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A macromolecular deformation model to estimate viscoelastic flow effects in polymer melts
Author(s) -
Porter David
Publication year - 1993
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.760330710
Subject(s) - materials science , viscoelasticity , polymer , die swell , deformation (meteorology) , swell , viscosity , shear rate , brittleness , rheology , flow (mathematics) , composite material , newtonian fluid , thermodynamics , mechanics , extrusion , physics
The elastic deformation of polymer macromolecules in a shear field is used as the basis for quantitative predictions of viscoelastic flow effects in a polymer melt. Non‐Newtonian viscosity, capillary end correction factor, maximum die swell, and die swell profile of a polymer melt are predicted by the model. All these effects can be reduced to generic master curves, which are independent of polymer type. Macromolecular deformation also influences the brittle failure strength of a processed polymer glass. The model gives simple and accurate estimates of practically important processing effects, and uses fitting parameters with the clear physical identity of viscoelastic constants, which follow well established trends with respect to changes in polymer composition or processing conditions.