Worldwide manufacturing polyethylene andconsumption volume represents approximately40% of the total demand of all thermoplasticmaterials and approximately one third of thedemand of the overall plastic material (Fig. 1).With its simple and inexpensive structure,chemical resistance, relatively good physical properties,a density that is lower than that ofmost otherpolymers, and relatively low environmentalimpact, polyethylene is the material of choicefor many applications that span from medicalimplants (ultrahigh-molecular-mass polyethylene,
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