Characterization of Physical, Chemical, and Mechanical Properties of UHMWPE

Spiegelberg, Stephen H.; Kozak, Adam; Braithwaite, Gavin

doi:10.1016/b978-0-323-35401-1.00029-6

Cited by 26 publications

(26 citation statements)

References 19 publications

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“…OIT was determined to compare the antioxidative potential of the materials. e values were in the same range as mentioned in the literature [54]. e large variance did not permit any reliable conclusions about the role of the dose.…”

Section: Oxidation Induction Timementioning

confidence: 64%

“…In contrast to the findings of Wannomae et al no deleterious effect of the X-ray irradiation on the antioxidative potency was asserted [43]. Although the reliability of this measurement is controversially discussed particularly for low OIT values (<15 minutes) [57], this method is described to be helpful for assessing and ranking the antioxidative potential of antioxidant-containing UHMWPEs [54,58]. As the test is conducted under very harsh conditions which absolutely do not correspond to in vivo aging, it serves exclusively the material comparison and a correlation with the clinical behavior remains to be established.…”

Section: Oxidation Induction Timementioning

confidence: 91%

“…e extraction test verified that all the materials were highly cross-linked. As a gel fraction of 75% is typically reached after sterilization with 25-35 kGy [54] higher doses lead systematically to gel fractions between 90% and 100% making the differentiation of the materials based on this parameter difficult. However, some tendencies could be seen.…”

Section: Gel Fractionmentioning

confidence: 99%

“…One reason for this discrepancy might be the error in the measurement of the swollen mass which increases as the swell ratio decreases [35]. Another reason might be the fact that the cross-link density was determined at 130°C, whereby the melting range of UHMWPE extends from 50°C to 160°C [54]. In this way, much more short chains and entanglements still remain and bias the determination of the cross-link density.…”

Section: Cross-link Densitymentioning

confidence: 99%

See 3 more Smart Citations

Influence of Irradiation Temperature on Oxidative and Network Properties of X-Ray Cross-Linked Vitamin E Stabilized UHMWPE for Hip Arthroplasty

Mulliez

Schilling²,

Grupp

2020

BioMed Research International

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Previous studies have shown that increased cross-link density, reduced free radicals, and increased antioxidant grafting resulting from electron-beam irradiation at elevated temperatures improved the wear performance and the oxidative stability of vitamin E blended UHMWPE. The current study explores the impact of elevated irradiation temperature on vitamin E blended UHMWPE using X-ray. We hypothesize that the effects of temperature would be similar to those observed after electron-beam irradiation due to the relatively high dose rate of X-rays. Two X-ray doses of 80 and 100 kGy and two irradiation temperatures, that is, room temperature and 100°C were considered. The reference was Vitelene®, a vitamin E stabilized polyethylene cross-linked with 80 kGy by e-beam at 100°C. Oxidation index and oxidation induction time, as well as cross-link density, gel fraction, and trans-vinylene index, were determined, as the oxidative and network properties are decisive for the long-term implant performance. Gel fraction and oxidation induction time were significantly improved subsequently to warm irradiation in comparison with the material irradiated at room temperature. In conclusion, X-ray irradiation at elevated temperatures resulted in an increase of cross-linking and oxidative resistance of vitamin E stabilized polyethylene comparable to those of e-beam irradiated UHMWPE.

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Section: Oxidation Induction Timementioning

confidence: 64%

Section: Oxidation Induction Timementioning

confidence: 91%

Section: Gel Fractionmentioning

confidence: 99%

Section: Cross-link Densitymentioning

confidence: 99%

See 2 more Smart Citations

Influence of Irradiation Temperature on Oxidative and Network Properties of X-Ray Cross-Linked Vitamin E Stabilized UHMWPE for Hip Arthroplasty

Mulliez

Schilling²,

Grupp

2020

BioMed Research International

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“…Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions INTRODUCTION Ultrahigh molecular weight polyethylene (UHMWPE), is a unique polymer with outstanding physical and mechanical properties (i.e., high strength and stiffness, good fatigue, and wear characteristics), and is widely used in joint replacement prostheses in the human body [1][2][3][4] . However, due to the low surface hardness and poor wear resistance of the polymer, wear particles lead to osteolysis.…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

Optimization of UHMWPE/Graphene Nanocomposite Processing using Ziegler-Natta Catalytic System via Response Surface Methodology

Shafiee

2014

Polymer-Plastics Technology and Engineering

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Optimization of operational conditions for the preparation of Ultrahigh-molecular-weight polyethylene (UHMWPE)/Graphene nanocomposites with Ziegler-Natta catalyst was carried out via response surface methodology (RSM). This study deals with the optimization of process variables to optimize the productivity and molecular weight. A three-factor, three-level Box-Behnken design with temperature (X 1 ), monomer pressure (X 2 ), and [Al]/[Ti] molar ratio (X 3 ) as the independent variables were selected for the study. The dependent variables were productivity and molecular weights of the final nanocomposites. It was developed by using the three parameters at three levels including 50, 60, and 70 C for temperature; 4, 6, and 8 bar for pressure; and 176, 318, and 460 for [Al]/[Ti] molar ratios. The optimum reaction conditions derived via RSM were: temperature 60 C, pressure 8 bar, and [Al]/[Ti] molar ratio 242. Productivity and molecular weight were 2107 g PE/mmol Ti.h and 3.7 Â 10 6 g/mol, respectively, under optimum conditions. Morphological information was determined by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Obtained results show that graphene layers in these nanocomposites were completely exfoliated and dispersed uniformly in the polyethylene matrix while no nanoparticle cluster was formed.

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Effects of simulated oxidation on thein vitrowear and mechanical properties of irradiated and melted highly crosslinked UHMWPE

et al. 2015

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Radiation crosslinked ultrahigh molecular weight polyethylene (UHMWPE) have reduced the wear rate of the bearing surface in total joint arthroplasty and the incidence of peri-prosthetic bone loss due to wear particles. The oxidation potential afforded to the material by the trapped residual free radicals after irradiation was addressed in first generation crosslinked UHMWPEs by using thermal treatments such as annealing or melting after irradiation. Postirradiation melted crosslinked UHMWPE did not contain detectable free radicals at the time of implantation and was expected to be resistant against oxidation for the lifetime of the implants. Recent analyses of long-term retrievals showed it was possible for irradiated and melted UHMWPEs to oxidize in vivo but studies on the effects of oxidation on these materials have been limited. In this study, we determined the effects of in vitro aging on the wear and mechanical properties of irradiated and melted UHMWPE as a function of radiation dose and found that even small amount of oxidation (oxidation index of 0.1) can have detrimental effects on its mechanical properties. There was a gradual increase in the wear rate below an oxidation index of 1 and a drastic increase thereafter. Therefore, it was shown in a simulated environment that oxidation can have detrimental effects to the clinically relevant properties of irradiated and melted UHMWPEs.

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Characterization of Physical, Chemical, and Mechanical Properties of UHMWPE

Cited by 26 publications

References 19 publications

Influence of Irradiation Temperature on Oxidative and Network Properties of X-Ray Cross-Linked Vitamin E Stabilized UHMWPE for Hip Arthroplasty

Influence of Irradiation Temperature on Oxidative and Network Properties of X-Ray Cross-Linked Vitamin E Stabilized UHMWPE for Hip Arthroplasty

Optimization of UHMWPE/Graphene Nanocomposite Processing using Ziegler-Natta Catalytic System via Response Surface Methodology

Effects of simulated oxidation on thein vitrowear and mechanical properties of irradiated and melted highly crosslinked UHMWPE

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