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Rheological Characterization of Long‐chain Branched Polyethylenes and Comparison with Classical Analytical Methods
Author(s) -
Stadler Florian J.,
Piel Christian,
Kaminsky Walter,
Münstedt Helmut
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200690057
Subject(s) - comonomer , rheology , characterization (materials science) , chain (unit) , polymer science , polymer chemistry , polymerization , materials science , chemical engineering , polymer , composite material , nanotechnology , physics , astronomy , engineering
Long‐chain branched polyethylenes are still of great interest today. In some cases their characterization is not an easy task with classical analytic methods (GPC‐MALLS and NMR) because of the limited sensitivity at low concentrations of long‐chain branches. Rheological methods make a valuable contribution to the characterization due to their high sensitivity with respect to long‐chain branches. Using rheology it was possible to get an insight into the influence of different comonomers and comonomer concentrations on the long‐chain branch incorporation in LLDPE. A variation of polymerization parameters such as polymerization pressure was found to influence the rheological behavior. From these findings some conclusions with respect to the molecular structure could be drawn.