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Topic: Ultra high molecular weight polyethylene

	Ultra high molecular weight polyethylene - Plastics Wiki
		Ultra high molecular weight polyethylene (UHMWPE), also known as high modulus polyethylene (HMPE) or high performance polyethylene (HPPE), is a thermoplastic.
		UHMWPE is a type of olefin and, despite relatively weak Van der Waals bonds between its molecules, derives ample strength from the length of each individual molecule.
		UHMWPE is synthesized from monomers of ethylene, which are bonded together to form what is called ultra high molecular weight polyethylene (or UHMWPE).
	plastics.inwiki.org /UHMWPE (0 words)

	Ultra High Molecular Weight Polyethylene -- Recommendations and Resources (Site not responding. Last check: )
		The ''number average'' molecular weight is the common average of the molecular weights of the individual polymers.
		It is determined by measuring the molecular weight of ''n'' polymer molecules, summing the weights, and dividing by ''n''.
		An alternative measure of the molecular weight of a polymer is the weight average molecular weight.
	www.becomingapediatrician.com /health/152/ultra-high-molecular-weight-polyethylene.html (666 words)

	Human body implant of graphitic carbon fiber reinforced ultra-high molecular weight polyethylene - Patent 4055862
		The higher molecular weight polyethylenes, i.e., those having molecular weights on the order of 400,000 to 600,000 and having linear characteristic, exhibit increased tendencies to incur "cold flow"; but these latter polymers display concomitantly lesser propensities toward stress cracking, after implantation.
		The term "ultra-high molecular weight" is used herein to describe polyethylene resins having a molecular weight of greater than about 1.5 million and preferably from about two million to about four million.
		The tibial plateau prosthesis 20a is characterized by the provision of a continuous, pre-shaped metal band 46 which encompasses the polyethylene body 22a in engagement with the semi-cylindrical sidewall 24a and the diametral face 26a.
	www.freepatentsonline.com /4055862.html (0 words)

	Ultra High Molecular Weight Polyethylene Powder, UHMWPE powder, MIPELON, Polyethylene Manufacturers
		This is in sharp contrast to the conventional polyethylene powder, whose typical weight is 20,000 to 300,000 microns.
		This UHMWPE powder also has very fine particles, measuring 25 to 30 microns versus the average particle size of conventional polyethylene powder which is 150 to 200 microns.
		This fine particle ultra-high molecular weight polyethylene powder's superior abrasion resistance and self lubrication qualities make it ideal for use as a performance additive in coatings, plastics, rubbers, and other materials.
	www.mitsuichemicals.com /mip.htm (0 words)

	High-speed spinning of ultra-high molecular weight polyethylene fibres
		In this procedure the polyethylene is dissolved in paraffin oil, in order to reduce the number of intermolecular entanglements which is necessary in order to obtain high draw ratios and tensile properties, and subsequently a fibre is spun from this solution, which is extracted and hot-drawn.
		In this process the spinline is stretched to very high ratios and at very high rates, and a fully oriented and crystalline fibre is obtained in a one step procedure.
		The aim of this thesis is to gain insight in the rheological phenomena that occur when solutions of ultra-high molecular weight polyethylene are exposed to elongational flow fields, and to use this insight to obtain strong fibres at high speeds in a one step process.
	dissertations.ub.rug.nl /faculties/science/1991/m.roukema (300 words)

	Dyneema - Wikipedia, the free encyclopedia
		Dyneema is a synthetic fiber based on ultra high molecular weight polyethylene, 15 times stronger than steel and up to 40% stronger than Kevlar.
		A precisely heated gel of UHMWPE is processed by an extruder through a spinneret.
		The end result is a fiber with a high degree of molecular orientation, and therefore exceptional tensile strength.
	en.wikipedia.org /wiki/Dyneema (708 words)

	High Performance Polyethylene Rope
		Polyethylene was first made in 1933 by Reginald Gibson and Eric Fawcett at Imperial Chemical Industries in England using a high-pressure reaction vessel.
		Polyethylene is a long chain of carbon and hydrogen atoms held together by covalent bonds.
		The molecular weight of UHMWPE is in the range of 4 to 6 million.
	www.precisionliftinc.com /polyrope.shtml (1104 words)

