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KMID : 0372919990200010099
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Journal of Biomedical Engineering Research
1999 Volume.20 No. 1 p.99 ~ p.106
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Wear Resistance of Crosslinked Ultra-high Molecular Weight Polyethylene
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Im Chae-Ik
Choe Gwi-Won
Choe Jae-Bong
Lee Gwi-Jong
Jo Jae-Yeong
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Abstract
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Ultra-high molecular weight polyethylene (UHMWPE) was crosslinked in the melt state to enhance wear resistance, Dicumyl peroxide (DCP) and triallyl cyanurate (TAC) was used as a crosslinking agent and a promoter, respectively. With increasing amount of DCP and TAC used, gel content of crosslinked UHMWPE (XUMPE) increased, while the melting temperature, crystallizaiton temperature, crystallinity, and tensile properties decreased. The results of pin-on-disk wear test and ball-on-disk test with small applied load showed reduced wear volumes of XUMPE from that of the unmodified UHMWPE. As the wear mechanism effected in the experimental condition of this study was thought to be deformation rather than adhesion or fatigue, a new parameter, the ratio of maximum contact stress to yield stress, was proposed to correlate well with observed wear resistance. In ball-on-disk wear test with larger applied load, XUMPE showed higher wear volumes than that of the unmodified UHMWPE which were accompanied with increased friction coefficients and surface roughness of the wear tracks. When contact stress was well above yield stress, the failure of XUMPE, as well as deformation, was thought to be much accelerated.
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KEYWORD
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UHMWPE, artificial joint, crosslinking, wear, tensile properties
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