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Influence of Short‐Chain Branching of Polyethylenes on the Temperature Dependence of Rheological Properties in Shear
Author(s) -
Stadler Florian J.,
Gabriel Claus,
Münstedt Helmut
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700267
Subject(s) - branching (polymer chemistry) , comonomer , viscoelasticity , rheology , polyethylene , linear low density polyethylene , activation energy , polymer chemistry , materials science , metallocene , molar mass distribution , shear (geology) , thermodynamics , composite material , chemistry , polymerization , polymer , physics
This contribution describes the influence of short‐chain branching on the temperature dependence of rheological properties of polyethylene (PE) melts in shear. The materials investigated are linear and short‐chain branched, metallocene‐catalyzed PEs of narrow molecular mass distribution. The linear viscoelastic properties are determined by dynamic‐mechanical analysis. Short‐chain branching (SCB) leads to an increase of the flow activation energy. The activation energy was found to increase linearly with rising weight comonomer content.