Duan Weipeng, Wu Meiping, Han Jitai, Ni Zifeng
School of Mechanical Engineering, Jiangnan University Wuxi 214122 China
RSC Adv. 2020 Jan 24;10(8):4175-4188. doi: 10.1039/c9ra09893c.
Recently, there has been increasing interest in modifying ultra-high molecular weight polyethylene (UHMWPE) due to glaring needs in the artificial joint replacement field. It is generally reported in the literature that irradiation cross-linking and adding graphene oxide (GO)/vitamin E (VE) can enhance the mechanical properties of UHMWPE, but this can sacrifice the oxidation stability and gel content. This paper examines how VE diffusion can influence irradiation cross-linked GO/UHMWPE composites and whether mechanical performance and oxidation resistance can be maintained simultaneously, which will provide new guidance for prolonging the longevity of UHMWPE implants. The GO/UHMWPE composites were fabricated by means of liquid ultrasonic dispersion, hot pressing and irradiation cross-linking, followed by VE diffusion and homogenization treatment. The results indicated that limited VE diffusion decreased the water absorption and wettability. The crystallinity, melting temperature, thermal stability, hardness and scratch resistance of the composites basically remain essentially the same, except in the case of pure UHMWPE. In addition, the oxidation resistance was improved significantly after incorporating VE. Furthermore, the diffusion and enhancement mechanisms were also demonstrated, respectively.
近年来，由于人工关节置换领域的迫切需求，对超高分子量聚乙烯（UHMWPE）进行改性的关注度日益增加。文献中普遍报道，辐照交联以及添加氧化石墨烯（GO）/维生素E（VE）可以提高UHMWPE的机械性能，但这可能会牺牲其氧化稳定性和凝胶含量。本文研究了VE扩散如何影响辐照交联的GO/UHMWPE复合材料，以及机械性能和抗氧化性能否同时保持，这将为延长UHMWPE植入物的使用寿命提供新的指导。通过液体超声分散、热压和辐照交联制备了GO/UHMWPE复合材料，随后进行VE扩散和均匀化处理。结果表明，有限的VE扩散降低了吸水性和润湿性。复合材料的结晶度、熔点、热稳定性、硬度和耐刮性基本保持不变，纯UHMWPE除外。此外，加入VE后抗氧化性显著提高。此外，还分别阐述了扩散和增强机制。
