Results 241 to 250 of about 5,847,187 (287)

Thermal aging of cross-linked polyethylene

Annales de Chimie Science des Matériaux, 2006
L'effet du vieillissement thermique sur les proprietes mecaniques du polyethylene reticule chimiquement (PRC), utilise dans l'isolation des câbles de haute tension, a ete etudie. Nous avons montre que l'allongement a la rupture et la resistance a la traction du polymere diminuent en fonction du temps de vieillissement.
Larbi Boukezzi, Mohammed Nedjar, Leila Mokhnache, Mohammed Lallouani, Ahmed Boubakeur   +4 more
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Electrochemical treeing at contaminants in polyethylene and cross-linked polyethylene insulation

Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1973, 1973
A hypothesis is presented which may be stated as follows: “In cables, the inception of electrochemical trees at the site of contaminants, is independent of the nature of the contaminants; it is a consequence of the presence of gaps or weak boundary layers at the contaminant-insulation interface, where liquid can collect; certain liquids, under the ...
C. Katz, B. S. Bernstein
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History of the Irradiation Cross-Linking of Polyethylene

Journal of Macromolecular Science: Part A - Chemistry, 1981
Abstract The formation of covalent C-C bonds or cross-links between the long chains in polyethylene (PE) by means of high energy irradiation was first deduced from changes in the stress-strain curves of the PE samples after irradiations in vacuo in the heavy water pile of the Argonne National Laboratory near Chicago in the academic year 1947-48.
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Comparison of Cross-Linked Polyethylene Materials for Orthopaedic Applications

Clinical Orthopaedics and Related Research, 2003
Cross-linked polyethylenes are being marketed by orthopaedic manufacturers to address the problem of osteolysis caused by polyethylene particulate wear debris. Wear testing of these cross-linked polyethylenes in hip simulators has shown dramatic reduction in wear rate compared with standard ultrahigh molecular weight polyethylene, either gamma ...
John P, Collier, Barbara H, Currier, Francis E, Kennedy, John H, Currier, Graham S, Timmins, Simon K, Jackson, Robin L, Brewer   +6 more
openaire   +2 more sources

Fracture of a Cross-Linked Polyethylene Liner Due to Impingement

The Journal of Arthroplasty, 2009
We report a case of fracture at 2 years after implantation of a 50-kGy moderately cross-linked ultrahigh molecular weight polyethylene liner with an extended lip (Marathon, DePuy, Warsaw, IN). The extended lip section had fractured. The liner showed no oxidation.
Gavan P, Duffy, Keith K, Wannomae, Shannon L, Rowell, Orhun K, Muratoglu   +3 more
openaire   +2 more sources

SHORT-TERM IN VIVO WEAR OF CROSS-LINKED POLYETHYLENE

The Journal of Bone and Joint Surgery-American Volume, 2004
Cross-linked polyethylene was developed to reduce volumetric wear in prosthetic joints. Hip simulator studies have shown promising results with regard to wear reduction. This study evaluated the short-term in vivo wear of a moderately cross-linked polyethylene.Linear head penetration, as an assessment of in vivo polyethylene wear, was measured in two ...
Christian, Heisel, Mauricio, Silva, Mylene A, dela Rosa, Thomas P, Schmalzried   +3 more
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Highly Cross-linked Polyethylene in Total Hip Arthroplasty

Journal of the American Academy of Orthopaedic Surgeons, 2006
Although total hip arthroplasty is a common and highly successful procedure, its long-term durability has been undermined by the cellular response to polyethylene wear debris and the subsequent effects on periprosthetic bone. Research elucidating the effects of sterilization on polyethylene wear has facilitated the development of a more wear-resistant ...
Alexander C, Gordon, Darryl D, D'Lima, Clifford W, Colwell   +2 more
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Etching and the Morphology of Cross-Linked Polyethylene Cable Insulation

IEEE Transactions on Electrical Insulation, 1983
The techniques of etching by carbon tetrachloride vapor and by permanganic acid are shown to be prone to artifacts, and so earlier conclusions based on these techniques, i.e. that XLPE cable insulation has a large scale (>> 10 ?m) spherulitic texture structure, need to be reexamined. A comparison with XLPE film samples, where spherulite size is readily
Bamji, S. S., Bulinski, A. T., Densley, R. J., Garton, A.   +3 more
openaire   +1 more source

Space charge behavior of chemically cross-linked and radiation cross-linked polyethylene

2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132), 2002
This paper presents results of an investigation having the aim to compare electrical and oxidative performances of chemically and radiation cross-linked polyethylene. Gamma irradiated and peroxide crosslinked specimens are characterized through dc space charge observations, as well as ac electric strength and oxidation induction time measurements ...
L. Martinotto, F. Peruzzotti, F. Palmieri, G.C. Montanari, S. Rai   +4 more
openaire   +1 more source

The effect of cross-linking and cross-linking agent by-products on tree growth in polyethylene

Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1976, 1976
This paper summarizes a study of the effect of cross-linking processes and by-products of cross-linking on electrochemical tree growth in polyethylene insulated cables. The investigations dealt with cables cross-linked by radiation and chemically by peroxides.
N. N. Srinivas, S. M. Allam, H. C. Doepken   +2 more
openaire   +1 more source