The effect of Cerium Dioxide Nanoparticles on the Physical Properties of Polyurethane Clear Coating

In this study the effect of nanoparticles of Cerium dioxide (CeO2) and The combined effects bundled with nano-silica in Order to improve the physical properties of polyurethane clear coatings on Thermally modified wood of spruce (Picea abies) substrate were examined. For this purpose, different formulations of polyurethane coatings containing different amounts of the nanoparticles were applied on the heat treated wood surface after preparation. The presence of nanoparticles in polyurethane nanocomposite coating structure was confirmed by EDS analyses. To examine the effects of nanoparticles, adhesion, surface roughness and hardness of polyurethane coatings were assessed. The results showed that the use of cerium dioxide caused to improve the performance of polyurethane coatings on heat treated wood by reducing roughness and increasing adhesion strength of coating layer. In addition, the hardness of polyurethane coating layer enhanceded in the presence of cerium dioxide. Silica nanoparticle in the polymer matrix linked to cerium dioxide gave rise to enhance the adhesion strength and roughness of nanocomposite coatings.