Investigating the Effect of Extrusion Processing of Polyethylenes on their Molecular Weight and Physicomechanical Characteristics

Abstract

An investigation was made of the process of extrusion processing of linear low-density polyethylene (LLDPE) (CEB-1 and CEH-1) and high-density polyethylene (HDPE) with the aim of studying the effect of a change in their fractional composition on the properties of articles. The investigation of the effect of the extrusion processing of linear low-density polyethylene (LLDPE) is a little investigated area in the processing of polyolefins. Such investigations are also of practical interest for the processing of base large-tonnage polyolefins. This is connected with the complexity of processing polyolefins on plasticising extruders [1-4].

The Rheological Behaviour of Prooxidants Based on Iron Stearate

“…During processing of polyethylenes, the molecular weight distribution changes as a result of mechanochemical processes. Abbasov et al [8] showed that a certain improvement in the strength properties of specimens after extrusion is observed after first-time extrusion; after re-extrusion of the same polyethylene specimen, no increase in its physicomechanical properties is observed. With multiple extrusion, degradation processes are intensified, which ultimately promotes the build-up of lowmolecular-weight fractions, including oxygen-containing reactive groups, and consequently a reduction in the physicomechanical properties of the polyethylene.…”