Wear performance of ultrahigh molecular weight polyethylene/quartz composites

Huazhong University of Science and Technology, Wu-han-shih, Hubei, China
Biomaterials (Impact Factor: 8.56). 06/2003; 24(11):1889-96. DOI: 10.1016/S0142-9612(02)00610-5
Source: PubMed


Ultrahigh molecular weight polyethylene (UHMWPE)/quartz composites were compression molded in the presence of organosiloxane, and then hydrolyzed. The used organosiloxane is vinyl tri-ethyloxyl silane. The gelation, the melting behavior, the crystallinity, the mechanical properties and the wear resistance of UHMWPE/quartz composites were investigated. The results showed that organosiloxane can act as a cross-linking agent for UHMWPE matrix and serve as a coupling agent for improving the bonding between the quartz particles and the UHMWPE matrix. The correlation between the various properties and the morphology of the composites has been discussed. At about 0.5phr organsiloxane while the degree of crystallinity of the composite is at the peak value of 57%, the mechanical properties and the wear resistance of UHMWPE/quartz composites reaches their maximum.

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    • "Chang et al. (2000) reported that the wear resistance of UHMWPE-fabric/resin-(GUR 4150HP) homocomposites were similar or worse than the control sample because of poor fiber–matrix adhesion. Xie et al. (2003) demonstrated that the wear resistance of UHMWPE filled with micron-sized quartz particles was improved using an organosiloxane coupling agent which increased the adhesion between the particles and the matrix. Poor adhesion of fiber-UHMWPE was also cited as a primary problem source which in turn caused inadequate consolidation and short term clinical failures in carbon fiber reinforced UHMWPE composites. "
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    ABSTRACT: A new patent pending technique is proposed in this study to improve the mechanical and biological performance of ultra high molecular weight polyethylene (UHMWPE), i.e., to uniformly coat nylon onto the UHMWPE fiber (Firouzi et al., 2012). Mechanical tests were performed on neat and new nylon coated UHMWPE fibers to examine the tensile strength and creep resistance of the samples at different temperatures. Cytotoxicity and osteolysis induced by wear debris of the materials were investigated using (MTT) assay, and RT-PCR for tumor necrosis factor alpha (TNFα) and interleukin 6 (IL-6) osteolysis markers. Mechanical test results showed substantial improvement in maximum creep time, maximum breaking force, and toughness values of Nylon 6,6 and Nylon 6,12 coated UHMWPE fibers between average 15% to 60% at 25, 50, and 70 °C. Furthermore, cytotoxicity studies have demonstrated significant improvement in cell viability using the nylon coated UHMWPE over the neat one (72.4% vs 54.8%) for 48 hours and (80.7 vs 5%) for 72 hours (P<0.01). Osteolysis test results have shown that the expression levels of TNFα and IL-6 markers induced by the neat UHMWPE fiber were significantly higher than those induced by the Nylon 6,6 coated UHMWPE (2.5 fold increase for TNFα at 48 hours, and three fold increase for IL-6 at 72 hours (P<0.01)). This study suggests that UHMWPE coated with nylon could be used as a novel material in clinical applications with lower cytotoxicity, less wear debris-induced osteolysis, and superior mechanical properties compared to neat UHMWPE.
    Full-text · Article · Apr 2014 · Journal of the Mechanical Behavior of Biomedical Materials
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    • "The percentage crystallinity was calculated by normalizing the heat of fusion to that of 100% crystalline PE (290 J/g). [18] [19] [20]. The rheological and viscoelastic properties of the nano-composites were characterized using a Dynamic Mechanical Analysis, DMA, instrument model AR-G2 from TA, USA. "
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    ABSTRACT: In the present study, different series of High Density Polyethylene (HDPE)/carbon nano-composites were prepared using melt blending in a co-rotating intermeshing twin screw extruder. The morphological, thermal, rheological, viscoelastic, mechanical, and fracture toughness properties of the nano-composites were analyzed. The microscopic examination of the cryogenically fractured surface found a good distribution of carbon nano-particles in the HDPE matrix. The melting temperature was not significantly affected by the addition of nano-carbon. Whereas, the crystallization percentage was slightly affected by adding carbon nano-particles into the matrix. The complex viscosity increased as the percentage of carbon increased. The Dynamic Mechanical Analysis (DMA) showed that the storage modulus increased with increasing the carbon nano-particles ratio and with increasing the testing frequency. The tensile test results showed that with increasing the carbon nano-particles contents, the Young’s modulus, yield strength of HDPE nano-composite increased while the strain at fracture decreased. Similarly, the fracture toughness and the strain energy release rate decreased proportional to the carbon content.
    Full-text · Article · Apr 2011 · Materials and Design
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    • "Particles were commonly added in polymers to increase wear resistance, some of which have been reported in the literatures for UHMWPE. Xie et al. [8] studied the wear performance of UHMWPE filled with organosiloxane coated quartz particles. "
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    ABSTRACT: Ultra-high molecular weight polyethylene (UHMWPE) is a kind of biomaterial applied as the acetabular cup in artificial hip joints. However, wear debris generation of UHMWPE materials after their replacements in human body has been proved to induce aseptic loosening and osteolysis, which is the main cause of long-term failure of total hip joints composed of UHMWPE and hard femoral balls. In this paper, natural coral (NC) particles in the size within 50 μm were applied as reinforcement fillers into UHMWPE to increase the wear resistance of UHMWPE composites as artificial acetabular cups. The micro-hardness and scratch resistance of UHMWPE/NC composites were studied. A hip joint wear simulator was operated to investigate the wear behavior of UHMWPE/NC composites against CoCrMo balls, the wear tests were lubricated by 25% bovine serum solutions. The wear mass loss and wear debris distribution through one million test cycles were examined in the paper. It is shown that the adding of NC particles in UHMWPE resulted in the enhancement of micro-hardness and scratching resistance of the UHMWPE/NC composites. The micro-hardness of UHMWPE/NC composites increased with natural coral contents in the linear relationship. The scratch coefficients of UHMWPE/NC composites increased in contents range of 10 wt% NC particles, the scratch depth decreased with the increasing NC contents. The wear resistance of UHMWPE/NC composites increased with the increasing contents of natural coral particles. It was found that the relation of wear mass loss of UHMWPE acetabular cup to the micro-hardness followed a negative power law. The wear mechanism of UHMWPE/NC composites was mainly controlled by adhesive wear. The NC contents in UHMWPE changed the severity of adhesive wear. The investigation of UHMWPE wear debris revealed that adding of NC particles in UHMWPE resulted in variations of size distribution of UHMWPE wear debris. Because micro-hardness of natural coral materials was much lower compared to CoCrMo alloy, few metal debris from CoCrMo ball were captured in the filter paper.
    Full-text · Article · Jun 2009 · Wear
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