Analysis of Ultra-High Molecular Weight Polyethylene Reinforced with Zeolite Composite for Human Implant
Journal Title: REST Journal on Emerging trends in Modelling and Manufacturing - Year 2016, Vol 2, Issue 1
Abstract
Ultra-high molecular weight polyethylene reinforced with different loadings of zeolite particles were prepared using hot compression molding. The effects of zeolite particles on the mechanical and tribological properties of the ultra-high molecular weight polyethylene composites were studied. the tribological properties were investigated using a ducom tr-20 pin-on-disc tester under different sliding speeds of 0.209 m/s, 0.419 m/s and 0.838 m/s with various applied loads of 10, 20, and 30 n. the worn surfaces and transfer films of the zeolite ultra-high molecular weight polyethylene composites were observed under the scanning electron microscope. The results showed that the addition of zeolite into ultra-high molecular weight polyethylene matrix has reduced the tensile strength and elongation at break, but increased the modulus. The 10 wt. % zeolite ultra-high molecular weight polyethylene composites showed an increase of ~25% in impact strength as compared to pure ultra-high molecular weight polyethylene. The 20 wt. % zeolite ultra-high molecular weight polyethylene composite exhibited lowest wear volume loss as compared to 10 wt. % zeolite/ultra-high molecular weight polyethylene and pure ultra-high molecular weight polyethylene. In addition, the average coefficient of friction was also found to decrease with the addition of zeolite. The lowest average coefficient of friction was also obtained with the 20 wt. % zeolite/ultra-high molecular weight polyethylene composite. The wear volume loss was found to increase with increasing applied loads for all samples. Meanwhile, the average coefficient of friction values have decreased with increasing applied loads. Furthermore, shallower wear grooves and smoother worn surfaces were observed for zeolite/ultra-high molecular weight polyethylene composites as compared to pure ultra-high molecular weight polyethylene. In terms of the transfer film observation, the counter face of pure ultra-high molecular weight polyethylene was partially covered, rough, and discontinuous. On the other hand, counter faces of zeolite/ultra-high molecular weight polyethylene composites were fully covered, smooth, and continuous. Overall, the tribological properties showed significant improvement with the reinforcement of zeolite in ultra-high molecular weight polyethylene.
Authors and Affiliations
Salman Khatik
Keywords
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