increase in Tm.encomposites, polymers, ceramics, polymer-nanoparticle, differential scanning calorimetry. 1. INTRODUCTION Polymer nanofillers (nanocomposites) are a class of hybrid materials composed of an organic polymer matrix with dispersed inorganic compounds. Polymer nanocomposite shows unique properties, combining the advantages of the inorganic nanofillers (e.g., rigidity, thermal stability) and the organic polymers (e.g., flexibility, dielectric, ductility, and processability). The inorganic nanofillers have large surface area, leading to a dramatic increase in interfacial area.1 Polymer nanocomposites are materials in which nanofillers inorganic particles usually 10-100 Angstrom (Aͦ) in at leastArticle