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Anomalies in the rheological behavior of polyethylene with very broad molecular weight distribution
Author(s) -
Masson Patrick,
Spitz Roger
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070340401
Subject(s) - rheology , polymer , molar mass distribution , materials science , viscosity , polyethylene , limiting , polymer chemistry , chemical engineering , high density polyethylene , thermodynamics , composite material , mechanical engineering , physics , engineering
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).