Results 181 to 190 of about 8,135 (219)
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Oxidation of orthopaedic UHMWPE
Biomaterials, 2002Retrieved EtO sterilised acetabular cups usually show much less degradation than gamma-ray sterilised cups. Some of our retrieved EtO sterilised cups did, however, reveal unexpected bulk oxidation. It was observed that this oxidation was always accompanied by whitening of the material. This whitening was found to be due to a break-up of the compression
L, Costa +3 more
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Macromolecular Symposia, 2009
AbstractPolyolefin coordination catalysts useful for producing UHMWPE are surveyed, including classic Ziegler‐Natta (ZN), current commercial generation ZN, metallocene single site, and non‐metallocene. Catalysts were prepared and compared for productivity and selected polymer properties under a variety of conditions.
R.L. Jones, M. Armoush
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AbstractPolyolefin coordination catalysts useful for producing UHMWPE are surveyed, including classic Ziegler‐Natta (ZN), current commercial generation ZN, metallocene single site, and non‐metallocene. Catalysts were prepared and compared for productivity and selected polymer properties under a variety of conditions.
R.L. Jones, M. Armoush
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Melt miscibility of HDPE/UHMWPE, LDPE/UHMWPE, and LLDPE/UHMWPE blends detected by dynamic rheometer
Polymer Science Series A, 2014The dynamic rheological behavior of high density polyethylene (HDPE)/ultrahigh molecular weight polyethylene (UHMWPE) blends, low density polyethylene (LDPE)/UHMWPE blends and linear low density polyethylene (LLDPE)/ UHMWPE blends was measured in parallel plate rheometer at 200°C.
Yang Chen, Huawei Zou, Ya Cao, Mei Liang
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Accelerated aging studies of UHMWPE. II. Virgin UHMWPE is not immune to oxidative degradation
Journal of Biomedical Materials Research, 2002AbstractIn Part I of this series, we showed that aging at elevated oxygen pressure is more successful at increasing the depth to which degradation occurs although it, too, generally causes greater degradation at the surface than at the subsurface.
A A, Edidin +5 more
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Journal of Thermal Analysis, 1997
The thermal behaviour of ultra-high molecular weight polyethylene (UHMWPE) of different molecular weights was examined by thermal analysis methods. The melting temperatureTm and the heat of melting δH were measured by the DSC method. The thermooxidative degradation process was investigated by using a MOM Q-1500 D derivatograph at various heating rates ...
E. Rudnik, Z. Dobkowski
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The thermal behaviour of ultra-high molecular weight polyethylene (UHMWPE) of different molecular weights was examined by thermal analysis methods. The melting temperatureTm and the heat of melting δH were measured by the DSC method. The thermooxidative degradation process was investigated by using a MOM Q-1500 D derivatograph at various heating rates ...
E. Rudnik, Z. Dobkowski
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2016
Removal or transfer of material from contacting surfaces due to their relative movement under load. Wear can be measured by mass change, volume measurement or by the depth of the wear tracks. The two inevitable consequences are shedding of wear products and change of the geometry of the articulation.
B. M. Wroblewski +2 more
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Removal or transfer of material from contacting surfaces due to their relative movement under load. Wear can be measured by mass change, volume measurement or by the depth of the wear tracks. The two inevitable consequences are shedding of wear products and change of the geometry of the articulation.
B. M. Wroblewski +2 more
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Processing of UHMWPE and HA/UHMWPE nanocomposite for biomedical applications
2014Ultrahigh molecular weight polyethylene (UHMWPE) is an implant material for orthopedic implants because of its excellent mechanical properties. However, its applications were limited by the poor processability, particularly its use as matrix materials for bone-analogue.
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Dispersion of Pristine Cnt in Uhmwpe Solution to Prepare Cnt/Uhmwpe Composite Fiber
Polymers and Polymer Composites, 2014CNT dispersion in polymer matrices uniformly remains a challenge. Uniform dispersion of carbon nanotube (CNT) within ultra-high molecular polyethylene (UHMWPE) solution is the first step to achieve CNT/UHMWPE fibers with excellent properties. Several approaches have been tried.
Xiangyang Hao +4 more
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Nanotribological Properties of UHMWPE/Quartz Composites
Materials Science Forum, 2005Wear of ultra-high molecular weight polyethylene (UHMWPE) and its composites is one of the main obstacles that limit the longevity of total joint replacements. Compression molded UHMWPE/quartz composites with organosiloxane as a cross-linking agent for UHMWPE matrix, were tested in nanoindentation and nanowear.
Tang, C. Y. +5 more
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Modeling UHMWPE wear debris generation
Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2006AbstractIt is widely recognized that polyethylene wear debris is one of the main causes of long‐term prosthesis loosening. The noxious bioreactivity associated with this debris is determined by its size, shape, and quantity. The aim of this study was to develop a numerical tool that can be used to investigate the primary polyethylene wear mechanisms ...
H, Baudriller, P, Chabrand, D, Moukoko
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