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The significance of slip of polymer melt flow
Author(s) -
Westover R. F.
Publication year - 1966
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760060116
Subject(s) - materials science , discontinuity (linguistics) , slip (aerodynamics) , flow (mathematics) , polymer , shear flow , shear (geology) , mechanics , flow properties , composite material , thermodynamics , mathematics , physics , mathematical analysis
Some recent observations of catastrophic yielding or bimodal flow behavior in linear polyethylene melts have indicated certain inadequacies in the commonly accepted flow theories and practices. Examples of some “non‐ideal” behavior are presented along with some evidence that slip at or near the polymer‐die interface, rather than a flow phenomenon, is the mechanism associated with the discontinuity in the flow curve. The discontinuity shear stress is observed to be independent of hydrostatic pressure. The significance of this bimodal flow behavior is related to polymer processing problems.