	Comparison of Polyethylene Wear (Site not responding. Last check: )
		Polyethylene was introduced as the acetabular bearing surface in total hip arthroplasty by Charnley due to the rapid failure of polytetrafluorethylene (PTFE).6, 34 The high density polyethylene (HDPE) used by Charnley had a molecular weight of approximately 500,000.
		Polyethylene is polymerized from resin by heat and pressurization and due to refinements in this technique the ultra high molecular weight polyethylene (UHMWPE) used today has a MW of 3,000,000.
		Polyethylene wear has been directly related to its molecular weight and numerous factors have been identified which can affect the molecular weight of the polyethylene and, thus, its wear characteristics.
	www.plasticspecialties.com /flash/resource/report.html (3791 words)

	Ultra Poly \| Product - UHMW Polythylene
		Ultra High Molecular Weight (UHMW) Polyethylene is often referred to as the world’s toughest polymer.
		UHMW is a linear high density polyethylene which has high abrasion resistance as well as high impact strength.
		Ultra Poly’s UHMW can be crosslinked, reprocessed, color-matched, machined and fabricated to meet most customer requirements.
	www.ultrapoly.com /Pages/pr_uhmw.html (165 words)

	Encyclopedia :: encyclopedia : Ultra high frequency (Site not responding. Last check: )
		Ultra high frequency (UHF) designates a range (band) of electromagnetic waves whose frequency is between 300 MHz (Wavelength 1 meter) and 3.0 GHz (Wavelength 10 centimetres).
		The main advantage of UHF transmission is that its high frequency means it has a physically short wave.
		Since the size of transmission and reception equipment (particularly antennas) is related to the size of the wave, smaller, less conspicuous antennas can be used than with VHF or lower bands.
	www.hallencyclopedia.com /Ultra_high_frequency (946 words)

	Brazilian Journal of Physics - Improvements of ultra-high molecular weight polyethylene mechanical properties by ... (Site not responding. Last check: )
		UHMWPE has evolved as the dominant material of choice in total joint prostheses because of its biocompatibility, relative superior friction, wear characteristics, ductility and impact load damping.
		The polyethylene wear particles generated at the articular surface have been recognized as a long-term cause of loosing and failure of the artificial hip joint due to osteolysis (local bone loss) [1].
		With the cross-linked bonds, the molecular chain mobility is reduced and the polymer surface presents therefore a higher hardness and an improved inertness.
	www.scielo.br /scielo.php?pid=S0103-97332004000800029&script=sci_arttext&tlng=en (3365 words)

	Ultra-High Molecular Weight Polyethylene (UHMWPE) (Site not responding. Last check: )
		Ultra-high molecular weight polyethylene (UHMWPE) is widely used in orthopedics, especially in the fabrication of articular components for arthroplasties, in particular, the acetabular cup or liner in a total hip joint replacement (THJR) and the tibial insert in a total knee joint replacement (TKJR).
		UHMWPE is used for these applications due to its excellent biocompatibility, high impact strength, remarkable wear resistance, and low friction coefficient.
		The lamellae (crystalline units of UHMWPE) are known to have an important influence on the mechanical properties of the polymer.
	www.dekker.com /sdek/28333205-81642673/abstract~db=enc~content=a713553976~words= (497 words)

	Composite material of continuous fiber and ultra high molecular weight polyethylene patent invention
		3,577,378 teaches that the added tensile and flexural strength and stiffness is due to the high strength and stiffness of the fibers coupled with the excellent mixing and distribution of the fibers in the polymer and the ease with which the molten FRP material flows in the extruder and injection mold.
		[0017] In one embodiment of the invention, the invention relates to composite material of continuous fibers and ultra high molecular weight polyethylene, the composite material comprising ultra high molecular weight polyethylene, and continuous high strength fibers, wherein the ultra high molecular weight polyethylene forms a continuous matrix among and surrounding the fibers.
		It is an object of the invention to provide a composite material of continuous fiber and ultra high molecular weight polyethylene (UHMW PE) exhibits many improved physical properties in comparison to both unreinforced and short fiber reinforced UHMW PE.
	www.freshpatents.com /Composite-material-of-continuous-fiber-and-ultra-high-molecular-weight-polyethylene-dt20051229ptan20050287891.php (2117 words)

