Influence of SBF-induced degradation on surface and tribological properties of irradiated GO/UHMWPE nanocomposites
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ORIGINAL RESEARCH
Influence of SBF‑induced degradation on surface and tribological properties of irradiated GO/UHMWPE nanocomposites Peipei Lu1 · Zifeng Ni1 · Guomei Chen2 · Meiping Wu1 Received: 15 July 2020 / Accepted: 10 November 2020 © Iran Polymer and Petrochemical Institute 2020
Abstract As a well-known biomaterial, ultra-high molecular weight polyethylene (UHMWPE) has been widely used as a substrate of artificial joints, due to its excellent biocompatibility, mechanical properties and anti-wear properties. In this work, graphene oxide (GO) and irradiation cross-linking are applied to enhance the performance of UHMWPE matrix, and then GO/UHMWPE nanocomposites were immersed in simulated body fluid (SBF) at 37 ℃ for 6 months to simulate the service environment of human body. The results showed that irradiation cross-linking treatment will promote the break and recombination of the molecular chains of UHMWPE and GO. The addition of GO which is followed by irradiation cross-linking method can increase the crystallinity and melting point, meanwhile, lead to a decrement in the friction coefficient and wear rate of the substrate. The average friction coefficient and wear rate were decreased to 0.1035 and 4.78 × 10–9 g N−1 m−1 under the simultaneous function of irradiation cross-linking and GO addition. However, after immersion in SBF for 6 months, their crystallinity, friction coefficient and wear rate were increased, resulting from the swelling reaction on the surface of GO/ UHMWPE nanocomposites. In conclusion, the cross-linking by irradiation and GO addition were utilized to synergistically enhance the surface and tribological properties of UHMWPE substrate, which further verifies that it is an effective method to lower the degradation of UHMWPE in SBF. The swelling reaction and anti-wear mechanism were also revealed in this work. Keywords Ultra-high molecular weight polyethylene (UHMWPE) · Irradiation cross-linking · Graphene oxide (GO) · Biotribological behaviors · Simulated body fluid (SBF)
Introduction Ultra-high molecular weight polyethylene (UHMWPE) has been widely used as an ideal implant material for total joint arthroplasty (TJA) [1–3], due to its excellent mechanical and bio-tribological properties [4]. However, during the longterm service for UHMWPE artificial prosthesis in human body, the excessive wear debris generated in joint tissue fluid can induce periprosthetic osteolysis and aseptic loosening [5, 6] as well as the mutation and necrosis of periprosthetic cells, leading to further revision surgeries, more suffering for patients and the shortening of the service life [7, 8]. * Meiping Wu [email protected] 1
School of Mechanical Engineering, Jiangnan University, Wuxi 214122, People’s Republic of China
School of Mechanical and Electrical Engineering, Wuxi Vocational Institute of Commerce, Wuxi 214153, People’s Republic of China
2
Meanwhile, there occurs oxidative degradation reaction, generating ketones, alcohols, esters and acids [9]. The oxygen content in body fluid condition is low,
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