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Viscoelastic parameters of characterized branched polyethylenes
Author(s) -
Ram Arie
Publication year - 1977
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.760171106
Subject(s) - viscoelasticity , materials science , branching (polymer chemistry) , polyethylene , composite material , shear (geology) , molar mass distribution , shear rate , die swell , thermodynamics , rheology , polymer , extrusion , physics
Certain steady state viscoelastic parameters, including melt viscosities, normal stress coefficients, and shear compliances, are determined for a series of well‐characterized low, density polyethylene samples, and the results are analyzed. The effects of shear rate, temperature, molecular weight, molecular weight distribution, and the degree of long chain branching are demonstrated. The agreement observed between steady state shear compliance values derived from normal stresses and those obtained from die swell measurements is significant.