UHMWPE is a specific type of polyethylene (PE): a linear, semi crystalline homopolymer with high molecular mass. Orthopaedic medical grade UHMWPE typically …
UHMWPE fibres were obtained directly from stirred solutions (Zwijnenburg, 1978) with a tensile strength of 2.9 GPa and a Youngs modulus of 101 GPa. Discovery of the so-called gel-spinning process
UHMWPE Sheet Versatility. Owing to this rare combination of strength, flexibility and resistance, UHMWPE sheets provide versatile utility across manufacturing applications - from parts subject to daily wear-and-tear to custom equipment for hazardous chemical processing.. Engineers increasingly prefer this advanced polymer in replace of …
Recently, highly crosslinked UHMWPE (HXPE) materials were introduced based on the finding that crosslinking reduces wear. These first generation HXPE materials were produced by irradiation followed by heating below the melting temperature (annealing) or above the melting temperature (remelting). Both classes of HXPE material have …
1.. IntroductionFor over four decades, ultra high molecular weight polyethylene (UHMWPE) has been used as one-half of the metal- or ceramic-on-plastic bearing couple in total joint replacement (TJR) components due to its toughness, durability, and biological inertness (Kurtz, 2004).Though there are metal-on-metal and ceramic-on …
The extremely high these procedures, UHMWPE is dened as a substantially molecular weight of this resin, which is commercially linear polyethylene (PE) having a relative …
Raw materials. Ultra-high molecular weight polyethylene (UHMWPE) was purchased from Ticona (GUR 400 Fine, USA) with the molecular weight of 2.0 X ({10}^{6}) g/mol. GUR 400 Fine is synthesized through a special catalysis process. It has much less fibrous structures among particles and smaller particle sizes [], which makes it very low …
Medical-grade polyethylene (UHMWPE with an average molecular mass of >2,000,000 a.m.u.) is a semicrystalline polymer that can be depicted as a set of ordered regions (crystalline lamellae) embedded in a disordered amorphous phase [].The degree of crystallinity is an important parameter: higher crystallinity gives a larger modulus of …
Introduction. Ultra-high molecular weight polyethylene (UHMWPE) is the most used biomaterial in orthopedic joint prosthesis, with its use dating back to the 1960s'.1–3 UHMWPE has a semicrystalline structure, with around …
Ultrahigh molecular weight polyethylene (UHMWPE) has been used as a bearing material for an acetabular prosthesis component in hip and knee total joint replacement due to its unique characteristics, such as high impact strength, good biocompatibility and low friction coefficient [].But the use of UHMWPE has been limited …
Highly oriented UHMWPE films were reinforced with functionalized graphene nanoplates (GNP). GNP was functionalized by deposition of polyaniline (PANI) on the GNP surface. The structure of GNP/PANI was studied by Raman spectroscopy, and the structure of xerogels and films based on UHMWPE was studied by DSC and SEM. PANI promotes …
Ultra-high-molecular-weight polyethylene (UHMWPE) has been the bearing material of choice in total hip replacement for over 50 years. It is the goal of this chapter to provide the practicing surgeon with basic knowledge and science of UHMWPE and to discuss key issues of UHMWPE as they apply to clinical performance.
The first conventional UHMWPE material was a control, , unirradiated material. The second conventional UHMWPE material was gamma radiation sterilized in nitrogen with a dose of 30 kGy (referred to as "30 kGy,γ-N 2 "). The two highly crosslinked UHMWPEs were both gamma irradiated in air with a dose of 100 kGy.
erties of the UHMWPE for the end user: density and stiff-ness increase, while strength, ductility and toughness are reduced, with an adverse effect on wear and fatigue en-durance (9, 13-17). Oxidation may increase for years after irradiation, and in implanted devices it has been reported to reach the maximum concentration about 0.5 …
UHMWPE exposed to sterilization levels of radiation (25–35 kGy) typically exhibits greater than 75% gel, with higher radiation doses approaching gel. In D2765 Method A, the sample is carefully weighed, packaged in a preweighed porous stainless steel mesh bag, then placed in a flask containing boiling xylene or decahydronapthalene …
L'utilisation régulière des tronçonneuses implique l'achat d'une rectifieuse spéciale.: Regular use of chainsaws involves the purchase of a special grinding machine.: Les incisions sont réalisées par une rectifieuse.: The incisions are performed by a grinding machine.: Notre rectifieuse automatique produit rapidement des extrémités planes et …
2.2. Fabrication Process of UHMWPE Porous Specimens. A sintering device, shown in Figure 1, was specially designed and prepared for sintering samples, mainly including a forming mold whose cavity was a regular cuboid shape with sizes of 50 × 25 × 5 mm 3, an electric heating jacket heating system (including a temperature control cabinet …
Frictional and Wear Properties of Surface Porous UHMWPE Figure 11 shows the effect of the addition of GO (1 wt %) and NaCl (10%) on COF and í µí¼ of four samples (UHMWPE, UHMWPE with NaCl ...
