Effect of long‐term natural aging on the thermal, mechanical, and viscoelastic behavior of biomedical grade of ultra high molecular weight polyethylene

Fouad, H.

doi:10.1002/app.32290

Cited by 27 publications

(18 citation statements)

References 26 publications

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“…Simulated shelf aging is done by storing the UHMWPE specimens (packaged or unpackaged) at room temperature for several years [124]. Natural or real-time aging should reproduce the in vivo conditions (aqueous environment, temperature and oxygen concentration), taking also a long time to reach adequate aging effects [125][126][127]. Accelerated aging methods should shorten the oxidative degeneration time standardized in ASTM F2003 [128], which is divided into a thermal and oven aging protocol.…”

Section: Wear Tests With Aged Samplesmentioning

confidence: 99%

Wear testing of total hip replacements under severe conditions

Zietz

Fabry

Reinders

et al. 2015

Expert Review of Medical Devices

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Controlled wear testing of total hip replacements in hip joint simulators is a well-established and powerful method, giving an extensive prediction of the long-term clinical performance. To understand the wear behavior of a bearing and its limits under in vivo conditions, testing scenarios should be designed as physiologically as possible. Currently, the ISO standard protocol 14242 is the most common preclinical testing procedure for total hip replacements, based on a simplified gait cycle for normal walking conditions. However, in recent years, wear patterns have increasingly been observed on retrievals that cannot be replicated by the current standard. The purpose of this study is to review the severe testing conditions that enable the generation of clinically relevant wear rates and phenomena. These conditions include changes in loading and activity, third-body wear, surface topography, edge wear and the role of aging of the bearing materials.

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Section: Wear Tests With Aged Samplesmentioning

confidence: 99%

Wear testing of total hip replacements under severe conditions

Zietz

Fabry

Reinders

et al. 2015

Expert Review of Medical Devices

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“…All of the chemicals used in the experiments were analysis grade and were used without further purification. Titanium tetrabutoxide [Ti(OC 4 H 9Àn ) 4 ; 98%, Sinopharm Chemical Reagent Co., Ltd., Shanghai, China] was used as a titanium precursor. Cerium nitrate hexahydrate [Ce(NO 3 ) 3 Á6H 2 O; 99%, Sinopharm Chemical Reagent Co. Ltd., Shanghai, China] was used as a Ce source.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3] Among all polymer materials, ultrahigh-molecular-weight polyethylene (UHMWPE) has been considered a type of engineering plastic with many outstanding properties, including excellent mechanical properties, thermal stability, and corrosion resistance. [4][5][6] These features make UHMWPE a good candidate as a porous material for use in the separation processes. However, because of its hydrophobic characteristics, an apparatus fabricated from UHMWPE can be susceptible to contamination by impurities in the procedure of wastewater treatment; this affects the flux and limits its application.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of cerium‐doped titanium dioxide/ultrahigh‐molecular‐weight polyethylene porous composites with excellent photocatalytic activity

Gong

Zhou

Wang

et al. 2012

J of Applied Polymer Sci

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Porous ultrahigh‐molecular‐weight polyethylene (UHMWPE)‐based composites filled with surface‐modified Ce‐doped TiO2 nanoparticles (Ce–TiO2/UHMWPE) were prepared by template dissolution. The composites were characterized by Fourier transform infrared spectroscopy, ultraviolet (UV)–visible spectroscopy, diffuse reflectance spectra, and scanning electron microscopy); the photocatalytic activity was also evaluated by the decomposition of methyl orange under UV exposure. The results demonstrate that the severe aggregation of Ce–TiO2 nanoparticles could be reduced by surface modification via a silane coupling agent (KH570). The Ce–TiO2/UHMWPE porous composites exhibited a uniform pore size. Doping with Ce4+ effectively extended the spectral response from the UV to the visible region and enhanced the surface hydroxyl groups of the TiO2 attached to the matrix. With a degradation rate of 85.3%, the 1.5 vol % Ce–TiO2/UHMWPE sample showed the best photocatalytic activity. The excellent permeability of the porous composites is encouraging for their possible use in wastewater treatment. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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“…The chain scission process allows crystal growth to occur, increasing the degree of crystallinity of aged UHMWPE (Fouad [2010]). …”

Section: Ageing Of Uhmwpe and Uhmwpe-cnt Nanocompositesmentioning

confidence: 99%

“…Thus they can pack more efficiently into the lamellae leading to an increase in overall crystallinity and density (Kurtz [1999b]). The chain scission also affects the tie molecules by decreasing the effectiveness in supporting load leading to the breakage of the polymer long chains, reducing the molecular weight, increasing the brittleness, and weakening the properties of aged UHMWPE (Fouad [2010]). …”

Section: Ageing Of Uhmwpe and Uhmwpe-cnt Nanocompositesmentioning

confidence: 99%

Ultra High Molecular Weight Polyethylene and its Reinforcement with Carbon Nanotubes in Medical Devices

Guedes

Kanagaraj

Sreekanth

et al. 2015

Polyethylene‐Based Blends, Composites and Nanocomposites

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This chapter discusses the advantages and complexities of ultra high molecular weight polyethylene (UHMWPE) when used as a bearing material for total joint arthroplasty (TJA) and total knee arthroplasty (TKA). The UHMWPE internal structure and its mechanical response depend strongly on a diversity of factors that include radiation crosslinking, fiber reinforcement, and the addition of antioxidants such as Vitamin E or Vitamin C. All these manufacturing procedures induce morphological changes and simultaneously alter the mechanical properties of UHMWPE. The importance of UHMWPE on arthroplasty, including the advantages, the limitations and the strategies devised to overcome the known drawbacks are discussed in the first section. The following sections revise and discuss the biocompatibility, the manufacturing processes, the tribological behaviour, the aging by oxidation and irradiation of UHMWPE and UHMWPE-CNT nanocomposites. The last section analyses the viscoelastic behavior of UHMWPE and its implications on the long-term survival of total joint arthroplasty.

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Effect of long‐term natural aging on the thermal, mechanical, and viscoelastic behavior of biomedical grade of ultra high molecular weight polyethylene

Cited by 27 publications

References 26 publications

Wear testing of total hip replacements under severe conditions

Wear testing of total hip replacements under severe conditions

Preparation and characterization of cerium‐doped titanium dioxide/ultrahigh‐molecular‐weight polyethylene porous composites with excellent photocatalytic activity

Ultra High Molecular Weight Polyethylene and its Reinforcement with Carbon Nanotubes in Medical Devices

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