Experimental Studies on the Tribology behavior of UHMWPE/zeolite Nanocomposite

In this research article, the effect of zeolite nanoparticles on the tribological properties of high molecular weight polyethylene, which are widely used in orthopedic implants, has been studied. Improving the tribological properties of this polymer is one of the medical industry challenges which has an important effect on the life-time of orthopedic implants. Nanocomposites based on ultra-high molecular weight polyethylene (UHMWPE) blend, containing 2 to 6 phr of nano-zeolite, were prepared via melt compounding followed by injection molding. The morphology was studied using scanning electron microscopy. The wear and temperature of specimens as well as friction coefficient were characterized by employing a pin on disk test under 50 N and sliding velocity of 0.5 m/s. The wear rates, temperature and friction coefficient of nanocomposite containing 4 phr of nano-zeolite, were 56, 32 and 26%, respectively, lower than those of neat UHMWPE. In contrast, the application of 6 phr of of nano-zeolite, led to agglomeration and increased wear, temperature and coefficient of friction compared to nanocomposite samples. In addition, the morphology of nanocomposite samples, after testing, revealed a smoother surface with the mild abrasion marks than that of of pure UHMWPE sample.