Show abstract. ... Thus, ultra-high molecular weight polyethylene (UHMWPE), with chains consisting of up to 200,000 monomers per molecule (HDPE only ca 1700) and molecular weight from 2 to 6 ...
Abstract. This book describes the science, development, properties and application of of ultra-high molecular weight polyethylene (UHMWPE) used in artificial joints. This material is currently ...
Ultrahigh molecular weight polyethylene (UHMWPE) belongs to an emerging class of high-performance specialty polymers with a unique set of properties and …
26.1. Introduction. Radical reaction pathways govern the cross-linking, degradative, and stabilization reactions of UHMWPE. For these reactions to occur, macroradicals must be induced in the polymer, for example, by high-energy radiation or by thermal or photo decomposition of hydroperoxides and peroxides, which leads to …
UHMWPE films were fabricated by compression molding (Craver Press, 4386 CH) UHMWPE powders at 175°C and 30 MPa into circular discs of 115 mm in diameter and 500 μm in thickness. Each as molded sample was cut into rectangular shape. The pre-cut sample was then sandwiched between copper heating platens and fastened …
The penetration depth as a function of wavelength, and anisotropic nature of UHMWPE over the aforementioned wavelength range has been discussed on the basis of experimental results. 2. Material s and methods. A commercially available medical grade of UHMWPE (GUR 1020 provided by Ticona) was in used in compression molded sheets …
Ultra-high molecular weight polyethylene (UHMWPE) is the most common bearing material in total joint arthroplasty due to its unique combination of superior mechanical properties and wear resistance over other polymers. A great deal of research in recent decades has focused on further improving its performances, in order to provide …
Abstract. There are many properties to consider when developing a new ultra-high molecular weight polyethylene (UHMWPE) material for implant applications. The …
Introduction. UHMWPE is a kind of linear polyethylene with viscosity average molecular weight (M η) larger than 3.0 × 10 6 g · mol −1 [1]. The unique merits such as light-weight, non-toxicity, hydrophobicity, weak adhesion, low surface tension, high impact resistance, high abrasive resistance, good chemical resistance, self-lubrication and eco …
Ultrahigh molecular weight polyethylene (UHMWPE) is a versatile polymer with outstanding properties and applications in various fields. This article reviews the latest advances in the synthesis, characterization, processing and performance of UHMWPE, covering topics such as catalyst design, molecular structure, rheology, morphology, …
Moreover, UHMWPE exhibits the best sliding wear resistance and impact toughness and thus has been used to replace steel in many applications requiring wear resistance . Since 1962, UHMWPE has been used in orthopedics as a bearing material for joint implants. Nowadays, around 1.4 million joint replacement procedures are …
Vitesse de broche: 1 640 rpm Puissance: 3 kW Distance entre les axes: 400, 650 mm. La S20 est une rectifieuse cylindrique universelle avec entraînements électromécaniques pour l'usinage de petites pièces. Elle dispose d'une distance entre pointes de 400 / 650 mm et d'une hauteur de pointes de 100 mm. ...
Docks and dock fenders are commonly made of UHMW and for good reason. This plastic is water-resistant and can withstand moisture for an extended period of time. It's also abrasion-resistant and can easily withstand impact when watercrafts bump up against it while docking–there is little or no chance of it showing damage.
UHMWPE TECHNICAL DATA SHEET UHMW-PE is a subset of the thermoplastic -polyethylene. It has extremely long chains, with molecular weight numbering in the millions, usually between 2 and 6 million, strengthening intermolecular interactions resulting in highest impact strength of any thermoplastic very low coefficient of friction ...
Introduction. Reducing osteolysis has been the driving force behind the development of a new generation of UHMWPEs. The occurrence of osteolysis in cementless hip implants has led to its realization as a clinical problem associated mainly with UHMWPE implant wear particles [].Sterilization of UHMWPE with gamma radiation …
The modified UHMWPE with the diameter of 58–75 μm has the lowest friction coefficient in calf serum which is about 0.075. The wear tests of knee joint moving simulator show that the pure UHMWPE has the highest wear rate, about 8 × 10−7 mm3(N · m)−1 and the wear rate of grafted UHMWPE decreases gradually water with the …
Abstract. According to a survey conducted by Grand View Research, the market demand for medical grade UHMWPE has raise remarkably from 60.9 kilotons up to 204.8 kilotons during 2015–2024 valued at $1.36 billion (USD) with a compound annual growth rate of 15%. There are various materials available for medical implants …
