Effect of accelerated aging on the thermo-mechanical behavior and biotribological properties of an irradiation cross-linked GO/UHMWPE nanocomposite after VE diffusion
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Abstract
In this work, the influence of accelerated aging on the thermo-mechanical behavior and biotribological properties of an irradiation cross-linked GO/UHMWPE nanocomposite after VE diffusion was investigated, including through differential scanning calorimetry (DSC), gel content, FT-IR characterization, oxidation index, ball indentation hardness, and especially the biotribological properties. The results show that accelerated aging increased the melting point and crystallinity of the nanocomposite, but resulted in a decrease in thermal stability and gel content. The oxidation index increased by 60.2% and the hardness decreased by 18.1%. In particular, the friction coefficient and wear rate increased by 99.5% and 87.4% respectively. A simple VE diffusion process had no obvious effect on the melting point, crystallinity, thermal stability, gel content and hardness, but the oxidation resistance and biotribological performance were improved to a certain extent. On the contrary, when VE exists in the accelerated aging process, the above properties are significantly improved. In particular, the oxidation index decreased by 21.1%, and the friction coefficient and wear rate decreased by 33.7% and 26.4%, respectively. After accelerated aging, fatigue wear and abrasive wear are the main wear forms, while VE plays the function of reducing friction and wear. Besides, the anti-friction and wear resistance mechanism of VE during the accelerated aging process was also illustrated.
本研究通过差示扫描量热法(DSC)、凝胶含量、傅立叶变换红外特性、氧化指数、球压痕硬度,特别是生物滴定特性,研究了加速老化对辐照交联后的 GO/UHMWPE 纳米复合材料的热力学行为和生物滴定特性的影响。结果表明,加速老化提高了纳米复合材料的熔点和结晶度,但导致热稳定性和凝胶含量下降。氧化指数增加了 60.2%,硬度降低了 18.1%。摩擦系数和磨损率分别增加了 99.5% 和 87.4%。简单的 VE 扩散过程对熔点、结晶度、热稳定性、凝胶含量和硬度没有明显影响,但抗氧化性和生物分布性能得到了一定程度的改善。相反,当 VE 存在于加速老化过程中时,上述性能得到明显改善。其中,氧化指数降低了 21.1%,摩擦系数和磨损率分别降低了 33.7% 和 26.4%。加速老化后,疲劳磨损和磨料磨损是主要的磨损形式,而 VE 则起到了减少摩擦和磨损的作用。此外,还说明了 VE 在加速老化过程中的抗摩擦和抗磨损机理。
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