Ultrahigh Molecular Weight Polyethylene UHMWPE

Dentures acrylic, ultrahigh molecular weight polyethylene (UHMWPE), epoxy Facial prosthesis acrylic, PVC, polyurethane (PUR)... 

In spite of processing difficulties, some higher-molecular-weight polymers, such as ultrahigh-molecular-weight polyethylene (uhmwpe), are used because of their superior toughness. 

Enhancing the wear resistance of polymers (e.g. ultrahigh molecular weight polyethylene — UHMWPE — used for in vivo implants such as artificial hip joints).256... 

Polymers of MMA, AAc, and MAA were grafted onto an ultrahigh molecular weight polyethylene (UHMWPE) fiber surface after pretreatment with electron beam irradiation [31]. Sundell et al. [32] pretreated a PE film with electron beams to facilitate the graft polymerization of vinyl benzylchloride onto the substrate. The inner surface of porous PE hollow fiber had also been modified by grafting of glycidyl methacrylate (GMA) polymer after electron beam irradiation [33]. 

Ultrahigh molecular weight polyethylene (UHMWPE) is an engineering plastic which has a wide spectrum of applications, particularly as a material for orthopedic prostheses due to its high strength, high resistance to chemicals and physical abrasion, high wear... 

Bioinert materials are materials that display minimal, if any, interaction with surrounding tissues examples of these are titanium and its alloys, alumina, partially stabilised zirconia, carbon and possibly ultrahigh molecular weight polyethylene (UHMWPE). In the case of bioinert materials bone remodelling occurs by a shape-mediated contact osteogenesis. 

Ultrahigh molecular weight polyethylene (UHMWPE) is really a variety of HDPE with a molecular weight greater than 3 x 106. UHMWPE is a strong and lightweight plastic used in the fibre industry and for specialized applications such as its use in medicine for the manufacture of artificial hips. 

Figure 3.1-4 A series of infrared spectra which show in situ monitoring of impregnation of CpMn(CO)3 from the CO2 solution into a film of ultrahigh-molecular-weight polyethylene (UHMWPE). A solution of CpMn(CO)3 in heptane (8 pL, ca. 0.1 M) was injected into the FTIR cell. After evaporation of the solvent, the cell was opened and an UHMWPE disk (250 pm X 5 mm diameter) was placed inside. The cell was then fitted with a 5 mm pathlength window and purged of air. The cell was heated to ca. 35 °C and then pressurized with CO2 (preheated to ca. 35 °C) to 75 bar. Spectra were recorded at a resolution of 1 cm" over a period of about 1 h.

As shown in Table 12.1 the impact resistance and tensile strength of ultrahigh-molecular weight polyethylene (uhmwpe) are superior to those of HOPE, but UHMWPE is mort difficult to process, uhmwpe is also slightly harder than hope. 

Ultrahigh-molecular-weight polyethylene (UHMWPE) is defined by ATM as polyethylene with molecular weight over three million (weight average). The resin is made by a special Ziegler-type polymerization. 

The wear resistance of zirconia is inferior to that of alumina. In ceramic/ceramic combinations the wear rate of zirconia can be significantly higher than that of alumina. In combination with ultrahigh-molecular-weight polyethylene (UHMWPE) excessive wear of the polymer occurs. 

Ultrahigh molecular weight polyethylene (UHMWPE) 70,000-200,000 approx. 2-6 million... 

Dupont. Technical guide - kevlar aramid fiber, available http //www2dupontcom/Kevlar/ en US/assets/downloads/KEVLAR Technical Guidepdf [accessed September 2012]. Stein HL. Ultrahigh molecular weight polyethylenes (UHMWPE). In Dostal C, editor. Engineered materials handbook, vol. 2, Engineering plastics. Ohio ASM International 1998. p. 167-71. 

Even though CM and TM are used principally with TSs, these processes are sometimes used to mold conventional TPs for short runs with low-cost molds. They also are used with TPs that are difficult to melt, have too short a heat melt range for IM or other processes, and require high pressures. A typical example is ultrahigh molecular weight polyethylene (UHMWPE). 

Eyerer R, A. Frank, and R. Jin. 1985. Characterization of ultrahigh molecular weight polyethylene (UHMWPE) Extraction and viscometry of UHMWPE. Plastverarbeiter 36 46-54. 

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