Anomalies in the rheological behavior of polyethylene with very broad molecular weight distribution

✍ Scribed by Patrick Masson; Roger Spitz

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 411 KB
• Volume: 34
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1987.070340401

✦ Synopsis

The rheological behavior of high density polyethylenes with very broad molecular weight distribution is studied in the molten state starting from freshly synthesized powders. The complex viscosity increases slowly up to a limiting value as a function of ageing of the polymer and faster when the molten polymer is stirred. The phenomena are explained by an heterogeneous distribution of very high molecular weight nodules in the polymer arising from the synthesis and is proved by the preparation and characterization of polymers presenting the opposite heterogeneity and behavior (very low molecular weight nodules).