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Abstract:
Rheology is a powerful tool that can be
used to relate polyolefin rheological behavior
to molecular structure and, furthermore, to “fingerprint”
polyolefin behavior during processing. This presentation
will demonstrate the power of rheology in polyolefin
characterization. In particular, extensional flow
measurements generate highly directional flow
fields that are very sensitive to the molecular
structure of a polymeric system. In one case,
extensional flow and peel results in the melt
state provide insight into the origins and mechanisms
of flow instabilities such as melt fracture. Shear
rheology (linear viscoelasticity) is also a useful
tool for studying structure-property relationships.
Finally, capillary rheology can be utilized to
study polyolefin idiosyncrasies in processing.
A surprising example will be presented: capillary
rheology was able to detect the presence of long-chain
branching, whereas shear and extensional rheology
could not.
Presenter:
Savvas
G. Hatzikiriakos, University of British Columbia
Savvas G. Hatzikiriakos obtained his diploma
in chemical engineering from the Aristotelean
University of Thessaloniki (1983), his M.A.Sc.
in chemical engineering from the University of
Toronto (1988), and his Ph.D. in chemical engineering
from McGill University. Since 1991 he has been
a professor in the Department of Chemical Engineering
at the University of British Columbia. His main
research interests are in applied polymer rheology
and in polymer processing with emphasis on solving
practical problems through the use of rheological
techniques. He has published over 150 technical
papers on polymer rheology and polymer processing,
and he is the co-author of five patents and one
book on polymer-processing instabilities.
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