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Glass fiber‐filled thermoplastics. I. Wall and processing effects on rheological properties
Author(s) -
Chung Bin,
Cohen Claude
Publication year - 1985
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.760251603
Subject(s) - materials science , composite material , extrusion , rheology , polypropylene , shear rate , glass fiber , polystyrene , breakage , viscosity , shear (geology) , polymer , apparent viscosity
A systematic study of wall effects on the shear viscosity of short glass fiber‐filled polypropylene and polystyrene is presented. The dependence of these effects on capillary radius, shear rate, temperature, and polymer matrix is examined. The “true” viscosity curves of these materials (free from wall effects) can be obtained by an extrapolation procedure. Breakage of glass fibers in the high shear‐rate processes of extrusion and injection molding lead to an appreciable reduction of the viscosity of these materials and is probably the more important effect to take into account in these processes.