Probing lubricated sliding wear properties of HDPE/UHMWPE hybrid bionanocomposite

Sharma, V and Gupta, RK and Kailas, SV and Basu, B (2022) Probing lubricated sliding wear properties of HDPE/UHMWPE hybrid bionanocomposite. In: Journal of Biomaterials Applications .

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Abstract

Ultra-high molecular weight polyethylene (UHMWPE) and its derivatives have been clinically used as an acetabular liner material in total hip joint replacement (THR) over last six decades. Despite significant efforts, the longevity of UHMWPE implants is still impaired due to their compromised tribological performance, leading to osteolysis and aseptic loosening. The present study aims to critically evaluate and analyze the tribological performance, of the next generation acetabular liner material, that is, a chemically modified graphene oxide (GO) reinforced HDPE/UHMWPE (HU) bionanocomposite (HUmGO), against stainless steel (SS 316L) counterface in lubricated conditions. This work also provides a performance comparative assessment of HUmGO with respect to medical grades, UHMWPE (UC) and crosslinked UHMWPE (XL-UC). Significant attempts have been made to correlate the tribological properties (frictional behavior, wear rate, wear debris shape and size, wear mechanism) with the physicomechanical conditions (contact stresses) at sliding contact and the variation in molecular architecture of different UHMWPE materials. Additionally, an emphasis is put forward to critically anlyze the nature of lubrication regime based on the bearing characterstic parameters. HUmGO exhibited a lower COF (0.07) and specific wear rate (2.86 × 10−8mm3/Nm) than UC and XL-UC under identical sliding conditions. The worn surfaces on HUmGO revealed the signatures of less abrasive wear and limited deformation. Based on the estimated lambda (λ) ratio and Sommerfield number, all the investigated sliding contacts exhibited boundary lubrication. Taken together, the modified GO reinforced HDPE/UHMWPE bionanocomposite can be considered as a new generation biomaterial for the fabrication of acetabular liner for hip-joint prosthesis.

Item Type:	Journal Article
Publication:	Journal of Biomaterials Applications
Publisher:	SAGE Publications Ltd
Additional Information:	The copyright of this article belongs to the SAGE Publications Ltd.
Keywords:	Arthroplasty; Graphene; High density polyethylenes; Hip prostheses; Nonmetallic matrix composites; Reinforcement; Tribology; Wear of materials, Acetabular liners; Bio-nanocomposite; Boundary lubrications; Condition; Liner material; Sliding contacts; Sliding wear; Tribological performance; Wear mechanisms; XL-ultra-high molecular weight polyethylene, Ultrahigh molecular weight polyethylenes
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	13 Jul 2022 06:19
Last Modified:	13 Jul 2022 06:19
URI:	https://eprints.iisc.ac.in/id/eprint/74757

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