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Rheology of short glass fiber‐reinforced thermoplastics and its application to injection molding. II. The effect of material parameters
Author(s) -
Crowson R. J.,
Folkes M. J.
Publication year - 1980
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.760201404
Subject(s) - materials science , composite material , rheology , die swell , molding (decorative) , mold , fiber , shear rate , viscosity , shear (geology) , swell , glass fiber , shear viscosity , extrusion , thermodynamics , physics
The effect of fiber concentration, fiber length, and temperature on the shear viscosity and die swell of several short glass fiber‐filled thermoplastics has been determined. In addition, a study of the injection molding behavior of these materials has been performed. At low shear rates, viscosity increases appreciably with both fiber length and fiber concentration, but at high shear rates the effect is much less pronounced. A qualitative explanation is proposed for these effects in terms of the fiber orientation studies reported in Part I of this paper (1). The die swell is an important parameter in determining the method of mold filling of these materials, and depends strongly on fiber length.