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The dependence of viscoelastic flow functions on polymer structure for linear and branched polystyrene and polybutadiene
Author(s) -
Ramachandran S.,
Christiansen E. B.
Publication year - 1985
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690311006
Subject(s) - polybutadiene , viscoelasticity , polystyrene , linear polymer , polymer , molar mass distribution , polymer chemistry , materials science , shear rate , shear flow , shear stress , shear (geology) , thermodynamics , composite material , polymer science , viscosity , physics , copolymer
Experimentally determined viscosities, first and second normal stress differences, and compliances for concentrated solutions of linear and four‐arm star‐branched polystyrenes and polybutadienes depend on the shear rate and the molecular weight, in agreement with theory and previously reported experimental results. The ratios of the second to first normal stress difference are ‐0.29 and ‐0.214 for the linear and branched polymers, respectively, independent of molecular weight, molecular weight distribution, concentration, and shear rate.