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Dynamic rheological behavior of polypropylene melts with pulsatile pressure flow in a dynamic capillary rheometer
Author(s) -
He Guang Jian,
Qu Jin Ping,
Chun Yin Xiao
Publication year - 2006
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.24082
Subject(s) - rheometer , viscoelasticity , materials science , rheology , extrusion , pulsatile flow , polypropylene , composite material , shear rate , viscosity , shear (geology) , vibration , capillary action , shear stress , physics , medicine , cardiology , quantum mechanics
A self‐made dynamic capillary rheometer (DCR) was designed to investigate the dynamic viscoelastic characteristic of polypropylene (PP) melt during the pulsatile pressure extrusion. A vibration force field was parallel superposed upon steady shear flow in this DCR by means of a vibration driven piston. During the pulsatile pressure extruding process in DCR, the PP melt displayed apparent viscoelasticity. The experiment results proved the pressure pulsatile extrusion could reduce the viscosity of polymer melts effectively. The phase difference between the shear stress and the shear rate decreased with the superposed vibration. But, at large amplitude conditions, the viscosity has an increasing tendency. This maybe illuminated that large amplitude could be harmful for the vibration‐assistant polymer processing. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1834–1838, 2006