Enhanced interfacial shear strength in ultra-high molecular weight polyethylene epoxy composites through a zinc oxide nanowire interphase

2021 ◽  
pp. 109218
Author(s):  
Kelsey Steinke ◽  
Henry A. Sodano
Keyword(s):  
Molecular Weight ◽  
Zinc Oxide ◽  
Shear Strength ◽  
High Molecular Weight ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Epoxy Composites ◽  
Zinc Oxide Nanowire ◽  
Ultra High Molecular Weight

The Effect of Surface Processing on the Protein Adsorption and Tribomechanical Properties of Ultra-High-Molecular Weight Polyethylene

2006 ◽  
Author(s):  
K. S. Kanaga Karuppiah ◽  
Sriram Sundararajan ◽  
Zhi-Hui Xu ◽  
Xiaodong Li
Keyword(s):  
Molecular Weight ◽  
Shear Strength ◽  
Protein Adsorption ◽  
High Molecular Weight ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Surface Finishing ◽  
Before And After ◽  
Physiological Fluid ◽  
Ultra High Molecular Weight

Ultra-high molecular weight polyethylene (UHMWPE) is a popular choice for the liner material of the acetabular cup and forms one of the articulating surfaces in total joint replacements (TJRs). Evaluating the tribological characteristics of UHMWPE on immediate contact with the physiological fluid is essential to understand pathways and mechanisms of eventual failure. In this study, the friction response and interfacial shear strength of a UHMWPE - ceramic interface was quantified using atomic force microscopy (AFM) before and after exposure to bovine serum albumin (BSA) solution. A 10% protein solution concentration was used to closely mimic protein levels in human physiological fluid. Medical grade UHMWPE samples with two different surface finishing treatments, milling and melting/reforming were used in the experiments. Friction response as a function of normal load was monitored on a particular area on each sample. Fluorescence microscopy was used to assess the protein adsorption on the test area. The interfacial shear strength of the interface was calculated from the friction data using contact mechanics. Contact angle measurements were also performed on the surfaces to evaluate the surface energies before and after protein adsorption. Correlations between the friction behavior and surface energy of the surfaces are discussed.

Effect of Crystallinity on the Friction Behavior of Ultra-high-molecular-weight-polyethylene

2006 ◽  
Vol 977 ◽  
Author(s):  
Kanaga Karuppiah Kanaga Subramanian ◽  
Angela L Bruck ◽  
Sriram Sundararajan ◽  
Zhiqun Lin
Keyword(s):  
Molecular Weight ◽  
Shear Strength ◽  
High Molecular Weight ◽  
Interfacial Shear Strength ◽  
Hold Time ◽  
Scratch Resistance ◽  
Interfacial Shear ◽  
Degree Of Crystallinity ◽  
Scanning Calorimetry ◽  
Ultra High Molecular Weight

AbstractIn this study we evaluate the interfacial shear strength and scratch resistance of medical grade ultra-high molecular weight polyethylene (UHMWPE) (GUR 1050 resin) as a function of polymer crystallinity. Crystallinity was controlled by heating UHMWPE samples to a temperature above its melting point and varying the hold time and cooling rates. Degree of crystallinity of the samples was evaluated using differential scanning calorimetry (DSC). Quantitative nanoscale friction experiments were conducted using an atomic force microscope with commercially available Si3N4 probes under dry conditions. A higher crystallinity resulted in lower friction force and lower interfacial shear strength as well as increased scratch resistance. The trend in friction response was observed in microscale friction measurements.

Biocomposite of Ultra-High Molecular Weight Polyethylene and Hydroxyapatite with Antibacterial Properties by the Incorporation of Zinc Oxide Nanoparticles

2018 ◽  
Vol 930 ◽  
pp. 258-263 ◽  
Author(s):  
R. Galli ◽  
M. Soares ◽  
L.P. Domingos ◽  
E.B. Batiston ◽  
Luciano Luiz Silva ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Zinc Oxide ◽  
High Molecular Weight ◽  
Zinc Oxide Nanoparticles ◽  
Antimicrobial Property ◽  
Antibacterial Properties ◽  
Oxide Nanoparticles ◽  
Standard Composition ◽  
Increasing Demand ◽  
Ultra High Molecular Weight

With the increasing demand of biomaterials, numerous studies have been developed seeking to improve its properties through new obtaining and manufacturing processes. This work aimed to aggregate antimicrobial property to a biocomposite constituted of a matrix of ultra-high molecular weight polyethylene (UHMWPEE) and hydroxyapatite, by the incorporation of zinc oxide nanoparticles. The samples were prepared based on a standard composition containing 95.0 wt% of UHMWPEE and 5.0 wt% of hydroxyapatite (blank). Three compositions were evaluated ranging the amount of zinc oxide nanoparticles incorporated in the standard sample. It was observed that the increase of zinc oxide concentration aggregate a good antibacterial property in the samples tested without cause significant changes in the mechanical properties of the composites.

scholarly journals Hybrid Self-Reinforced Composite Materials Based on Ultra-High Molecular Weight Polyethylene

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1739 ◽  
Author(s):  
Dmitry Zherebtsov ◽  
Dilyus Chukov ◽  
Eugene Statnik ◽  
Valerii Torokhov
Keyword(s):  
Molecular Weight ◽  
Shear Strength ◽  
High Molecular Weight ◽  
Flexural Modulus ◽  
Dsc Analysis ◽  
Uhmwpe Fiber ◽  
Lap Shear ◽  
Reinforced Composite ◽  
Hot Compaction ◽  
Ultra High Molecular Weight

The properties of hybrid self-reinforced composite (SRC) materials based on ultra-high molecular weight polyethylene (UHMWPE) were studied. The hybrid materials consist of two parts: an isotropic UHMWPE layer and unidirectional SRC based on UHMWPE fibers. Hot compaction as an approach to obtaining composites allowed melting only the surface of each UHMWPE fiber. Thus, after cooling, the molten UHMWPE formed an SRC matrix and bound an isotropic UHMWPE layer and the SRC. The single-lap shear test, flexural test, and differential scanning calorimetry (DSC) analysis were carried out to determine the influence of hot compaction parameters on the properties of the SRC and the adhesion between the layers. The shear strength increased with increasing hot compaction temperature while the preserved fibers’ volume decreased, which was proved by the DSC analysis and a reduction in the flexural modulus of the SRC. The increase in hot compaction pressure resulted in a decrease in shear strength caused by lower remelting of the fibers’ surface. It was shown that the hot compaction approach allows combining UHMWPE products with different molecular, supramolecular, and structural features. Moreover, the adhesion and mechanical properties of the composites can be varied by the parameters of hot compaction.

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