	UHMW Polyethylene (Site not responding. Last check: )
		Ultra High Molecular Weight (UHMW) Polyethylene is 1/8 the weight of mild steel but is high in tensile strength and as simple to machine as wood.
		UHMW Polyethylene is well suited for applications that demand durability and low friction.
		UHMW Polyethylene will withstand intermittent temperatures of up to 212 °F, while at the same time being ideal for use in freezing lines.
	www.aetnaplastics.com /ws-uhmw.htm (130 words)

	Polyethylene
		Linear polyethylene is normally produced with molecular weights in the range of 200,000 to 500,000, but it can be made even higher.
		Polyethylene with molecular weights of three to six million is referred to as ultra-high molecular weight polyethylene, or UHMWPE.
		UHMWPE can be used to make fibers which are so strong they replaced Kevlar for use in bullet proof vests.
	www.pslc.ws /mactest/pe.htm (374 words)

	Properties of Vectra Liquid Crystal Polymer \| Vectran Fiber
		The molecular structure of Vectra, a wholly aromatic polyester, is shown in Figure 2.
		Fibers spun from such materials must be further oriented, generally through a combination of extrusion speed and post-spin drawing, to obtain higher tensile properties.Vectran's highly oriented structure is locked in directly during the melt-spinning process, thanks to the molecular structure and liquid crystalline nature of the starting polymer.
		Vectran / HS is different from other high-performance fibers such as aramid and ultra-high molecular weight polyethylene (HMPE).Vectran fiber is thermotropic, it is melt-spun, and it flows at a high temperature under pressure.
	www.vectranfiber.com /vectra_polymer.asp (227 words)

	Ultra High Molecular Weight Polyethylene, Ultra High Molecular Weight Polyethylene Manufacturers, Suppliers & Wholesaler
		Buyers can contact these Ultra High Molecular Weight Polyethylene manufacturers, suppliers and exporters by visiting their catalog or by sending request for information.
		Ultra High Molecular Weight Polyethylene manufacturers and suppliers from India.
		Ultra High Molecular Weight Polyethylene manufacturing and trading companies for their sourcing and buying requirements.
	www.indianindustry.com /plasticporducts/22414.html (314 words)

	Dispersion and rheological aspects of SWNTs in ultra high molecular weight polyethylene
		The SWNTs are adsorbed on the surface of the polymer powder.
		Crystallization of the UHMWPE melt followed by rheometry shows that the presence of SWNTs enhances the overall crystallization rate.
		The decrease in viscosity is attributed to the selective adsorption of the high molar mass fraction onto the nanotubes surface.
	www.nsti.org /Nanotech2006/showabstract.html?absno=282 (566 words)

	UHMW (Ultra-High Molecular Weight) Polyethylene:Tivar:abrasion resistance:noise reduction:corrosion, chemical resistant ...
		UHMW (ultra high molecular weight polyethylene) could be characterized as one of the miracle polymers of the 20th century.
		The key is UHMW's incredibly long molecular chain, which give UHMW a host of exceptional attributes such as high abrasion resistance, low coefficient of friction and unparalleled impact resistance, even in cryogenic environments.
		UHMW’s high molecular weight prevents it from being produced by methods typical of lower grade polymers.
	www.crownplastics.com (0 words)

	vgn-ext-hidden_PubMed
		In Part 2 of a study of welding of ultra-high molecular weight polyethylene (UHMWPE), experiments were conducted to measure the interfacial fracture energy of butt welds, for various welding times and temperatures above the melting point.
		Results from the model presented in Part 1 show that this corresponds to the maximum reptated molecular weight reaching close to the peak in the molar mass distribution.
		Since such interfaces exist around every powder particle in processed UHMWPE this problem cannot be avoided, and it must be accommodated in design of hip and knee bearing surfaces made from this polymer.
	www.plwc.org /portal/site/ASCO/menuitem.a3fb42726842a82627c4c291ee37a01d/?vgnextoid=d70b3608f9958010VgnVCM100000f2730ad1RCRD&index=n&pmid=16574221 (0 words)

	RADIATION AND MELT TREATED ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE PROSTHETIC DEVICES (WO9729793A1)
		The use of synthetic polymers, e.g., ultra high molecular weight polyethylene, with metallic alloys has revolutionized the field of prosthetic implants, e.g., their use in total joint replacements for the hip or knee.
		In response to the progressive ingress of these polyethylene particles between the prosthesis and bone, macrophage- induced resorption of the periprosthetic bone is initiated.
		The macrophage, often being unable to digest these polyethylene particles, synthesize and release large numbers of cytokines and growth factors which can ultimately result in bone resorption by osteoclasts and monocytes.
	www.delphion.com /details?pn=WO09729793A1 (970 words)

