Effect of γ-Ray irradiation on surface oxidation of ultra high molecular weight polyethylene/zirconia composite prepared byin situ ziegler-natta polymerization

Abstract

Novel ultra-high molecular weight polyethylene (UHMWPE)/zirconia composites were previously prepared by the in situ polymerization of ethylene using a Ti-based Ziegler-Natta catalyst supported on to the surface of zirconia, as a bearing material for artificial joints. Tribological tests revealed that a uniform dispersion of zirconia in UHMWPE markedly increased the wear resistance. The effects of zirconia content on the oxidation behavior of the γ-ray-treated UHMWPE/zirconia composite surfaces were examined. The oxidation index that estimates the oxidation degree as the content of total carbonyl compounds was monitored using Fourier transform infrared spectroscopy-attenuated total reflectance. The changes in the surface composition due to the oxidation were confirmed by electron spectroscopy for chemical analysis. The extent of oxidation decreased with increasing zirconia content, which was attributed to the increased crystallinity as well as the decreased polymer portion of the UHMWPE/zirconia composites.

Friction and wear properties of graphene oxide/ultrahigh‐molecular‐weight polyethylene composites under the lubrication of deionized water and normal saline solution

“…After curve‐fitting, the peak of the C 1s electrons at 284.50 eV, shown in Figure (b,c), corresponded with the CC and CH bonds of the UHMWPE in both the DW and NS lubricating conditions . The small peaks from 286.00 to 289.00 eV (those at 286.65, 287.70, and 289.00 eV corresponded to the CO, CO, and OCO groups, respectively) indicated the formation of surface photooxidation products caused by air . Moreover, the spectra showed that the film contained oxygen in addition to carbon.…”

Fabrication and Evaluation of Mechanical and Tribological Properties of ultra-high-molecular-weight polyethylene-based Nanocomposites Reinforced with Hydroxyapatite, Zirconia and Multi-walled Carbon Nanotubes

“…Fabricating UHMWPE-based composite, using different types of additives such as HA [9], Carbon Nanofibers [10], Carbon Nanotubes [11], Zirconia [12,13], and Alumina [14] or even using some additives such as Zirconia and HA at the same time [15] in order to reduce the wear rate of this polymer has been widely investigated. Recent evidence suggests that the powder mixing method and the fabrication method may significantly impact the final composites' properties [10,16].…”

Quantitative evaluation of scratch-induced damage on polymer surfaces using a colorimetric analysis

“…[1][2][3][4] One of the major issues on polymer scratch study is the standardization of test methodologies and appropriate evaluation techniques that can precisely quantify the scratch damage on polymer surfaces. [1][2][3][4] In recent years, two global test methods for obtaining meaningful and reproducible results on the scratch behaviors of polymers have been proposed. One is an ASTM standard (D7027-05).…”