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|Title: ||Wear Resistance of Porous High Pressure Crystallized UHMWPEs as Artificial Cartilage Biomaterials|
|Authors: ||Chou C. C.;Wang Y. C.|
|Contributors: ||NTOU:Department of Mechanical and Mechatronic Engineering|
|Issue Date: ||2011-10-20T08:09:38Z
|Publisher: ||the International Tribology ASIATRIB Congress (ASIATRIB 2010)|
|Abstract: ||Porous ultra high molecular weight polyethylenes (UHMWPEs) were prepared by molding a UHMWPE-based powder, which was mixed with NaCl particles, through a high pressure crystallization (HPC) process. Vitamin E (ï¡-tocopherol) was further incorporated into the porous material before the HPC process to obtain a higher degree of crystallinity. A solid UHMWPE without blending Vitamin E during HPC was also made as a benchmark. Differential scanning calorimetry was used to detect samplesâ crystallinity and oxidative stability. Infrared Spectra of the original and aged specimens were studied to compare their long-term oxidation behaviors. The surface morphology and the porosity of the freeze-fractured cross section were observed by a scanning electron microscope. The tribological properties, including wear rate and friction coefficient, of the UHMWPEs were investigated by implementing a pin-on-disk tester under the lubrication of a normal saline. The wear debris were collected and their dimensions were statistically analyzed to survey the possibility of biological response (osteolysis). The material properties of the porous UHMWPE containing vitamin E as a plasticizing agent and an antioxidant as well were discussed. The synergetic tribological performance of the mentioned material properties and the biomimetic porous structure under lubrication was addressed and concluded.|
|Appears in Collections:||[機械與機電工程學系] 期刊論文|
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