Ultrahigh-molecular-weight polyethylene (UHMW-PE) can be drawn even from the molten state owing to its high melt viscosity. Molten UHMW-PE exhibits elastic deformability, which is homogeneously transmitted within entire sample through molecular entanglements, resulting in oriented crystallization. Thus, entanglement characteristics are a dominant factor for drawability of UHMW-PE. The reactor p...

The biochemical reaction during the formation of lubricant film in case a cobalt-chromium ball on an ultrahigh-molecular weight polyethylene cup was studied. Three types model synovial fluids and hyaluronic acid (HA) at physiologic concentrations were used experiment. coefficient friction measured using pendulum hip simulator, Raman spectroscopy to perceive chemical reactions between fluid impl...

a fi zr-based catalyst of bis[n-(3,5-dicumylsalicylidene)-2′,6′­diisopropylanilinato]zirconium(iv) dichloride was prepared and used for polymerization of ethylene. the effects of reaction conditions on the polymerization were examined in detail. the increase in ethylene pressure and rise in polymerization temperature up to 35 oc were favorable for catalyst/mao to raise the catalytic activity as...

The effect of counterface roughness on the wear of conventional gamma-sterilized, and electron-beam-crosslinked ultrahigh molecular weight polyethylene was studied with a circularly translating pin-on-disk device. The counterfaces, CoCr disks, were either polished, or roughened so that they represented the type of roughening and the range of surface roughness values (R(a) = 0.014-0.24 microm) o...