cerium oxide (ceria) nano particle, as photodegradation prevention agent was studied in water-based polyurethane clear coat  systems. polyurethane coatings show superior weathering resistance compared with acrylic melamine systems. however, any chemical change has detrimental effects on the property profile of pu coatings. coatings containing various amounts of cerium oxide nanoparticles were p...

this research was conducted to investigate the effect of acetylation on weathering resistance of solid wood and particleboard produced from acetylated particles of fagus orientalis. after 12 hours soaking in acetic unhydride, in order to achieve three levels of weight gain, 5, 9 and 16%, acetylated particles of bech wood were heated in oven at 120oc for 30, 90 and 240 minutes, respectively. als...

This study relates to the input and fate of fossil organic matter (FOM) in the modern environment, and focuses on two experimental watersheds overlying Jurassic marls: Le Laval and Le Brusquet (1 km 2 in area), located near Digne, Alpes-de-Haute-Provence, France. Considering that FOM delivery is mainly a result of different processes affecting sedimentary rocks [(bio)chemical and mechanical wea...

HDPE monofilaments were photostabilized with hindered amine l ight s tabi l izers (HALS) and UV absorbers at varying stabilizer concentrations. The filaments were assessed for UV resistance by exposure to simulated outdoor weathering conditions in artificial weathering apparatus and testing the exposed samples at regular intervals for retained tensile properties. Films of HDPE of varying thickn...

This work focuses on the study of the ‘‘calcare a lumachella’’ stone (Mt. Carrubba Fm.), a carbonate rock widely used as building and decorative material in the Baroque architecture of the Val di Noto (southeastern Sicily). Among all types of limestone outcropping in the area, this lithotype shows higher resistance to weathering. In such a context, the main goal of this study is to correlate th...

In this study, a green composite was produced from Oil Palm Trunk Lumber (OPTL) by impregnating oil palm shell (OPS) nanoparticles with formaldehyde resin. The changes of physical, mechanical and morphological properties of the OPS nanoparticles impregnated OPTL as a result of natural weathering was investigated. The OPS fibres were ground with a ball-mill for producing nanoparticles before bei...

This paper utilized 12 coating systems, based on an acrylate and a hydrophobic polymer, with the addition of light pigments, nano-sized polyvalent metal (AsS-chelate complex) for ultraviolet protection, and iodopropynyl butylcarbamate fungicide. This study deals with the impact of the number of coats on the color stability and the surface defects of painted black locust (Robinia pseudoacacia L....