	The UHMWPE Handbook: Ultra-High Molecular Weight Polyethylene in Total Joint Replacement by Steven M. Kurtz
		UHMWPE is currently used in 1.4 million patients around the world every year for use in the hip, knee, upper extremities and spine.
		A major emphasis of this book is to describe the properties of these new highly crosslinked UHMWPE materials and to review the latest clinical results.
		The material used for these prosthetic joints is overwhelmingly comprised in part (normally as the socket in which a metal ball joint sits) of Ultra High Molecular Weight Polyethylene or UHMWPE.
	www.brightsurf.com /item.php?ASIN=0124298516 (510 words)

	Radiation and melt treated ultra high molecular weight polyethylene prosthetic devices patent invention
		In response to the progressive ingress of these polyethylene particles between the prosthesis and bone, macrophage-induced resorption of the periprosthetic bone is initiated.
		The pre-heated UHMWPE is then irradiated to a high enough total dose and at a fast enough dose rate so as to generate enough heat in the polymer to melt substantially all the crystals in the material and thus ensure elimination of substantially all detectable free radicals generated by, e.g., the irradiating step.
		The heated UHMWPE is irradiated so as to trap the polymer chains in the entangled state, and the irradiated UHMWPE is cooled to about 25.degree.
	www.freshpatents.com /Radiation-and-melt-treated-ultra-high-molecular-weight-polyethylene-prosthetic-devices-dt20051201ptan20050267594.php (1691 words)

	Steel wire framework intensifying ultra-high molecular weight polyethylene(UHMW-PE)pipe (Site not responding. Last check: )
		External wall of steel wire framework intensifying ultra-high molecular weight pipe adopts high-density polyethylene material, internal wall adopts high molecule weight polyethylene material.
		Electrocast is used in pipes connection, property of connection point is the same with that of pipe.
		High reliability, it can be used for 50 years.
	www.huahong-chem.com /prod1-e.htm (98 words)

	Polimersan POLIPOLEN® (Polyethylene) UHMW-PE 1000 (Site not responding. Last check: )
		POLIPOLEN® PE (POLYETHYLENE) is maintained from coke oven gas or from natural gas or from Ethene or Ethane which is produced by cracking of petroleum.
		Other differences of various PE types are according to their melting degrees and opposite proportional connection occurs according to their relative molecular weights.
		In other words, when its melting degree is at the lowest level, its relative molecular weight is at the highest level and e.g.
	www.matweb.com /search/SpecificMaterialText.asp?bassnum=PPOLIM07 (338 words)

	UHMW (Ultra-High Molecular Weight) Polyethylene:abrasion resistance:noise reduction:corrosion & chemical resistant ...
		UHMW Polymer is a Linear Polyethylene with a molecular weight in the range of 3,000,000 to 6,000,000.
		Therefore, UHMW Polymers have a molecular weight average 10 times that of conventional high density polyethylene resins.
		The higher molecular weight is what gives UHMW Polymers a unique combination of characteristics making it more suitable for many applications where lower molecular weight grades fail.
	www.crownplastics.com /UHMW.htm (165 words)

	imbepage2 (Site not responding. Last check: )
		Bell, J; Tipper, J L; Ingham, E; Stone, M H; Fisher, J: ‘The influence of phospholipid concentration in protein-containing lubricants on the wear of ultra-high molecular weight polyethylene in artificial hip joints’, Proc.
		Green, T R; Fisher, J; Stone, M H; Wroblewski, B M; Ingham, E; 'Polyethylene Particles of a 'Critical Size' are Necessary for the Induction of Cytokins by Macrophages In Vitro', Biomaterials, 19, pp 2297-2302.
		The Wear of Ultra High Molecular Weight Polyethylene Sliding on Metallic and Ceramic Counterfaces Representative of Current Femoral Surfaces in Joint Replacement, Advances in Medical Engineering, Editor D Dowson, The Institution of Mechanical Engineers, pp 109-116.
	www.leeds.ac.uk /imbe/imbepublications.htm (7483 words)

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