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Extrusion behavior of filled polymeric systems exhibiting an apparent yield stress
Author(s) -
Poslinski A. J.,
Ryan M. E.,
Gupta R. K.,
Seshadri S. G.,
Frechette F. J.
Publication year - 1988
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.760280708
Subject(s) - materials science , extrusion , viscometer , composite material , ceramic , composite number , viscosity , plastics extrusion , shear rate , capillary action , yield (engineering) , pressure drop , thermodynamics , physics
An investigation was undertaken to study the extrusion behavior of composite systems. A compound made up of approximately 50 percent ceramic particulates by volume dispersed in a high molecular weight thermoplastic polymer was characterized by measuring the shear viscosity on an Instron capillary viscometer. The experimental data indicated that the ceramic composite exhibited an apparent yield stress. As a result, an expression that was previously shown to provide flexibility for describing a yield stress at low rates of deformation could explain the viscosity of the ceramic composite. The expression was then applied to the flow analysis of both a “rod” and a “slit” die in an extrusion process, and the derived equations adequately correlated experimental volumetric flow rate us. Pressure drop data obtained on a laboratory extruder.