Ultraviolet radiation (UV) accelerated the degradation and cracking of polymers. Our work focused on delay the
degradation rate of unsaturated polyester outdoor by loading Carbon black (CB) and carbon nanoparticles (CNP). We
prepared composites and nanocomposites from modified unsaturated polyester (UPEG) as a matrix with different wt.%.
of Carbon black (5%, 10%, 20%, and 30%CB) and carbon nanoparticles (0.1%,0.2%,0.3%,0.4%, and 0.5%CNP). X-ray
diffraction and a High-resolution Transmission electron microscope investigated the morphology and surface of
nanohybrid materials, showed the significant homogeneity and good dispersion of CNP into the UPEG matrix. Fourier
transforms infrared detected the change of structure (UPEG) when compared with the neat resin. QUV accelerated
weathering tester investigated the effect of wt. percentage and types (micro or nano) of filler in the degradation process
of the modified unsaturated polyester resin. Mechanical properties (tensile strength and Hardness shore D) were done
before and after the exposure of the sample to UV degradation. Hardness was improved with CNP than CB filler even at
high content of 30% CB. The UPEG/CNP had high stability and their rate of degradation was more slowly than in net
resin, also when it comparison with UPEG/CB hybrids. The thermal stability of UPEG/ CNP was enhanced compared to
that of unfilled UPEG and determined by Thermal gravimetric analysis.