Influence of molecular weight of modified ultrahigh-molecular-weight polyethylene with Cu(II) chelate of bissalicylaldehydeethylenediamine on wear-resistant materials

Abstract

Reciprocating friction and wear performances of pure ultrahigh-molecular-weight polyethylenes (UHMWPEs) with molecular weights (MWs) of 2, 3, 5, and 9 million and their modified UHMWPEs with 15 wt.% Cu(II) chelate of bissalicylaldehyde-ethylenediamine (add1) against titanium alloy (Ti6Al4V) were investigated under boundary lubrication with 25 vol.% calf serum deionized water solution. Differential scanning calorimetry (DSC) of purchased UHMWPE powders was performed. The enthalpy changed with an increase in MW. UH300 had the lowest temperature of an extrapolated peak and the best peak symmetry in DSC analysis. The friction coefficient curves of molded pure and modified UHMWPEs/Ti6Al4V were compared, and the volume loss by the wear of polymers was measured. 3D topographies of the worn surfaces of polymers and images of the worn surfaces of polymers and titanium alloy against polymers were analyzed by confocal white light microscopy and scanning electron microscopy, respectively. Results showed that the influence of MW of UHMWPE was obvious on the friction and wear characteristics of pure UHMWPEs and 15% add1 UHMWPEs. An MW of 3 million was the best to reduce the friction of rubbing pairs, enhance the wear resistance of pure UHMWPEs and 15% add1-UHMWPEs, and improve the mating properties of Ti6Al4V.

Wear Resistance Mechanism of Ultrahigh-Molecular-Weight Polyethylene Determined from Its Structure–Property Relationships

“…This finding suggests that the wear resistance of polyethylene samples improved upon increasing the molecular weight. Moreover, the wear performance tends to be more stable at higher molecular weights, which is a general trend. ,, …”

“…Moreover, the wear performance tends to be more stable at higher molecular weights, which is a general trend. 9,18,19 The morphologies of worn surfaces of the polyethylene samples were observed to determine their degrees of wear and to investigate the possible wear mechanisms. Figure 4 presents the SEM images of the worn surfaces of the polyethylene samples after sliding wear test.…”

Burst Pressures of High-Density Polyethylene Pipes Considering the Notch Effect: Testing and Prediction

“…Polymer composites have been investigated in many industries considering the requirements of functionality and structural integrity in recent years [1,2,3,4,5]. Among these polymers, HDPE is widely applied in chemical and petrochemical engineering, nuclear plant and other industries as pipelines or membranes owing to its good comprehensive performance of light weight, corrosion and wear resistance, mechanical properties and low cost.…”