Polyethylene Ultra High Molecular Weight
Polyethylene of ultra high molecular weight (PE-UHMW) has very long molecular chains. It is a polyethylene with an extremely high molecular weight of more than 1 mio. g/mol; the mean molar mass is approx. 6 mio. g/mol. Wear resistance and impact strength, in particular, improve with increasing length of the polymer chains.
|DSC 204 F1 Phoenix®
|IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phases
|20 min/2 min/20 min
|Al, pierced lid
|N2 (40 ml/min)
Like all polyethylenes, PE-UHMW is a semi-crystalline thermoplastic. The example shown exhibited a Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.glass transition at -122°C (with a very small change in specific heat of 0.03 J/(g·K)) only in the 2nd heating (red curve). The present sample was not granular. Rather, it was but a fine powder. Due to SinteringSintering is a production process for forming a mechanically strong body out of a ceramic or metallic powder. sintering of the powder during the 1st heating (blue), the melting effect (peak temperature) shifted by about 10 K to lower temperatures (from 146°C to 135°C) in the 2nd heating (red). The melting enthalpy decreased by approx. 19% from 185 J/g to approx. 150 J/g in the 2nd heating.